Halcon一维码识别

文章目录 参数连接halcon 自带案例1（设置校验位识别条码）Halcon 自带案例2（设置对比度识别条码）Halcon 自带案例3（存在曲面变形）Halcon 自带案例4（设置条码扫描线）Halcon 自带案例5（一维码阈值）Halcon Codabar编码案例Halcon Code128编码案例Halcon 符合编码案例Halcon 当条码被遮挡的情况下Halcon 检测条码绘制条码矩形 decode_bar_code_rectangle2halcon 设置条码的高度和宽度案例

参数连接

一维码识别算子

halcon 自带案例1（设置校验位识别条码）

ctrl +e 选择 一维码的第一个案例， set_bar_code_param (BarCodeHandle, ‘check_char’, ‘present\absent’)设置条码是否检查校验位

*check_char 是否验证校验位(present是 absent 否) *composite_code 附加一个二维条码构成"组合码" *element_height_min 最小条码的高度 *element_size_max 条码最大尺寸(宽度和间距) *element_size_min 条码最小尺寸(宽度和间距) *max_diff_orient 相邻边缘方向的最大角度容差 *meas_thresh 用来识别条码边沿，一般取值[0.05,0.2] *meas_thresh_abs *min_identical_scanlines 认定成功解码所需的最少扫描线数，默认为1 *num_scanlines 条码扫描的最大数目 *orientation 条码方向(度) *orientation_tol 条码方向容差(度) *persistence 保存解码的中间结果 *start_stop_tolerance 当检测扫描线的起点和终点图案时，用该语句设置"容许误差" *stop_after_result_num 设置要解码的条码条数 *upce_encodation 用以不同的输出格式(UPC-E码) *timeout 检测超时 *train 训练 *quiet_zone *slanted 对倾斜条码额外处理 * Read bar codes of type 2/5 Industrial *这是创建一个空的条码模型，并将其存储在变量BarCodeHandle中。该模型可以用于设置和调整条码参数。 create_bar_code_model ([], [], BarCodeHandle) * We expect to decode a single bar code per image *此代码行设置读取图像时停止的结果数量。在本例中，我们只需要读取一个条码，因此此参数设置为1。 set_bar_code_param (BarCodeHandle, 'stop_after_result_num', 1) * Some codes show a minimal code length of 1 digit. Hence, we need to decrease the * default setting for this application. *此代码行设置具体条码类型的参数。在本例中，‘2/5 Industrial’条码类型的最小长度被设置为1。 set_bar_code_param_specific (BarCodeHandle, '2/5 Industrial', 'min_code_length', 1) * Note, that this is not recommended in real world applications due to the possibility * of more false reads. dev_close_window () dev_open_window (0, 0, 120, 300, 'black', WindowHandle) set_display_font (WindowHandle, 14, 'mono', 'true', 'false') dev_set_draw ('margin') dev_set_line_width (3) for I := 1 to 4 by 1 read_image (Image, 'barcode/25industrial/25industrial0' + I) get_image_size (Image, Width, Height) dev_set_window_extents (0, 0, Width - 1, Height - 1) dev_display (Image) dev_set_color ('green') * Read bar code, the resulting string includes the check character *不检查校验位的情况 *设置条码参数，不检查校验位。 set_bar_code_param (BarCodeHandle, 'check_char', 'absent') *寻找图像中的条码，并将解码结果存储在变量DecodedDataStrings中。此处使用了'2/5 Industrial'条码类型。 find_bar_code (Image, SymbolRegions, BarCodeHandle, '2/5 Industrial', DecodedDataStrings) *在窗口中显示解码结果，颜色为黑色。 disp_message (WindowHandle, DecodedDataStrings, 'window', 12, 12, 'black', 'false') *获取解码结果的长度，并将其存储在变量LastChar中。 LastChar := strlen(DecodedDataStrings) - 1 *在窗口中显示解码结果的最后一个字符，并将其颜色设置为森林绿。 disp_message (WindowHandle, sum(gen_tuple_const(LastChar,' ')) + DecodedDataStrings{LastChar}, 'window', 12, 12, 'forest green', 'false') stop () * Read bar code using the check character to check the result, i.e., * the check character does not belong to the returned string anymore. * If the check character is not correct, the bar code reading fails dev_set_color ('green') *检查校验位的情况 *设置条码参数，检查校验位 set_bar_code_param (BarCodeHandle, 'check_char', 'present') *再次寻找图像中的条码，并将解码结果存储在变量DecodedDataStrings中。此处同样使用了'2/5 Industrial'条码类型。 find_bar_code (Image, SymbolRegions, BarCodeHandle, '2/5 Industrial', DecodedDataStrings) *在窗口中显示重新解码得到的结果，颜色为黑色。 disp_message (WindowHandle, DecodedDataStrings, 'window', 36, 12, 'black', 'false') dev_set_color ('magenta') if (I < 4) stop () endif endfor Halcon 自带案例2（设置对比度识别条码）

