Mastering OpenCV 4 with Python

Scaling an image

When scaling an image, you can call cv2.resize() with a specific size, and the scaling factors (fx and fy) will be calculated based on the provided size, as shown in the following code:

resized_image = cv2.resize(image, (width * 2, height * 2), interpolation=cv2.INTER_LINEAR)

On the other hand, you can provide both the fx and fy values. For example, if you want to shrink the image by a factor of 2, you can use the following code:

dst_image = cv2.resize(image, None, fx=0.5, fy=0.5, interpolation=cv2.INTER_AREA)

If you want to enlarge the image, the best approach is to use the cv2.INTER_CUBIC interpolation method (a time-consuming interpolation method) or cv2.INTER_LINEAR. If you want to shrink the image, the general approach ...