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how to zoom using opencv

yuvraj mehta answered on August 16, 2022 Popularity 7/10 Helpfulness 4/10

answer how to zoom using opencv

how to zoom using opencv

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import cv2
#mine webcam works with index 1 you can use -1,0 
cap = cv2.VideoCapture(1)
cap.set(3, 640)
cap.set(4, 480)

scale = input("At what scale ")#to set the scale of zoom
scale = float(scale)
#zoom function
def zoom(img, center=None):
        
        height, width = img.shape[:2]
        if center is None:
            
            center_x = int(width / 2)
            center_y = int(height / 2)
            radius_x, radius_y = int(width / 2), int(height / 2)
        else:
            
            enter_x, center_y = center
    
            center_x, center_y = int(center_x), int(center_y)
            left_x, right_x = center_x, int(width - center_x)
            up_y, down_y = int(height - center_y), center_y
            radius_x = min(left_x, right_x)
            radius_y = min(up_y, down_y)
    
        
        radius_x, radius_y = int(scale * radius_x), int(scale * radius_y)
    
        
        min_x, max_x = center_x - radius_x, center_x + radius_x
        min_y, max_y = center_y - radius_y, center_y + radius_y
    
        
        cropped = img[min_y:max_y, min_x:max_x]
        
        new_cropped = cv2.resize(cropped, (width, height))
    
        return new_cropped
#main loop
while cap.isOpened():
    ret,frame = cap.read()

    cv2.imshow("frame",frame)
    
    img = zoom(frame)
    frame = img
    cv2.imshow("zoomed frame",img)
    if cv2.waitKey(1) & 0xFF == ord("q"):
        break
cap.release()
cv2.destroyAllWindows()

Popularity 7/10 Helpfulness 4/10 Language python

Source: Grepper

Tags: opencv python using

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Contributed on Aug 16 2022

yuvraj mehta

0 Answers Avg Quality 2/10

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