设置条码的对比度来减少运行的时间增加正确性，通过改变set_bar_code_param (BarCodeHandle, ‘contrast_min’, ContrastMinValue) 的值设置对比度计算时间，并且增加识别的正确率 ContrastMinValue :=0的的情况下识别到一维码的个数

* Example program for the usage of the bar code parameter * 'contrast_min'. * * This parameter can be used to reduce the runtime of find_bar_code * in the presence of a low contrast bar-like structures in an image. * Moreover 'contrast_min' can also be used to reduce the number of * false positives if the expected barcodes have high contrast. * * Create bar code reader model create_bar_code_model ([], [], BarCodeHandle) * * Initialization dev_update_off () dev_close_window () * * Read and display example images without any visible bar codes read_image (Image, 'barcode/25interleaved/25interleaved_zeiss1') * * Set display defaults dev_open_window_fit_image (Image, 0, 0, 600, 500, WindowHandle) dev_display (Image) dev_set_draw ('margin') set_display_font (WindowHandle, 14, 'mono', 'true', 'false') get_window_extents (WindowHandle, Row, Column, Width, Height) dev_open_window (0, Width + 5, 400, 300, 'white', WindowHandleText) set_display_font (WindowHandleText, 14, 'mono', 'true', 'false') * * Display information about the example Message[0] := 'This example demonstrates the use of the bar code parameter \'contrast_min\'.' Message[1] := ' ' Message[2] := 'The parameter \'contrast_min\' can be used to reduce the runtime of find_bar_code in the presence of low contrast bar-like structures in an image. Moreover \'contrast_min\' can also be used to reduce the number of false positives in applications where the expected barcodes have a high contrast.' MessageWrapped := regexp_replace(Message + ' ',['(.{0,35})\\s','replace_all'],'$1\n') disp_message (WindowHandleText, MessageWrapped, 'window', 12, 12, 'black', 'false') disp_continue_message (WindowHandle, 'black', 'true') stop () dev_set_window (WindowHandle) dev_clear_window () dev_display (Image) * 首先将'contrast_min'参数设置为默认值0，并执行find_bar_code函数，记录运行时间 * Number of repetitions for runtime measurements(运行时测量的次数) NumRepeat := 100 * * First, set the minimum contrast of the bar code candidate regions * to 0 (default) ContrastMinValue := 0 *set_bar_code_param (条形码读取器模型的句柄, 要设置的参数名称, 参数的值) set_bar_code_param (BarCodeHandle, 'contrast_min', ContrastMinValue) * * The bar code reader finds many bar code candidate regions that have * a low absolute contrast Times := [] for I := 0 to NumRepeat by 1 count_seconds (Start) *查找条形码 find_bar_code (Image, SymbolRegions, BarCodeHandle, '2/5 Interleaved', DecodedDataStrings) count_seconds (End) Time := End - Start Times := [Times,Time] endfor RunTimeContrastMinLow := 1000 * median(Times) * Get candidate regions and display results(选取区域并显示结果) *访问在条码符号搜索或解码过程中创建的标志性对象。 get_bar_code_object (BarCodeObjects, BarCodeHandle, 'all', 'candidate_regions') count_obj (BarCodeObjects, Number) dev_set_color ('red') dev_set_line_width (5) dev_display (BarCodeObjects) dev_set_window (WindowHandleText) dev_clear_window () Message := ['\'contrast_min\' = ' + ContrastMinValue + ':',' Found ' + Number + ' candidate(s) in ' + (RunTimeContrastMinLow$'.4') + ' ms'] disp_message (WindowHandleText, Message, 'window', 12, 12, '', 'false') * * Now, set the bar code reader parameter 'contrast_min' to a value * greater than 0.0 to consider only candidates having an absolute * contrast of at least that value. *将'contrast_min'参数设置为大于0的值，并再次执行find_bar_code函数，记录运行时间： ContrastMinValue := 120 set_bar_code_param (BarCodeHandle, 'contrast_min', ContrastMinValue) * * Search again for bar codes. Now, a significantly smaller number of * candidates should be found, and the overall runtime should be reduced. Times := [] for I := 0 to NumRepeat by 1 count_seconds (Start) find_bar_code (Image, SymbolRegions, BarCodeHandle, '2/5 Interleaved', DecodedDataStrings) count_seconds (End) Time := End - Start Times := [Times,Time] endfor RunTimeContrastMinHigh := 1000 * median(Times) * Get candidate regions and display results dev_set_window (WindowHandle) get_bar_code_object (BarCodeObjects, BarCodeHandle, 'all', 'candidate_regions') count_obj (BarCodeObjects, Number) dev_set_color ('forest green') dev_set_line_width (3) dev_display (BarCodeObjects) smallest_rectangle1 (SymbolRegions, Row1, Column1, Row2, Column2) get_bar_code_result (BarCodeHandle, 'all', 'decoded_types', DecodedTypes) disp_message (WindowHandle, DecodedTypes + '\n' + DecodedDataStrings, 'image', Row1, Column2 + 20, 'black', 'true') dev_set_window (WindowHandleText) Message := ['\'contrast_min\' = ' + ContrastMinValue + ':',' Found ' + Number + ' candidate(s) in ' + (RunTimeContrastMinHigh$'.4') + ' ms'] disp_message (WindowHandleText, Message, 'window', 62, 12, 'forest green', 'false') Message := 'Setting \'contrast_min\' to a higher value typically results in a faster execution and in fewer false positives.' MessageWrapped := regexp_replace(Message + ' ',['(.{0,35})\\s','replace_all'],'$1\n') disp_message (WindowHandleText, MessageWrapped, 'window', 122, 12, 'black', 'false') Halcon 自带案例3（存在曲面变形）

