Barcode读取之barcode_para_contrast

*本例展示了如何使用一维码参数’contrast_min’

Example program for the usage of the bar code parameter
‘contrast_min’.
通过设置这个参数，在低对比度的类条码结构中可以减少寻找一维码的时间
*如果条码有较高的对比度时，也可以用来减少错误信息
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.
创建一维码读取句柄
Create bar code reader model
create_bar_code_model ([], [], BarCodeHandle)
*设置条码参数，元素最小尺寸
set_bar_code_param (BarCodeHandle, ‘element_size_min’, 1.5)
初始化
Initialization
*关闭更新
dev_update_off ()
*关闭窗体
dev_close_window ()
读取和显示没有任何可见条码的样本图像
Read and display example images without any visible bar codes
*读取图像
read_image (Image, ‘barcode/25interleaved/25interleaved_zeiss1’)
设置默认显示参数
Set display defaults
*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’)
*获取窗体尺寸
get_window_extents (WindowHandle, Row, Column, Width, Height)
*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’)
定义显示样本信息
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’],’$1\n’)
disp_message (WindowHandleText, MessageWrapped, ‘window’, 12, 12, ‘black’, ‘false’)
disp_continue_message (WindowHandle, ‘black’, ‘true’)
stop ()
dev_set_window (WindowHandle)
*清除窗体
dev_clear_window ()
*显示图像
dev_display (Image)
定义循环次数
Number of repetitions for runtime measurements
NumRepeat := 100
第一步：设置条码候选区域的最小对比度为0
First, set the minimum contrast of the bar code candidate regions
to 0 (default)
ContrastMinValue := 0
*设置默认对比度为0
set_bar_code_param (BarCodeHandle, ‘contrast_min’, ContrastMinValue)
条吗读取器会找到多个条码值
The bar code reader finds many bar code candidate regions that have
a low absolute contrast
Times := []
*开始循环寻找条码值
for I := 0 to NumRepeat by 1
*开始计时
count_seconds (Start)
*寻找条码
find_bar_code (Image, SymbolRegions, BarCodeHandle, ‘auto’, DecodedDataStrings)
*计时结束
count_seconds (End)
Time := End - Start
Times := [Times,Time]
endfor
RunTimeContrastMinLow := 1000 * median(Times)
*获取疑似区域，显示结果
Get candidate regions and display results
*获取疑似区域
get_bar_code_object (BarCodeObjects, BarCodeHandle, ‘all’, ‘candidate_regions’)
*获取数量
count_obj (BarCodeObjects, Number)
*设置显示颜色
dev_set_color (‘red’)
*设置线宽
dev_set_line_width (5)
*显示物体
dev_display (BarCodeObjects)
*聚焦窗体
dev_set_window (WindowHandleText)
*清除窗体
dev_clear_window ()
Message := [’‘contrast_min’ = ’ + ContrastMinValue + ‘:’,’ Found ’ + Number + ’ candidate(s) in ’ + (RunTimeContrastMinLow$’.4’) + ’ ms’]
*显示信息
disp_message (WindowHandleText, Message, ‘window’, 12, 12, ‘’, ‘false’)
现在把对比度设置大一点，使区域的对比度至少比这个值要大才会被识别到
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.
*设置最小对比度为120
ContrastMinValue := 120
set_bar_code_param (BarCodeHandle, ‘contrast_min’, ContrastMinValue)
再寻找条码，由于对比度设置大了一些，所以这次找到的数量会更少，消耗时间也会更少
Search again for bar codes. Now, a significantly smaller number of
candidates should be found, and the overall runtime should be reduced.
Times := []
*开始寻找条码
for I := 0 to NumRepeat by 1
*开始计时
count_seconds (Start)
*寻找条码值
find_bar_code (Image, SymbolRegions, BarCodeHandle, ‘auto’, DecodedDataStrings)
*计时结束
count_seconds (End)
Time := End - Start
Times := [Times,Time]
endfor
RunTimeContrastMinHigh := 1000 * median(Times)
*获取区域，显示结果
Get candidate regions and display results
*聚焦窗体
dev_set_window (WindowHandle)
*获取区域
get_bar_code_object (BarCodeObjects, BarCodeHandle, ‘all’, ‘candidate_regions’)
*获取区域数量
count_obj (BarCodeObjects, Number)
*设置显示颜色
dev_set_color (‘forest green’)
*设置线宽
dev_set_line_width (3)
*显示物体
dev_display (BarCodeObjects)
*求区域的最小外接矩形
smallest_rectangle1 (SymbolRegions, Row1, Column1, Row2, Column2)
*获取结果
get_bar_code_result (BarCodeHandle, ‘all’, ‘decoded_types’, DecodedTypes)
*显示信息
disp_message (WindowHandle, DecodedTypes + ‘\n’ + DecodedDataStrings, ‘image’, Row1, Column2 + 20, ‘black’, ‘true’)
*激活窗体
dev_set_window (WindowHandleText)
*显示一些信息
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’)
清除句柄，释放内存
Close the bar code reader
clear_bar_code_model (BarCodeHandle)

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