Chuanshuoge: opencv 41 translation

Monday, 3 May 2021

shift 25pix right and 50px down

50px left, 90 pix up

100px down, 100px left

#main.py

import numpy as np

import argparse

import imutils

import cv2

# construct the argument parser and parse the arguments

ap = argparse.ArgumentParser()

ap.add_argument("-i", "--image", type=str, default="opencv_logo.png",

help="path to the input image")

args = vars(ap.parse_args())

# load the image and display it to our screen

image = cv2.imread(args["image"])

cv2.imshow("Original", image)

# shift the image 25 pixels to the right and 50 pixels down

M = np.float32([[1, 0, 25], [0, 1, 50]])

shifted = cv2.warpAffine(image, M, (image.shape[1], image.shape[0]))

cv2.imshow("Shifted Down and Right", shifted)

# now, let's shift the image 50 pixels to the left and 90 pixels

# up by specifying negative values for the x and y directions,

# respectively

M = np.float32([[1, 0, -50], [0, 1, -90]])

shifted = cv2.warpAffine(image, M, (image.shape[1], image.shape[0]))

cv2.imshow("Shifted Up and Left", shifted)

# use the imutils helper function to translate the image 100 pixels

# down in a single function call

shifted = imutils.translate(image, -100, 100)

cv2.imshow("Shifted Down", shifted)

cv2.waitKey(0)

reference:

Chuanshuoge