分别设置set_bar_code_param (BarCodeHandle, ‘element_size_variable’, ‘false\true’) 对于条形码不变形的情况下element_size_variable的情况 条形码扭曲变形的情况下

* This example demonstrates how to use the bar code parameter * 'element_size_variable' if surface deformations are present. * * To illustrate the effect of the parameter, both decoding results * are shown in contrast. It is shown that, under cylindrical * surface deformation, setting the bar code parameter to 'true' * will lead to successful decoding. * **************************************************************** * * Initialization dev_update_off () dev_close_window () * * Create two bar code model with different element_size_variable values create_bar_code_model ([], [], BarCodeHandle) set_bar_code_param (BarCodeHandle, 'element_size_variable', 'false') create_bar_code_model ([], [], BarCodeHandleVarSize) set_bar_code_param (BarCodeHandleVarSize, 'element_size_variable', 'true') CodeTypes := ['GS1 DataBar Limited','GS1 DataBar Expanded','GS1 DataBar Expanded Stacked'] * * Prepare graphics window read_image (Image, 'barcode/gs1databar_limited/gs1databar_limited_no_deform') dev_open_window_fit_image (Image, 0, 0, -1, -1, WindowHandle) set_display_font (WindowHandle, 16, 'mono', 'true', 'false') * * Define bar code region DecodeRectRow := 315 DecodeRectColumn := 490 DecodeRectPhi := 0 DecodeRectLength1 := 410 DecodeRectLength2 := 200 * * Part 1 * Read bar code without distortions * * Decode the bar code with default setting decode_bar_code_rectangle2 (Image, BarCodeHandle, CodeTypes, DecodeRectRow, DecodeRectColumn, DecodeRectPhi, DecodeRectLength1, DecodeRectLength2, DecodedDataStrings) get_bar_code_object (SymbolRegions, BarCodeHandle, 'all', 'symbol_regions') * * Allow variable element sizes ('element_size_variable' = 'true') decode_bar_code_rectangle2 (Image, BarCodeHandleVarSize, CodeTypes, DecodeRectRow, DecodeRectColumn, DecodeRectPhi, DecodeRectLength1, DecodeRectLength2, DecodedDataStringsVarSize) get_bar_code_object (SymbolRegionsVarSize, BarCodeHandleVarSize, 'all', 'symbol_regions') * * Display results Message := 'If the bar code is not deformed, it is found with default settings.' Message[1] := 'Setting \'element_size_variable\' to \'true\' is not necessary.' display_results (Image, SymbolRegions, SymbolRegionsVarSize, WindowHandle, DecodedDataStrings, DecodedDataStringsVarSize, Message) disp_continue_message (WindowHandle, 'black', 'true') stop () * * Part 2 * Read distorted bar code * read_image (Image, 'barcode/gs1databar_limited/gs1databar_limited_cylinder') * * Use default setting decode_bar_code_rectangle2 (Image, BarCodeHandle, CodeTypes, DecodeRectRow, DecodeRectColumn, DecodeRectPhi, DecodeRectLength1, DecodeRectLength2, DecodedDataStrings) get_bar_code_object (SymbolRegions, BarCodeHandle, 'all', 'symbol_regions') * Use 'element_size_variable' = 'true' decode_bar_code_rectangle2 (Image, BarCodeHandleVarSize, CodeTypes, DecodeRectRow, DecodeRectColumn, DecodeRectPhi, DecodeRectLength1, DecodeRectLength2, DecodedDataStringsVarSize) get_bar_code_object (SymbolRegionsVarSize, BarCodeHandleVarSize, 'all', 'symbol_regions') * * Display results Message := 'If the bar code is bended, the code will only be read with' Message[1] := '\'element_size_variable\' set to \'true\'.' display_results (Image, SymbolRegions, SymbolRegionsVarSize, WindowHandle, DecodedDataStrings, DecodedDataStringsVarSize, Message) Halcon 自带案例4（设置条码扫描线）

设置扫描线set_bar_code_param (BarCodeHandle, ‘majority_voting’, MajorityVotingSetting) 当MajorityVotingSetting为false的情况 当MajorityVotingSetting为true的情况

