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How can define the follwing ROI?

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Hello I have a small problem with my code. I have made the full code to identify a region of interest, but the big problem is .. I have a small static camera who capture empty parking spaces. I need define a static region of the interest, when the camera captures the first image, define the places of interest. The problem I have in my code is I call the function "regionOfInterest()" inside a while loop.> void regionOfInterest(Mat& frame){ Mat hsvImage; cvtColor(frame,hsvImage,COLOR_RGB2HSV); vectorHSV_CHANNELS; split(hsvImage, HSV_CHANNELS); Mat hueImage = HSV_CHANNELS[0]; Mat hueMask; inRange(hueImage, hueValue - hueRange, hueValue + hueRange, hueMask); if (hueValue - hueRange < 0 || hueValue + hueRange > 180){ Mat hueMaskUpper; int upperHueValue = hueValue + 180; inRange(hueImage, upperHueValue - hueRange, upperHueValue + hueRange, hueMaskUpper); hueMask = hueMask | hueMaskUpper; } Mat saturationMask = HSV_CHANNELS[1] > minSaturation; Mat valueMask = HSV_CHANNELS[2] > minValue; hueMask = (hueMask & saturationMask) & valueMask; vector lines; HoughLinesP(hueMask, lines, 1, CV_PI/360, 50, 50, 10); for (unsigned int i = 0; i < lines.size(); ++i){ Point(lines[i][0], lines[i][1]); Point(lines[i][2], lines[i][3]); } vectorpts; for(unsigned int i = 0; i < lines.size(); i++){ pts.push_back(Point(lines[i][0],lines[i][1])); pts.push_back(Point(lines[i][2],lines[i][3])); } /*GET THE PREVIOUS POINTS DETECTED IN THE IMAGE*/ Rect box = boundingRect(pts); /*DRAW RECTANGLE REGION OF INTEREST*/ rectangle(frame, box.tl(), box.br(), Scalar(0, 255, 0), 2); }

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