变换原理:
https://www.cnblogs.com/txwtech/p/18024547
python示范代码:
src2原图,4个坐标点
dst2转换后,4个坐标点
p_touyin = cv2.getPerspectiveTransform(src2,dst2) #计算投影变换矩阵
#利用矩阵值进行图像投影变换
r_bianhuan = cv2.warpPerspective(img_touyin,p_touyin,(w2,h2),borderValue = 125)
# This is a sample Python script.
# Press Shift+F10 to execute it or replace it with your code.
# Press Double Shift to search everywhere for classes, files, tool windows, actions, and settings.
def print_hi(name):
# Use a breakpoint in the code line below to debug your script.
print(f'Hi, {name}') # Press Ctrl+F8 to toggle the breakpoint.
import sys
import cv2
from numpy import *
import numpy as np
# Press the green button in the gutter to run the script.
if __name__ == '__main__':
print_hi('nice day')
#图像的仿射变换
#if len(sys.argv) >1:
if 2 > 1:
#image = cv2.imread(sys.argv[1],cv2.IMREAD_GRAYSCALE)
image = cv2.imread(r'D:\deep_learning\qiqiu\qiqiu.jpg', cv2.IMREAD_GRAYSCALE)
else:
print('image error')
cv2.imwrite('img0206.jpg',image)
#读取原图高和宽
h_y, w_x = image.shape[:2]
print('h,w',h_y, w_x)
#python opencv resize实现缩放,缩放到原来的一般
dst2 = cv2.resize(image,(int(h_y/2),int(w_x/2)))
#cv2.imshow('0.5',dst2)
'''
dsize:是一个整体包好了(宽和高)(int(h_y/2),int(w_x/2))
Traceback (most recent call last):
File "d:/PycharmProjects/pythonProject2/main.py", line 35, in <module>
dst2 = cv2.resize(image,int(h_y/2),int(w_x/2))
cv2.error: OpenCV(4.9.0) :-1: error: (-5:Bad argument) in function 'resize'
> Overload resolution failed:
> - Can't parse 'dsize'. Input argument doesn't provide sequence protocol
> - Can't parse 'dsize'. Input argument doesn't provide sequence protocol
'''
#缩放0.25倍,四分之一
dst2a = cv2.resize(image,(0,0),fx=0.25,fy=0.25,interpolation=cv2.INTER_LINEAR)
# cv2.imshow('0.25x', dst2a)
# cv2.waitKey(0)
# cv2.destroyAllWindows()
#rotate实现图像旋转函数翻转
rImg = cv2.rotate(image, cv2.ROTATE_90_CLOCKWISE)
# cv2.imshow('rotate', rImg)
# cv2.waitKey(0)
#cv2.destroyAllWindows()
img_touyin = cv2.imread(r'D:\deep_learning\hub2.jpg', cv2.IMREAD_GRAYSCALE)
h2, w2 = img_touyin.shape
#src2 = np.array([[343,1140],[715,1136],[295,1644],[889,1656]],np.float32)
#dst2 = np.array([[295,1140],[889,1140],[295,1844],[889,1856]],np.float32)
src2 = np.array([[525, 187], [735,337], [503, 1299], [741, 1313]], np.float32)
dst2 = np.array([[280, 337], [735,337], [280, 1313], [741, 1313]], np.float32)
p_touyin = cv2.getPerspectiveTransform(src2,dst2) #计算投影变换矩阵
#利用矩阵值进行图像投影变换
r_bianhuan = cv2.warpPerspective(img_touyin,p_touyin,(w2,h2),borderValue = 125)
cv2.imshow('yuantu',img_touyin)
cv2.imwrite(r'D:\deep_learning\bianhuan2a.jpg', r_bianhuan)
cv2.imshow('warpPerspective',r_bianhuan)
cv2.waitKey(0)
cv2.destroyAllWindows()