* This example program shows the effect of the bar code * parameter 'majority_voting'. * * The bar code reader analyses multiple scanlines and tries * to decode them. By default, this process is terminated as soon * as one scanline can be decoded successfully. In some cases, * the result derived from this scanline may be wrong due to * local printing errors. * * If the parameter 'majority_voting' is set to 'true', all * scanlines are analysed. The final reading result is then * determined by a majority voting of all successful decoding * results. * * Prepare visualization settings and objects dev_update_off () dev_close_window () read_image (Image, 'barcode/ean13/ean13_label') get_image_size (Image, WidthI, HeightI) dev_open_window_fit_image (Image, 0, 0, 600, 500, WindowHandle) dev_display (Image) dev_set_draw ('margin') set_display_font (WindowHandle, 14, 'mono', 'true', 'false') get_window_extents (WindowHandle, Row, Column, Width, Height) WindowZoomFactor := real(WidthI) / Width dev_open_window (0, Width + 5, 400, 300, 'white', WindowHandleText) set_display_font (WindowHandleText, 14, 'mono', 'true', 'false') * * Create bar code reader model create_bar_code_model ([], [], BarCodeHandle) * * PART I, read bar code without majority voting MajorityVotingSetting := 'false' set_bar_code_param (BarCodeHandle, 'majority_voting', MajorityVotingSetting) * 持久性模型设置 set_bar_code_param (BarCodeHandle, 'persistence', 1) * 定义条码阈值 set_bar_code_param (BarCodeHandle, 'meas_thresh', 0.1) * 防止'meas_thresh'参数出现错误检测 set_bar_code_param (BarCodeHandle, 'meas_thresh_abs', 30) * * Perform decoding and prepare results dev_set_window (WindowHandle) * 直接扫描所提供的区域以寻找条形码 decode_bar_code_rectangle2 (Image, BarCodeHandle, 'EAN-13', 280, 223, 3.14125 / 2.0, 200, 50, DecodedDataStrings) *得到解码区域 get_bar_code_object (SymbolRegion, BarCodeHandle, 'all', 'symbol_regions') *得到解码类型 get_bar_code_result (BarCodeHandle, 'all', 'decoded_types', DecodedTypes) *得到解析条码的字符串结果 get_bar_code_result (BarCodeHandle, 'all', 'decoded_strings', DecodedData) *访问在条码符号搜索或解码过程中创建的标志性对象 get_bar_code_object (ValidScanlines, BarCodeHandle, 'all', 'scanlines_valid') get_majority_voting_example_symbols (SymbolRegion, ValidScanlines, DecodedData, BarCodeHandle, DecodedTypes, DecodedData) * 选中某一个连通域 select_obj (ValidScanlines, FirstScanline, 5) * * Display results and labels disp_message (WindowHandle, ['Looking for bar codes','\'majority_voting\' = \'' + MajorityVotingSetting + '\''], 'window', 12, 12, 'black', 'true') ColorsText := ['forest green','red'] dev_set_line_width (2) smallest_rectangle1 (SymbolRegion, Row1, Column1, Row2, Column2) dev_set_color ('red') dev_display (SymbolRegion) dev_display (FirstScanline) * Message := ['Codetype: ','Data: '] + [DecodedTypes,DecodedData] disp_message (WindowHandle, Message, 'image', Row1 - 40 * WindowZoomFactor, Column2 - 100, ColorsText[1], 'true') * * Display description Message := 'By default \'majority_voting\' is set to \'false\'.' Message[1] := ' ' Message[2] := 'If the parameter \'majority_voting\' is set to \'false\', the reading result is set to the decoding result of the first scanline that could be decoded.' Message[3] := ' ' Message[4] := 'Here, an \'EAN-13\' code is detected wrongly inside of another \'EAN-13\' because of a printing error.' MessageWrapped := regexp_replace(Message + ' ',['(.{0,35})\\s','replace_all'],'$1\n') disp_message (WindowHandleText, MessageWrapped, 'window', 12, 12, 'black', 'false') disp_continue_message (WindowHandle, 'black', 'true') stop () * * PART II, enable majority voting * MajorityVotingSetting := 'true' set_bar_code_param (BarCodeHandle, 'majority_voting', MajorityVotingSetting) * * Perform decoding and prepare results decode_bar_code_rectangle2 (Image, BarCodeHandle, 'EAN-13', 280, 223, 3.14125 / 2.0, 200, 50, DecodedDataStrings) get_bar_code_object (SymbolRegion, BarCodeHandle, 'all', 'symbol_regions') get_bar_code_result (BarCodeHandle, 'all', 'decoded_types', DecodedTypes) get_bar_code_result (BarCodeHandle, 'all', 'decoded_strings', DecodedData) get_bar_code_object (ValidScanlines, BarCodeHandle, 'all', 'scanlines_valid') * 选取 1-4,6,7根线 select_obj (ValidScanlines, MajorityScanlines, [[1:4],6,7]) * * Display results and labels dev_display (Image) disp_message (WindowHandle, ['Looking for bar codes','\'majority_voting\' = \'' + MajorityVotingSetting + '\''], 'window', 12, 12, 'black', 'true') dev_set_draw ('margin') dev_set_color ('green') dev_set_line_width (2) smallest_rectangle1 (SymbolRegion, Row1, Column1, Row2, Column2) dev_display (SymbolRegion) dev_display (MajorityScanlines) Message := ['Codetype: ','Data: '] + [DecodedTypes,DecodedData] disp_message (WindowHandle, Message, 'image', Row1 - 40 * WindowZoomFactor, Column2 - 100, 'forest green', 'true') * * Display description dev_set_window (WindowHandleText) Message := 'If majority voting is enabled, the bar code reader uses a majority voting scheme to determine the reading results. It returns the result that has been decoded from the majority of all scanlines.' Message[1] := ' ' Message[2] := 'Here, the correct \'EAN-13\' code is found.' MessageWrapped := regexp_replace(Message + ' ',['(.{0,35})\\s','replace_all'],'$1\n') dev_clear_window () disp_message (WindowHandleText, MessageWrapped, 'window', 12, 12, 'black', 'false') Halcon 自带案例5（一维码阈值）

