138         cv::Mat intermediateMat;  in ApplyGrayFilter()  local
139         cv::cvtColor(*mat, intermediateMat, CV_RGBA2GRAY);  in ApplyGrayFilter()
140         cv::cvtColor(intermediateMat, *mat, CV_GRAY2BGRA);  in ApplyGrayFilter()
145         cv::Mat intermediateMat;  in ApplyCannyFilter()  local
146         cv::Canny(*mat, intermediateMat, 80, 90);  in ApplyCannyFilter()
147         cv::cvtColor(intermediateMat, *mat, CV_GRAY2BGRA);  in ApplyCannyFilter()
152         cv::Mat intermediateMat;  in ApplyBlurFilter()  local
154         cv::cvtColor(intermediateMat, *mat, CV_GRAY2BGRA);  in ApplyBlurFilter()
159         cv::Mat intermediateMat;  in ApplyFindFeaturesFilter()  local
163         cv::cvtColor(*mat, intermediateMat, CV_RGBA2GRAY);  in ApplyFindFeaturesFilter()
164         detector->detect(intermediateMat, features);  in ApplyFindFeaturesFilter()