您好,登錄后才能下訂單哦!
這篇文章主要介紹了如何在python中使用opencv實(shí)現(xiàn)一個(gè)旋轉(zhuǎn)矩形框裁減功能,此處通過實(shí)例代碼給大家介紹的非常詳細(xì),對(duì)大家的學(xué)習(xí)或工作具有一定的參考價(jià)值,需要的朋友可以參考下:
Python是一種跨平臺(tái)的、具有解釋性、編譯性、互動(dòng)性和面向?qū)ο蟮哪_本語言,其最初的設(shè)計(jì)是用于編寫自動(dòng)化腳本,隨著版本的不斷更新和新功能的添加,常用于用于開發(fā)獨(dú)立的項(xiàng)目和大型項(xiàng)目。
# -*- 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) #裁減得到的旋轉(zhuǎn)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)
到此這篇關(guān)于如何在python中使用opencv實(shí)現(xiàn)一個(gè)旋轉(zhuǎn)矩形框裁減功能的文章就介紹到這了,更多相關(guān)如何在python中使用opencv實(shí)現(xiàn)一個(gè)旋轉(zhuǎn)矩形框裁減功能的內(nèi)容請(qǐng)搜索億速云以前的文章或繼續(xù)瀏覽下面的相關(guān)文章希望大家以后多多支持億速云!
免責(zé)聲明:本站發(fā)布的內(nèi)容(圖片、視頻和文字)以原創(chuàng)、轉(zhuǎn)載和分享為主,文章觀點(diǎn)不代表本網(wǎng)站立場(chǎng),如果涉及侵權(quán)請(qǐng)聯(lián)系站長(zhǎng)郵箱:is@yisu.com進(jìn)行舉報(bào),并提供相關(guān)證據(jù),一經(jīng)查實(shí),將立刻刪除涉嫌侵權(quán)內(nèi)容。