通过改变set_bar_code_param (BarCodeHandle, ‘meas_thresh_abs’, MeasThreshAbsValue) 的阈值来提高识别的准确度

* Example program for the usage of the bar code parameter * 'meas_thresh_abs'. * This parameter can be used to reduce the number of false * positives when finding bar code symbol regions which we expect * to have a high contrast. To artificially demonstrate this we * try to find the bar code type PharmaCode that has no check * character and therefore is recognized very easily within * noise. As 'noise' we use images that do not contain any bar * codes at all. * By using 'meas_thresh_abs' with a value greater than 0.0 we * force the bar code reader to use only the parts of a scanline * with an absolute contrast of at least that value and thus * reduce the number of false positives. * * Create bar code reader model create_bar_code_model ([], [], BarCodeHandle) * * Initialization dev_update_var ('off') dev_update_pc ('off') dev_update_window ('off') dev_close_window () dev_open_window (0, 0, 512, 512, 'black', WindowHandle) set_display_font (WindowHandle, 14, 'mono', 'true', 'false') dev_set_draw ('margin') dev_set_line_width (3) * * Read and display example images without any visible bar codes ExampleImages := ['zeiss1','patras','fabrik'] for Index := 0 to |ExampleImages| - 1 by 1 FileName := ExampleImages[Index] read_image (Image, FileName) rgb1_to_gray (Image, Image) * * Set display defaults get_image_size (Image, Width, Height) dev_set_window_extents (-1, -1, Width, Height) dev_display (Image) * * First, disable absolute thresholds by setting the value 0.0 * for the parameter 'meas_thresh_abs' MeasThreshAbsValue := 0.0 set_bar_code_param (BarCodeHandle, 'meas_thresh_abs', MeasThreshAbsValue) * * The bar code reader finds many (wrong) potential bar codes using * scanlines that have a low absolute contrast find_bar_code (Image, SymbolRegions, BarCodeHandle, 'PharmaCode', DecodedDataStrings) dev_set_color ('red') dev_display (SymbolRegions) disp_message (WindowHandle, ['Found ' + |DecodedDataStrings| + ' potential bar codes',' with parameter meas_thresh_abs = ' + MeasThreshAbsValue], 'window', 12, 12, '', 'true') disp_continue_message (WindowHandle, 'black', 'true') stop () * * Now, set the bar code reader parameter 'meas_thresh_abs' to a value * greater than 0.0 to use only parts of a scanline having an absolute * contrast of at least that value. MeasThreshAbsValue := 10.0 set_bar_code_param (BarCodeHandle, 'meas_thresh_abs', MeasThreshAbsValue) * * Look again for a bar code. Now, significant less scanlines should be found. find_bar_code (Image, SymbolRegions, BarCodeHandle, 'PharmaCode', DecodedDataStrings) dev_set_color ('lime green') dev_display (SymbolRegions) disp_message (WindowHandle, ['Found ' + |DecodedDataStrings| + ' potential bar codes',' with parameter meas_thresh_abs = ' + MeasThreshAbsValue], 'window', 5 * 12, 12, '', 'true') disp_continue_message (WindowHandle, 'black', 'true') stop () endfor

阈值为0 阈值为10

Halcon Codabar编码案例

find_bar_code (Image, SymbolRegions, BarCodeHandle, ‘Codabar’, DecodedDataStrings)

