Barcode读取之barcode_param_majority

*这个项目展示了’‘majority_voting’'对一维码读取的影响

This example program shows the effect of the bar code
parameter ‘majority_voting’.
一维码读取器分析并且解码多个扫描行。默认的，当一找到一行可以成功解码的扫描行时，就停止解码。
*在有些场合，由于打印质量原因，这一行代码有可能会是错的
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.
如果这个参数设定为’True’,不管正确与否，所有的扫描都会被分析与解码。最终结果由扫描到的最多数决定
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.
准备可视化设置和对象
Prepare visualization settings and objects
*关闭窗体更新
dev_update_off ()
*关闭窗体先
dev_close_window ()
*读取图像
read_image (Image, ‘barcode/ean13/ean13_label’)
*获取图像尺寸
get_image_size (Image, WidthI, HeightI)
*打开适合图像尺寸的窗体
dev_open_window_fit_image (Image, 0, 0, 600, 500, WindowHandle)
*显示图像
dev_display (Image)
*设置填充方式
dev_set_draw (‘margin’)
*设置显示字体
set_display_font (WindowHandle, 14, ‘mono’, ‘true’, ‘false’)
*限制窗体尺寸
get_window_extents (WindowHandle, Row, Column, Width, Height)
*定义窗体放大因子
WindowZoomFactor := real(WidthI) / Width
*打开窗体
dev_open_window (0, Width + 5, 400, 300, ‘white’, WindowHandleText)
**设置显示字体
set_display_font (WindowHandleText, 14, ‘mono’, ‘true’, ‘false’)
创建一维码读取器
Create bar code reader model
create_bar_code_model ([], [], BarCodeHandle)
第一部分：设置参数majority voting为FALSE
PART I, read bar code without majority voting
MajorityVotingSetting := ‘false’
*设置majority voting参数
set_bar_code_param (BarCodeHandle, ‘majority_voting’, MajorityVotingSetting)
*设置是否保留一些必要的参数，以作后期处理和评估
set_bar_code_param (BarCodeHandle, ‘persistence’, 1)
*定义与之变化差值？
set_bar_code_param (BarCodeHandle, ‘meas_thresh’, 0.1)
*定义与之变化差值绝对值？？
set_bar_code_param (BarCodeHandle, ‘meas_thresh_abs’, 30)
解码和准备结果
Perform decoding and prepare results
*聚焦这个窗体
dev_set_window (WindowHandle)
*解码区域内的信息
decode_bar_code_rectangle2 (Image, BarCodeHandle, ‘EAN-13’, 280, 223, 3.14125 / 2.0, 200, 50, DecodedDataStrings)
*获取解码结果之条码区域
get_bar_code_object (SymbolRegion, BarCodeHandle, ‘all’, ‘symbol_regions’)
*获取解码结果之条码类型
get_bar_code_result (BarCodeHandle, ‘all’, ‘decoded_types’, DecodedTypes)
*获取解码结果之条码内容
get_bar_code_result (BarCodeHandle, ‘all’, ‘decoded_strings’, DecodedData)
*获取解码结果之条码有效扫描行
get_bar_code_object (ValidScanlines, BarCodeHandle, ‘all’, ‘scanlines_valid’)
*本地函数，获取有效行数
get_majority_voting_example_symbols (SymbolRegion, ValidScanlines, DecodedData, BarCodeHandle, DecodedTypes, DecodedData)
*选择有效行数
select_obj (ValidScanlines, FirstScanline, 5)
显示结果和条码
Display results and labels
*显示信息
disp_message (WindowHandle, [‘Looking for bar codes’,’‘majority_voting’ = ‘’ + MajorityVotingSetting + ‘’’], ‘window’, 12, 12, ‘black’, ‘true’)
ColorsText := [‘forest green’,‘red’]
*设置线宽
dev_set_line_width (2)
*生成条码区域
smallest_rectangle1 (SymbolRegion, Row1, Column1, Row2, Column2)
*设置显示颜色
dev_set_color (‘red’)
*显示条码区域
dev_display (SymbolRegion)
*显示第一个有效扫描行
dev_display (FirstScanline)
显示结果
Message := ['Codetype: ','Data: '] + [DecodedTypes,DecodedData]
disp_message (WindowHandle, Message, ‘image’, Row1 - 40 * WindowZoomFactor, Column2 - 100, ColorsText[1], ‘true’)
显示一些描述信息
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’)
*右下角显示’Press F5 TO CONTINUE’
disp_continue_message (WindowHandle, ‘black’, ‘true’)
stop ()
第二部分，*
PART II, enable majority voting
第一部分：设置参数majority voting为FALSE
MajorityVotingSetting := ‘true’
set_bar_code_param (BarCodeHandle, ‘majority_voting’, MajorityVotingSetting)
- 解码和准备结果
Perform decoding and prepare results
*解码区域内的信息
decode_bar_code_rectangle2 (Image, BarCodeHandle, ‘EAN-13’, 280, 223, 3.14125 / 2.0, 200, 50, DecodedDataStrings)
*同上
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’)
select_obj (ValidScanlines, MajorityScanlines, [[1:4],6,7])
显示结果和信息
Display results and labels
dev_display (Image)
disp_message (WindowHandle, [‘Looking for bar codes’,’‘majority_voting’ = ‘’ + MajorityVotingSetting + ‘’’], ‘window’, 12, 12, ‘black’, ‘true’)
*同上
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’)
stop ()
释放内存
Clean up memory
clear_bar_code_model (BarCodeHandle)

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