python opencv实现旋转矩形框裁减功能_Python

本文实例为大家分享了python opencv实现旋转矩形框裁减的具体代码，供大家参考，具体内容如下

经常遇见旋转矩形框的裁减问题，那么思路是，将矩形框旋转正然后再裁减

									# -*- coding:gb2312 -*-

									import cv2

									from math import *

									import numpy as np

									import time

									def rotateImage(img,degree,pt1,pt2,pt3,pt4):

									  height,width=img.shape[:2]

									  heightNew = int(width * fabs(sin(radians(degree))) + height * fabs(cos(radians(degree))))

									  widthNew = int(height * fabs(sin(radians(degree))) + width * fabs(cos(radians(degree))))

									  matRotation=cv2.getRotationMatrix2D((width/2,height/2),degree,1)

									  matRotation[0, 2] += (widthNew - width) / 2

									  matRotation[1, 2] += (heightNew - height) / 2

									  imgRotation = cv2.warpAffine(img, matRotation, (widthNew, heightNew), borderValue=(255, 255, 255))

									  pt1 = list(pt1)

									  pt3 = list(pt3)

									  [[pt1[0]], [pt1[1]]] = np.dot(matRotation, np.array([[pt1[0]], [pt1[1]], [1]]))

									  [[pt3[0]], [pt3[1]]] = np.dot(matRotation, np.array([[pt3[0]], [pt3[1]], [1]]))

									  imgOut=imgRotation[int(pt1[1]):int(pt3[1]),int(pt1[0]):int(pt3[0])]

									  cv2.imshow("imgOut",imgOut) #裁减得到的旋转矩形框

									  cv2.imwrite("imgOut.jpg",imgOut)

									  # pt2 = list(pt2)

									  # pt4 = list(pt4)

									  # [[pt2[0]], [pt2[1]]] = np.dot(matRotation, np.array([[pt2[0]], [pt2[1]], [1]]))

									  # [[pt4[0]], [pt4[1]]] = np.dot(matRotation, np.array([[pt4[0]], [pt4[1]], [1]]))

									  # pt1 = (int(pt1[0]), int(pt1[1]))

									  # pt2 = (int(pt2[0]), int(pt2[1]))

									  # pt3 = (int(pt3[0]), int(pt3[1]))

									  # pt4 = (int(pt4[0]), int(pt4[1]))

									  # drawRect(imgRotation,pt1,pt2,pt3,pt4,(255,0,0),2)

									  return imgRotation

									def drawRect(img,pt1,pt2,pt3,pt4,color,lineWidth):

									  cv2.line(img, pt1, pt2, color, lineWidth)

									  cv2.line(img, pt2, pt3, color, lineWidth)

									  cv2.line(img, pt3, pt4, color, lineWidth)

									  cv2.line(img, pt1, pt4, color, lineWidth)

									if __name__=="__main__":

									  startTime=time.time()

									  imgSrc=cv2.imread('E:\桌面\lena.jpg')

									  imgResize=cv2.resize(imgSrc,(500,500))

									  pt1=(100,100)

									  pt2=(150,50)

									  pt3=(175,75)

									  pt4=(125,125)

									  # drawRect(imgResize,pt1,pt2,pt3,pt4,(0,0,255),2)

									  imgRotation=rotateImage(imgResize,-degrees(atan2(50,50)),pt1,pt2,pt3,pt4)

									  endTime = time.time()

									  print endTime-startTime

									  cv2.imshow("imgRotation",imgRotation)

									  cv2.imwrite("imgRotation.jpg",imgRotation)

									  cv2.waitKey(0)