* Read bar codes of type Codabar * create_bar_code_model ([], [], BarCodeHandle) * We expect to decode a single bar code per image set_bar_code_param (BarCodeHandle, 'stop_after_result_num', 1) dev_close_window () dev_open_window (0, 0, 120, 300, 'black', WindowHandle) dev_set_color ('green') dev_set_draw ('margin') dev_set_line_width (3) set_display_font (WindowHandle, 14, 'mono', 'true', 'false') for I := 1 to 6 by 1 read_image (Image, 'barcode/codabar/codabar' + (I$'.2')) get_image_size (Image, Width, Height) dev_set_window_extents (0, 0, Width - 1, Height - 1) dev_display (Image) set_bar_code_param (BarCodeHandle, 'check_char', 'present') find_bar_code (Image, SymbolRegions, BarCodeHandle, 'Codabar', DecodedDataStrings) disp_message (WindowHandle, DecodedDataStrings, 'window', 12, 12, 'black', 'false') LastChar := strlen(DecodedDataStrings) - 1 disp_message (WindowHandle, DecodedDataStrings{0} + sum(gen_tuple_const(LastChar - 1,' ')) + DecodedDataStrings{LastChar}, 'window', 12, 12, 'forest green', 'false') if (I < 6) stop () endif endfor Halcon Code128编码案例

find_bar_code (Image, SymbolRegions, BarCodeHandle, ‘Code 128’, DecodedDataStrings) 改变的参数

* Read bar codes of type Code 128 * create_bar_code_model ([], [], BarCodeHandle) dev_close_window () dev_open_window (0, 0, 600, 600, 'black', WindowHandle) set_display_font (WindowHandle, 16, 'mono', 'true', 'false') dev_set_draw ('margin') dev_set_color ('green') dev_set_line_width (3) for I := 1 to 3 by 1 read_image (Image, 'barcode/code128/code128' + (I$'.2')) dev_resize_window_fit_image (Image, 0, 0, -1, -1) find_bar_code (Image, SymbolRegions, BarCodeHandle, 'Code 128', DecodedDataStrings) get_bar_code_result (BarCodeHandle, 0, 'decoded_reference', Reference) String := '' for J := 0 to strlen(DecodedDataStrings) - 1 by 1 if (ord(DecodedDataStrings{J}) < 32) Char := '\\x' + ord(DecodedDataStrings{J})$'02x' else Char := DecodedDataStrings{J} endif String := String + Char endfor disp_message (WindowHandle, String, 'window', 12, 12, 'black', 'true') if (I < 3) disp_continue_message (WindowHandle, 'black', 'true') stop () endif endfor Halcon 符合编码案例

set_bar_code_param (BarCodeHandle, ‘composite_code’, ‘CC-A/B’) 设置为复合码

* * This program demonstrates the decoding of GS1 DataBar bar * codes with Composite component * dev_close_window () dev_open_window (0, 0, 512, 512, 'black', WindowHandle) set_display_font (WindowHandle, 14, 'mono', 'true', 'false') * ScaleWindow := 1.0 * dev_set_draw ('margin') dev_set_color ('green') dev_set_line_width (3) * create_bar_code_model ([], [], BarCodeHandle) set_bar_code_param (BarCodeHandle, 'composite_code', 'CC-A/B') * set_bar_code_param (BarCodeHandle, 'element_size_min', 1.5) * TestParams := [] TestParams := [TestParams,'gs1databar_stacked_composite_01','GS1 DataBar Stacked'] TestParams := [TestParams,'gs1databar_limited_composite_01','GS1 DataBar Limited'] TestParams := [TestParams,'gs1databar_limited_composite_02','GS1 DataBar Limited'] TestParams := [TestParams,'gs1databar_expanded_composite_01','GS1 DataBar Expanded'] * * for I := 0 to |TestParams| - 2 by 2 File := 'barcode/gs1databar_composite/' + TestParams[I] CodeType := TestParams[I + 1] * read_image (Image, File) get_image_size (Image, Width, Height) dev_set_window_extents (0, 0, ScaleWindow * Width, ScaleWindow * Height) disp_message (WindowHandle, 'Barcode Type: ' + CodeType, 'window', 12, 12, 'black', 'true') * find_bar_code (Image, SymbolRegions, BarCodeHandle, CodeType, DecodedDataStrings) * get_bar_code_result (BarCodeHandle, 'all', 'decoded_strings', DecodedStrings) get_bar_code_result (BarCodeHandle, 'all', 'composite_strings', CompositeStrings) disp_message (WindowHandle, DecodedStrings + '\nComposite: ' + CompositeStrings, 'image', 36, 12, 'black', 'true') if (I < |TestParams| - 2) disp_continue_message (WindowHandle, 'black', 'true') stop () endif endfor Halcon 当条码被遮挡的情况下

