while(True): _, frame = cap.read() hsv = cv2.cvtColor(frame, cv2.COLOR_BGR2HSV) a, b = 0, 0 height, width, layers = frame.shape start_height = height - height left_x = width - 500 #right_area = frame[y:y+height, x:x+300] #left_area = frame[y:y+height,] black_min = np.array([0, 0, 0], np.uint8) black_max = np.array([179, 255, 70], np.uint8) red_min = np.array([0, 70, 50], np.uint8) red_max = np.array([20, 255, 255], np.uint8) red1 = np.array([170, 70, 50], np.uint8) red2 = np.array([180, 255, 255], np.uint8) red_mask = cv2.inRange(hsv, red1, red2) red_mask2 = cv2.inRange(hsv, red_min, red_max) kernel = np.ones((7, 7), "uint8") red_mask = cv2.dilate(red_mask, kernel) res_red = cv2.bitwise_and(frame, frame, mask=red_mask) red_mask2 = cv2.dilate(red_mask2, kernel) res_red2 = cv2.bitwise_and(frame, frame, mask=red_mask2) area1 = frame[a:a + height, b:b + 300] area2 = frame[a:a + height, left_x:left_x + 500] cnts, _ = cv2.findContours(red_mask, cv2.RETR_TREE, cv2.CHAIN_APPROX_SIMPLE) for pic, c in enumerate(cnts): area = cv2.contourArea(c) if (700 > area > 350): x,y,w,h = cv2.boundingRect(c) cv2.rectangle(frame, (x, y),(x + w, y + h),(0, 0, 255), 2) cv2.putText(frame, "Red detected", (x, y), cv2.FONT_HERSHEY_SIMPLEX, 1.0, (0, 0, 255)) cv2.imshow("Video from camera", frame) if cv2.waitKey(10) & 0xFF == ord('q'): break
I belive that for C++ the solution looks like this:
findContours(Mask(cv::Rect(x,y,width,height)), contours, hierarchy, RETR_TREE, CHAIN_APPROX_SIMPLE, Point(0,0) );
How can I change this line to get the results I want?
this is the area I’m interested in frame[a:a + height, b:left_x + 300] Thanks in advance!
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Answer
your code looks strange to me, here a snippet with a line
QString line="144,81:626,232"; QStringList points = line.split(":"); qDebug()<< points[0]; qDebug()<< points[1]; QRectF rectangle; QStringList xy1 = points[0].split(","); qDebug()<< xy1[0]; qDebug()<< xy1[1]; auto x1=QString(xy1[0]).toFloat(); auto y1=QString(xy1[1]).toFloat(); rectangle.setTopLeft(QPointF(x1,y1)); xy1 = points[1].split(","); qDebug()<< xy1[0]; qDebug()<< xy1[1]; x1=QString(xy1[0]).toFloat(); y1=QString(xy1[1]).toFloat(); rectangle.setBottomRight(QPointF(x1,y1)); qDebug() << "Rec: " << rectangle; return 0;
so for the input "144,81:626,232";
you get the output:
Rec: QRectF(144,81 482x151)
because that is the way qt print rectangle objects-> topLeftPoint wxh