opencv count rectangle that frame divided into 4 section-CodePudding

I have a haar cascade project that counts cars from video frame by frame, and I start wondering is it possible to divide 1 frame into 4 sections and count the car for each section. For example, I have this frame.

as you can see this frame has 4 screens/sections and I want the haar cascade count the car for each section, but the algorithm that I created only count for 2 section (above and below screens)

    for (x,y,w,h) in cars:
        cv2.rectangle(img,(x,y),(x w,y h),(0,0,255),2)
        # divide screen for 4 screen and count the car
        if x < img.shape[1]/2:
            car_count1  = 1
        elif x < img.shape[1]/2*3:
            car_count2  = 1
        elif x < img.shape[1]/2*5:
            car_count3  = 1
        else:
            car_count4  = 1

For "screen 1" is the above screen that has 8 rectangles, and "screen 2" for below screen that has 13 rectangles. I know the problem is from the elif x < img.shape[1]/2*5: and else:, but I don't know the right condition for this problem.

Thanks

CodePudding user response：

Well first of all you probably want to use the centerpoint of your rectangles to count it for the right frame

centerx = x w/2
centery = y h/2

Your image areas are x < 0.5width and also y < 0.5height for the top left, x > 0.5width and y < 0.5height for top right and so on.

if centerx < img.shape[1]/2 and centery < img.shape[0]/2:
    count1  = 1
if centerx >= img.shape[1]/2 and centery < img.shape[0]/2:
    count2  = 1
if centerx < img.shape[1]/2 and centery >= img.shape[0]/2:
    count3  = 1
if centerx >= img.shape[1]/2 and centery >= img.shape[0]/2:
    count4  = 1