* * This program demonstrates visualization of bar code scanlines. * This visualization can be used to inspect the quality of images, where * occlusions or print defects might prevent the bar code reader from * successfully decoding the underlying bar code. * * With 'scanlines_all' all scanlines that the bar code reader would * eventually use to decode a candidate bar code (here, colored in red). * With 'scanlines_valid' are visualized all scanlines that can be decoded * as well (here, colored in green) * dev_update_off () dev_close_window () dev_open_window (0, 0, 512, 512, 'black', WindowHandle) set_display_font (WindowHandle, 16, 'mono', 'true', 'false') dev_set_draw ('margin') * Files := ['ean1314','ean1313','ean13_defect_05'] Color := ['magenta','red','green','yellow'] * create_bar_code_model ([], [], BarCodeHandle) set_bar_code_param (BarCodeHandle, 'persistence', 1) * for I := 0 to |Files| - 1 by 1 Filename := 'barcode/ean13/' + Files[I] * read_image (Image, Filename) get_image_size (Image, Width, Height) dev_set_window_extents (0, 0, Width, Height) dev_display (Image) * find_bar_code (Image, SymbolRegions, BarCodeHandle, 'EAN-13', DecodedDataStrings) * Display only scanlines of the decoded candidate region. if (|DecodedDataStrings|) CandidateIds := [0:|DecodedDataStrings| - 1] else CandidateIds := 'all' endif * get_bar_code_object (Candidates, BarCodeHandle, CandidateIds, 'candidate_regions') dev_set_line_width (4) dev_set_color (Color[0]) dev_display (Candidates) * 获取所有扫描线对象（红色） get_bar_code_object (AllScanlines, BarCodeHandle, CandidateIds, 'scanlines_all') dev_set_color (Color[1]) dev_display (AllScanlines) * 获取有效的扫描线对象（绿色） get_bar_code_object (ValidScanlines, BarCodeHandle, CandidateIds, 'scanlines_valid') dev_set_line_width (2) dev_set_color (Color[2]) dev_display (ValidScanlines) * 获取边缘的扫描线对象（黄色） get_bar_code_object (MergedScanlines, BarCodeHandle, CandidateIds, 'scanlines_merged_edges') dev_set_color (Color[3]) dev_display (MergedScanlines) * disp_message (WindowHandle, 'Decoded data string: ' + DecodedDataStrings, 'window', 12, 12, 'black', 'true') disp_message (WindowHandle, ['Candidate region','Extracted scanlines','Valid scanlines','Edges used for merging'], 'window', 42, 12, Color, ['black','false']) if (I < |Files| - 1) disp_continue_message (WindowHandle, 'black', 'true') stop () endif endfor

主要代码

* 获取候选条形码区域的对象 get_bar_code_object (Candidates, BarCodeHandle, CandidateIds, 'candidate_regions') dev_set_line_width (4) dev_set_color (Color[0]) dev_display (Candidates) * 获取所有扫描线对象（红色） get_bar_code_object (AllScanlines, BarCodeHandle, CandidateIds, 'scanlines_all') dev_set_color (Color[1]) dev_display (AllScanlines) * 获取有效的扫描线对象（绿色） get_bar_code_object (ValidScanlines, BarCodeHandle, CandidateIds, 'scanlines_valid') dev_set_line_width (2) dev_set_color (Color[2]) dev_display (ValidScanlines) * 获取边缘的扫描线对象（黄色） get_bar_code_object (MergedScanlines, BarCodeHandle, CandidateIds, 'scanlines_merged_edges') dev_set_color (Color[3]) dev_display (MergedScanlines) Halcon 检测条码绘制条码矩形 decode_bar_code_rectangle2 * This example demonstrates how to use the operator * decode_bar_code_rectangle2. * The bar code region is extracted by simple segmentation * and the returned rectangle2 parameters are passed to * the operator decode_bar_code_rectangle2. * * Initialize variables Directory := 'barcode/ean13/' TeaBoxRegExp := '.*tea_box.*' * * Initialize settings dev_update_window ('off') dev_set_draw ('margin') * * Get list of tea_box*-image files list_image_files (Directory, 'default', [], ImageFiles) ImageFilesTea := regexp_select(ImageFiles,[TeaBoxRegExp,'ignore_case']) read_image (Image, ImageFilesTea[0]) * * Prepare graphics window and bar code model dev_close_window () dev_open_window_fit_image (Image, 0, 0, -1, -1, WindowHandle) set_display_font (WindowHandle, 14, 'mono', 'true', 'false') dev_set_line_width (2) create_bar_code_model ([], [], BarCodeHandle) * * Decode tea_box*-images for ImageIndex := 0 to |ImageFilesTea| - 1 by 1 read_image (Image, ImageFilesTea[ImageIndex]) dev_display (Image) * * segment and determine the bar code region threshold (Image, RegionThresh, 56, 255) connection (RegionThresh, RegThreshConn) select_shape_std (RegThreshConn, RegionBC, 'max_area', 100) * * create input parameters for decode_bar_code_rectangle2 smallest_rectangle2 (RegionBC, Row, Column, Phi, Length1, Length2) gen_rectangle2 (Rectangle2BC, Row, Column, Phi, Length1, Length2) dev_set_color ('magenta') dev_display (Rectangle2BC) * * decode_bar_code_rectangle2 directly uses the passed rectangle2 parameters as ROI decode_bar_code_rectangle2 (Image, BarCodeHandle, 'EAN-13', Row, Column, Phi, Length1, Length2, Decoded) get_bar_code_object (SymbolRegions, BarCodeHandle, 'all', 'symbol_regions') dev_set_color ('lime green') dev_display (SymbolRegions) disp_message (WindowHandle, 'Found bar code: ' + Decoded, 'window', 5, 5, 'black', 'true') if (ImageIndex < |ImageFilesTea| - 1) disp_continue_message (WindowHandle, 'black', 'true') stop () endif endfor

