本文實(shí)例為大家分享了Opencv Python實(shí)現(xiàn)兩幅圖像匹配的具體代碼，供大家參考，具體內(nèi)容如下

原圖

import cv2img1 = cv2.imread(’SURF_2.jpg’, cv2.IMREAD_GRAYSCALE)img1 = cv2.resize(img1,dsize=(600,400))img2 = cv2.imread(’SURF_1.jpg’, cv2.IMREAD_GRAYSCALE)img2 = cv2.resize(img2,dsize=(600,400))image1 = img1.copy()image2 = img2.copy()#創(chuàng)建一個(gè)SURF對象surf = cv2.xfeatures2d.SURF_create(25000)#SIFT對象會(huì)使用Hessian算法檢測關(guān)鍵點(diǎn)，并且對每個(gè)關(guān)鍵點(diǎn)周圍的區(qū)域計(jì)算特征向量。該函數(shù)返回關(guān)鍵點(diǎn)的信息和描述符keypoints1,descriptor1 = surf.detectAndCompute(image1,None)keypoints2,descriptor2 = surf.detectAndCompute(image2,None)# print(’descriptor1:’,descriptor1.shape(),’descriptor2’,descriptor2.shape())#在圖像上繪制關(guān)鍵點(diǎn)image1 = cv2.drawKeypoints(image=image1,keypoints = keypoints1,outImage=image1,color=(255,0,255),flags=cv2.DRAW_MATCHES_FLAGS_DRAW_RICH_KEYPOINTS)image2 = cv2.drawKeypoints(image=image2,keypoints = keypoints2,outImage=image2,color=(255,0,255),flags=cv2.DRAW_MATCHES_FLAGS_DRAW_RICH_KEYPOINTS)#顯示圖像cv2.imshow(’surf_keypoints1’,image1)cv2.imshow(’surf_keypoints2’,image2)cv2.waitKey(20)matcher = cv2.FlannBasedMatcher()matchePoints = matcher.match(descriptor1,descriptor2)# print(type(matchePoints),len(matchePoints),matchePoints[0])#提取強(qiáng)匹配特征點(diǎn)minMatch = 1maxMatch = 0for i in range(len(matchePoints)): if minMatch > matchePoints[i].distance:minMatch = matchePoints[i].distance if maxMatch < matchePoints[i].distance:maxMatch = matchePoints[i].distance print(’最佳匹配值是:’,minMatch) print(’最差匹配值是:’,maxMatch)#獲取排雷在前邊的幾個(gè)最優(yōu)匹配結(jié)果goodMatchePoints = []for i in range(len(matchePoints)): if matchePoints[i].distance < minMatch + (maxMatch-minMatch)/16:goodMatchePoints.append(matchePoints[i])#繪制最優(yōu)匹配點(diǎn)outImg = NoneoutImg = cv2.drawMatches(img1,keypoints1,img2,keypoints2,goodMatchePoints,outImg, matchColor=(0,255,0),flags=cv2.DRAW_MATCHES_FLAGS_DEFAULT)cv2.imshow(’matche’,outImg)cv2.waitKey(0)cv2.destroyAllWindows()

原圖

#coding=utf-8import cv2from matplotlib import pyplot as pltimg=cv2.imread(’xfeatures2d.SURF_create2.jpg’,0)# surf=cv2.SURF(400) #Hessian閾值400# kp,des=surf.detectAndCompute(img,None)# leng=len(kp)# print(leng)# 關(guān)鍵點(diǎn)太多，重取閾值surf=cv2.cv2.xfeatures2d.SURF_create(50000) #Hessian閾值50000kp,des=surf.detectAndCompute(img,None)leng=len(kp)print(leng)img2=cv2.drawKeypoints(img,kp,None,(255,0,0),4)plt.imshow(img2)plt.show()# 下面是U-SURF算法,關(guān)鍵點(diǎn)朝向一致，運(yùn)算速度加快。surf.upright=Truekp=surf.detect(img,None)img3=cv2.drawKeypoints(img,kp,None,(255,0,0),4)plt.imshow(img3)plt.show()#檢測關(guān)鍵點(diǎn)描述符大小，改64維成128維surf.extended=Truekp,des=surf.detectAndCompute(img,None)dem1=surf.descriptorSize()print(dem1)shp1=des.shape()print(shp1)

效果圖

import cv2from matplotlib import pyplot as pltleftImage = cv2.imread(’xfeatures2d.SURF_create_1.jpg’)rightImage = cv2.imread(’xfeatures2d.SURF_create_2.jpg’)# 創(chuàng)造siftsift = cv2.xfeatures2d.SIFT_create()kp1, des1 = sift.detectAndCompute(leftImage, None)kp2, des2 = sift.detectAndCompute(rightImage, None) # 返回關(guān)鍵點(diǎn)信息和描述符FLANN_INDEX_KDTREE = 0indexParams = dict(algorithm=FLANN_INDEX_KDTREE, trees=5)searchParams = dict(checks=50) # 指定索引樹要被遍歷的次數(shù)flann = cv2.FlannBasedMatcher(indexParams, searchParams)matches = flann.knnMatch(des1, des2, k=2)matchesMask = [[0, 0] for i in range(len(matches))]print('matches', matches[0])for i, (m, n) in enumerate(matches): if m.distance < 0.07 * n.distance:matchesMask[i] = [1, 0]drawParams = dict(matchColor=(0, 255, 0), singlePointColor=None, matchesMask=matchesMask, flags=2) # flag=2只畫出匹配點(diǎn)，flag=0把所有的點(diǎn)都畫出resultImage = cv2.drawMatchesKnn(leftImage, kp1, rightImage, kp2, matches, None, **drawParams)plt.imshow(resultImage)plt.show()

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