res-changes.py

import numpy as np
import cv2

cap = cv2.VideoCapture(0)

def make_1080p():
    cap.set(3, 1920)
    cap.set(4, 1080)

def make_720p():
    cap.set(3, 1280)
    cap.set(4, 720)

def make_480p():
    cap.set(3, 640)
    cap.set(4, 480)

def change_res(width, height):
    cap.set(3, width)
    cap.set(4, height)


def rescale_frame(frame, percent=75):
    scale_percent = 75
    width = int(frame.shape[1] * scale_percent / 100)
    height = int(frame.shape[0] * scale_percent / 100)
    dim = (width, height)
    return cv2.resize(frame, dim, interpolation =cv2.INTER_AREA)


while(True):
    # Capture frame-by-frame
    ret, frame = cap.read()
    frame = rescale_frame(frame, percent=30)
    # Display the resulting frame
    cv2.imshow('frame',frame)
    frame2 = rescale_frame(frame, percent=500)
    cv2.imshow('frame2',frame2)
    if cv2.waitKey(20) & 0xFF == ord('q'):
        break

# When everything done, release the capture
cap.release()
cv2.destroyAllWindows()