halcon 设置条码的高度和宽度案例 * This example demonstrates how to use the bar code parameters * 'barcode_height_min' and 'barcode_width_min' to narrow the * number of detected candidate regions in which possible bar * codes are searched for. * * This is especially recommended if some factors like the bar code * type, the number of encoded characters etc. are constant * throughout the application. Then, the manual adjustment of * these parameters can lead to an increasing speed and robustness. * * To illustrate the effect of the parameters, the detected * candidate regions are displayed before and after setting * each of the parameters. It is shown that the number of * potential candidate region decreases when the parameters * are manually adjusted. * **************************************************************** * * Initialization dev_update_off () dev_close_window () read_image (Image, 'barcode/code39/code3906') dev_open_window_fit_image (Image, 0, 0, -1, -1, WindowHandle) set_display_font (WindowHandle, 16, 'mono', 'true', 'false') dev_set_line_width (3) dev_set_draw ('margin') dev_set_color ('green') * MinWidth := 280 MinHeight := 60 * * Display a description Message := 'This example demonstrates how to use the bar code' Message[1] := 'parameters \'barcode_height_min\' and \'barcode_width_min\'' Message[2] := 'to narrow the number of detected candidate regions in' Message[3] := 'which the bar codes are searched for.' disp_message (WindowHandle, Message, 'window', 12, 12, 'black', 'true') disp_continue_message (WindowHandle, 'black', 'true') stop () * * Create a bar code model create_bar_code_model ([], [], BarCodeHandle) * * Adjust the minimal widths of the bar code elements * and find the bar code find_bar_code (Image, SymbolRegions, BarCodeHandle, 'Code 39', DecodedDataStrings) * * Get all candidate regions get_bar_code_object (BarCodeObjects, BarCodeHandle, 'all', 'candidate_regions') * * Display all candidate regions dev_set_colored (12) dev_display (Image) dev_display (BarCodeObjects) Message := 'Candidate regions with default settings' disp_message (WindowHandle, Message, 'window', 12, 12, 'black', 'true') disp_continue_message (WindowHandle, 'black', 'true') stop () Message := 'Adjusting the parameters \'barcode_width_min\' and' Message[1] := '\'barcode_height_min\' to decrease the number of' Message[2] := 'found candidate regions and thus to increase the' Message[3] := 'robustness of the application.' disp_message (WindowHandle, Message, 'window', 40, 12, 'black', 'true') disp_continue_message (WindowHandle, 'black', 'true') stop () * * Minimal bar code width * ----------------------------- * Set the minimal bar code width and search for bar codes again set_bar_code_param (BarCodeHandle, 'barcode_width_min', MinWidth) find_bar_code (Image, SymbolRegions, BarCodeHandle, 'Code 39', DecodedDataStrings) * * Get all candidate regions get_bar_code_object (BarCodeObjects, BarCodeHandle, 'all', 'candidate_regions') * * Display the results dev_display (Image) dev_display (BarCodeObjects) Message := 'Candidate regions with adjusted parameter:' Message[1] := ' \'barcode_width_min\' = ' + MinWidth disp_message (WindowHandle, Message, 'window', 12, 12, 'black', 'true') disp_continue_message (WindowHandle, 'black', 'true') stop () * * Minimal bar code height * ------------------------- * Set the minimal bar code height and search for bar codes again set_bar_code_param (BarCodeHandle, 'barcode_height_min', MinHeight) find_bar_code (Image, SymbolRegions, BarCodeHandle, 'Code 39', DecodedDataStrings) * * Get all candidate regions get_bar_code_object (BarCodeObjects, BarCodeHandle, 'all', 'candidate_regions') * * Display the results dev_display (Image) dev_display (BarCodeObjects) Message := 'Candidate region with adjusted parameters:' Message[1] := ' \'barcode_width_min\' = ' + MinWidth Message[2] := ' \'barcode_height_min\' = ' + MinHeight disp_message (WindowHandle, Message, 'window', 12, 12, 'black', 'true') disp_continue_message (WindowHandle, 'black', 'true') stop () * * Display the symbol region and the decoded string dev_display (Image) dev_set_color ('red') dev_display (BarCodeObjects) dev_set_color ('lime green') dev_display (SymbolRegions) disp_message (WindowHandle, 'Search with adjusted parameters', 'window', 12, 12, 'black', 'true') disp_message (WindowHandle, 'Decoded string: ' + DecodedDataStrings, 'window', 40, 12, 'black', 'true') disp_message (WindowHandle, ['Candidate regions','Symbol region'], 'window', 170, 12, ['red','lime green'], 'true')

没有设置set_bar_code_param (BarCodeHandle, ‘barcode_height_min’, MinHeight) 的情况下 > 设置之后对条码的识别