快速傅里叶变换FFT下的缺陷检测
* to detect small texture defects on the surface of plastic items* by using the fast fourier transform (FFT)
dev_update_off ()
dev_close_window ()
read_image (Image, 'plastics/plastics_01')
get_image_size (Image, Width, Height)
dev_open_window (0, 0, Width, Height, 'black', WindowHandle)
set_display_font (WindowHandle, 14, 'mono', 'true', 'false')
dev_set_draw ('margin')
dev_set_line_width (3)
dev_set_color ('red')
* 优化FFT计算速度
optimize_rft_speed (Width, Height, 'standard')
* 高斯带通滤波
Sigma1 := 10.0
Sigma2 := 3.0
gen_gauss_filter (GaussFilter1, Sigma1, Sigma1, 0.0, 'none', 'rft', Width, Height)
gen_gauss_filter (GaussFilter2, Sigma2, Sigma2, 0.0, 'none', 'rft', Width, Height)
sub_image (GaussFilter1, GaussFilter2, Filter, 1, 0)
* 循环读取
NumImages := 11
for Index := 1 to NumImages by 1
* 读入图像
read_image (Image, 'plastics/plastics_' + Index 02')
rgb1_to_gray (Image, Image)
* Perform the convolution in the frequency domain
rft_generic (Image, ImageFFT, 'to_freq', 'none', 'complex', Width)
convol_fft (ImageFFT, Filter, ImageConvol)
rft_generic (ImageConvol, ImageFiltered, 'from_freq', 'n', 'real', Width)
* 对滤波后图像进行处理
* 在10x10掩膜内，遍历计算maxGrayValue-minGrayValue
gray_range_rect (ImageFiltered, ImageResult, 10, 10)
min_max_gray (ImageResult, ImageResult, 0, Min, Max, Range)
threshold (ImageResult, RegionDynThresh, max(), 255)
* 连通域检测
connection (RegionDynThresh, ConnectedRegions)
select_shape (ConnectedRegions, SelectedRegions, 'area', 'and', 4, 99999)
union1 (SelectedRegions, RegionUnion)
* 形态学闭运算
closing_circle (RegionUnion, RegionClosing, 10)
connection (RegionClosing, ConnectedRegions1)
select_shape (ConnectedRegions1, SelectedRegions1, 'area', 'and', 10, 99999)
area_center (SelectedRegions1, Area, Row, Column)
* 显示最终的结果
dev_display (Image)
Number := |Area|
if (Number)
gen_circle_contour_xld (ContCircle, Row, Column, gen_tuple_const(Number,30), gen_tuple_const(Number,0), gen_tuple_const(Number,rad(360)), 'positive', 1)
ResultMessage := ['Not OK',Number + ' defect(s) found']
Color := ['red','black']
dev_display (ContCircle)
else
ResultMessage := 'OK'
Color := 'forest green'
endif
disp_message (WindowHandle, ResultMessage, 'window', 12, 12, Color, 'true')
if (Index != NumImages)
disp_continue_message (WindowHandle, 'black', 'true')
stop ()
endif
endfor
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