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今天调试下面这段代码的时候遇到了个小问题，在自己多次调试后终于找到解决方案，下面分享给大家：
调试代码：
res_path='G:/coding_data/Model_Zoo/PoolNet/training_testing_data/DUTS-TE/DUTS-TE-Results/'
gt_path='G:/coding_data/Model_Zoo/PoolNet/training_testing_data/DUTS-TE/DUTS-TE-Mask/'
res_list=os.listdir(res_path) #print(res_list) mae=[] for i in
range(len(res_list)): #print('res_list',res_list[i])
r_name=res_path+res_list[i] #print('r_name:',r_name)
g_name=gt_path+res_list[i][:-13]+'.png' #print('res_list[i]:', res_list[i])
#print(g_name) res=cv2.imread(r_name) h,w,_=res.shape res = cv2.cvtColor(res,
cv2.COLOR_RGB2GRAY) res=res/255 gt=cv2.imread(g_name) gt = cv2.cvtColor(gt,
cv2.COLOR_RGB2GRAY) gt=gt/255 mae.append(sum(sum(abs(res-gt)))/(h*w))
print(sum(sum(abs(res-gt)))/(h*w)) return sum(mae)/len(mae)
问题：
cv2.error: OpenCV(3.4.2)
c:\projects\opencv-python\opencv\modules\imgproc\src\color.hpp:253: error:
(-215:Assertion failed) VScn::contains(scn) && VDcn::contains(dcn) &&
VDepth::contains(depth) in function 'cv::CvtHelper<struct
cv::Set<3,4,-1>,struct cv::Set<1,-1,-1>,struct cv::Set<0,2,5>,2>::CvtHelper'
针对该问题，查阅博客给出的方案都是检查路径名称，一般是路径名称不对。
我在多次检查确认路径名称后，发现代码的路径并没有问题，最后通过输出每次读入 r_name和 g_name的图片名称找到问题所在：
该问题产生的原因为：
两个路径下图片不对应，即：res_path 和 gt_path 下的图片不是一一对应的，存在缺少图片的情况
解决方案：
删掉文件夹中缺少的图片或者补充多余的图片即可
