标签:with 结果 alc poi sha png import color rom
仿射变换通过一系列原子变换复合实现,具体包括:平移(Translation)、缩放(Scale)、旋转(Rotation)、翻转(Flip)和错切(Shear)。
from __future__ import print_function import cv2 as cv import numpy as np import argparse src = cv.imread(‘D:/lena.jpg‘) if src is None: print(‘Could not open or find the image:‘, args.input) exit(0) ## [Load the image] ## [Set your 3 points to calculate the Affine Transform] srcTri = np.array( [[0, 0], [src.shape[1] - 1, 0], [0, src.shape[0] - 1]] ).astype(np.float32) dstTri = np.array( [[0, src.shape[1]*0.33], [src.shape[1]*0.85, src.shape[0]*0.25], [src.shape[1]*0.15, src.shape[0]*0.7]] ).astype(np.float32) ## [Set your 3 points to calculate the Affine Transform] ## [Get the Affine Transform] warp_mat = cv.getAffineTransform(srcTri, dstTri) print("warp_mat: \n",warp_mat) ## [Get the Affine Transform] ## [Apply the Affine Transform just found to the src image] warp_dst = cv.warpAffine(src, warp_mat, (src.shape[1], src.shape[0])) ## [Apply the Affine Transform just found to the src image] # Rotating the image after Warp ## [Compute a rotation matrix with respect to the center of the image] center = (warp_dst.shape[1]//2, warp_dst.shape[0]//2) angle = -50 scale = 0.6 ## [Compute a rotation matrix with respect to the center of the image] ## [Get the rotation matrix with the specifications above] rot_mat = cv.getRotationMatrix2D( center, angle, scale ) print("rot_mat: \n",rot_mat) ## [Get the rotation matrix with the specifications above] ## [Rotate the warped image] warp_rotate_dst = cv.warpAffine(warp_dst, rot_mat, (warp_dst.shape[1], warp_dst.shape[0])) ## [Rotate the warped image] ## [Show what you got] cv.imshow(‘Source image‘, src) cv.imshow(‘Warp‘, warp_dst) cv.imshow(‘Warp + Rotate‘, warp_rotate_dst) ## [Show what you got] ## [Wait until user exits the program] cv.waitKey() ## [Wait until user exits the program]
输出结果——分别为仿射矩阵和旋转矩阵:
warp_mat: [[ 8.51703407e-01 1.51515152e-01 0.00000000e+00] [-8.21643287e-02 3.68080833e-01 1.65000000e+02]] rot_mat: [[ 0.38567257 -0.45962667 267.56927168] [ 0.45962667 0.38567257 37.44653721]]
标签:with 结果 alc poi sha png import color rom
原文地址:https://www.cnblogs.com/a-runner/p/14434066.html