如何使用FLANN优化许多图片的SIFT功能匹配?
我有一个来自Python OpenCV文档的工作示例。然而,这是比较一个图像与另一个,它是缓慢的。我需要它来搜索一系列图像(几千)中的特征匹配,我需要它更快。
我现在的想法:
import sys # For debugging only import numpy as np import cv2 from matplotlib import pyplot as plt MIN_MATCH_COUNT = 10 img1 = cv2.imread('image.jpg',0) # queryImage img2 = cv2.imread('target.jpg',0) # trainImage # Initiate SIFT detector sift = cv2.SIFT() # find the keypoints and descriptors with SIFT kp1, des1 = sift.detectAndCompute(img1,None) kp2, des2 = sift.detectAndCompute(img2,None) FLANN_INDEX_KDTREE = 0 index_params = dict(algorithm = FLANN_INDEX_KDTREE, trees = 5) search_params = dict(checks = 50) flann = cv2.FlannBasedMatcher(index_params, search_params) matches = flann.knnMatch(des1,des2,k=2) # store all the good matches as per Lowe's ratio test. good = [] for m,n in matches: if m.distance MIN_MATCH_COUNT: src_pts = np.float32([ kp1[m.queryIdx].pt for m in good ]).reshape(-1,1,2) dst_pts = np.float32([ kp2[m.trainIdx].pt for m in good ]).reshape(-1,1,2) M, mask = cv2.findHomography(src_pts, dst_pts, cv2.RANSAC,5.0) matchesMask = mask.ravel().tolist() h,w = img1.shape pts = np.float32([ [0,0],[0,h-1],[w-1,h-1],[w-1,0] ]).reshape(-1,1,2) dst = cv2.perspectiveTransform(pts,M) img2 = cv2.polylines(img2,[np.int32(dst)],True,255,3, cv2.LINE_AA) else: print "Not enough matches are found - %d/%d" % (len(good),MIN_MATCH_COUNT) matchesMask = None draw_params = dict(matchColor = (0,255,0), # draw matches in green color singlePointColor = None, matchesMask = matchesMask, # draw only inliers flags = 2) img3 = cv2.drawMatches(img1,kp1,img2,kp2,good,None,**draw_params) plt.imshow(img3, 'gray'),plt.show()
更新
在尝试了很多事情之后,我现在可能更接近解决方案了。我希望可以建立索引,然后像这样搜索:
flann_params = dict(algorithm=1, trees=4) flann = cv2.flann_Index(npArray, flann_params) idx, dist = flann.knnSearch(queryDes, 1, params={})
但是,我仍然没有成功地为flann_索引参数构建一个可接受的npArray。
loop through all images as image: npArray.append(sift.detectAndCompute(image, None)) npArray = np.array(npArray)
以下是我的几点建议:
这是一个非常有趣的话题。我的耳朵也开了。
随着@stanleysu2005的回复,我想补充一些技巧,如何做整个匹配本身,因为我目前正在工作这样的事情。
一般的建议是查看OpenCV中的缝合过程并阅读源代码。缝合管道是一个直截了当的流程集,您只需看看如何准确地实现单个步骤。
关于我在多个文件中进行匹配的问题,可以在这里找到一个示例:https://github.com/Itseez/opencv/blob/2.4/samples/cpp/matching_to_many_images.cpp
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