How to realize picture zooming and mirroring by opencv
This article mainly introduces how opencv realizes picture zooming and mirroring. The introduction in this article is very detailed and has certain reference value. Interested friends must read it!
An exercise code to zoom and then mirror an image:
import cv2
import numpy as np
#Open the original
img = cv2.imread("src.jpg", 1)
cv2.imshow("src",img)
#Get original information
imgInfo = img.shape
height = imgInfo[0]
width = imgInfo[1]
deep = imgInfo[2]
#The picture is too big, and the screen is not fully displayed after mirroring. Zoom here first.
matScale = np.float32([[0.8,0,0], [0,0.8,0]])
scale = cv2.warpAffine(img, matScale, (int(width*0.8), int(height*0.8)))
cv2.imshow("scale", scale)
#Re-capture the height and width of the zoomed image
imgInfo = scale.shape
height = imgInfo[0]
width = imgInfo[1]
#Image information mirrored
newImgInfo = (height * 2, width, deep)
dest = np.zeros(newImgInfo, np.uint8)
#Mirrors
for i in range(0, height):
for j in range(0, width):
dest[i,j] = scale[i,j]
dest[height*2 - i -1, j] = scale[i, j]
#Draw a mirror image of the original dividing line
for i in range(0, width):
dest[height, i] = (0,0,255)
cv2.imshow("dst", dest)
cv2.waitKey(0)
After the program runs, the effect is as follows:
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