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opencv中文说明中是这样说的:
threshold
对数组元素进行固定阈值操作
void cvthreshold( const cvarr* src, cvarr* dst, double threshold, double max_value, int threshold_type );
# cv.thresh_otsu 整幅图像 自动测试阀值 # 如果 src(x,y)>threshold ,dst(x,y) = max_value; 否则,dst(x,y)=0; ret1,thresh1=cv.threshold(grade,0,255,cv.thresh_binary|cv.thresh_otsu) # 如果 src(x,y)>threshold,dst(x,y) = 0; 否则,dst(x,y) = max_value. ret2,thresh2=cv.threshold(grade,0,255,cv.thresh_binary_inv|cv.thresh_otsu)
# adaptivethreshold:自适应阈值二值化 # dst = cv2.adaptivethreshold(src, maxval, thresh_type, type, block # size, c) # # src: 输入图,只能输入单通道图像,通常来说为灰度图 # dst: 输出图 # maxval: 当像素值超过了阈值(或者小于阈值,根据type来决定),所赋予的值 # thresh_type: 阈值的计算方法,包含以下2种类型:cv2.adaptive_thresh_mean_c; cv2.adaptive_thresh_gaussian_c. # type:二值化操作的类型,与固定阈值函数相同,包含以下5种类型: cv2.thresh_binary; cv2.thresh_binary_inv; cv2.thresh_trunc; cv2.thresh_tozero;cv2.thresh_tozero_inv. # block # size: 图片中分块的大小 # c :阈值计算方法中的常数项 th1=cv.adaptivethreshold(grade,255,cv.adaptive_thresh_mean_c,cv.thresh_binary,11,3) th2=cv.adaptivethreshold(grade,255,cv.adaptive_thresh_gaussian_c,cv.thresh_binary,11,3)
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