[OpenCV] rescale.py

Resizing an image

import cv2 as cv

# Scale the image in a particular size
def rescaleFrame(frame, scale=0.5):
    width = int(frame.shape[1]*scale)
    height = int(frame.shape[0]*scale)
    dimensions = (width, height)

    return cv.resize(frame, dimensions, interpolation=cv.INTER_AREA)

img = cv.imread('Photos/cat.jpg')
cv.imshow('Cat', img)
cv.imshow('Resize Cat', rescaleFrame(img))

cv.waitKey(0)

 

Resizing a video

import cv2 as cv

# Scale the image in a particular size
def rescaleFrame(frame, scale=0.5):
    width = int(frame.shape[1]*scale)
    height = int(frame.shape[0]*scale)
    dimensions = (width, height)

    return cv.resize(frame, dimensions, interpolation=cv.INTER_AREA)


# Reading videos
capture = cv.VideoCapture('Videos/dog.mp4')

while True:
    isTrue, frame = capture.read()

    # Resizing
    frame_resized = rescaleFrame(frame)

    cv.imshow('Video', frame)
    cv.imshow('Video Resized', frame_resized)

    if cv.waitKey(20) & 0xFF==ord('d'):
        break

capture.release()
cv.destroyAllWindows()

---

Change the resolution

import cv2 as cv

# Scale the image in a particular size
def rescaleFrame(frame, scale=0.5):
    # Images, Videos and Live Video
    width = int(frame.shape[1]*scale)
    height = int(frame.shape[0]*scale)
    dimensions = (width, height)

    return cv.resize(frame, dimensions, interpolation=cv.INTER_AREA)


# Change the resolution
def changeRes(width, height):
    # Live video
    capture.set(3,width)
    capture.set(4,height)


# Reading videos
capture = cv.VideoCapture('Videos/dog.mp4')

while True:
    isTrue, frame = capture.read()

    # Resizing
    frame_resized = rescaleFrame(frame)

    cv.imshow('Video', frame)
    cv.imshow('Video Resized', frame_resized)

    if cv.waitKey(20) & 0xFF==ord('d'):
        break

capture.release()
cv.destroyAllWindows()