def depthmatch(x,y,leftimage,rightimage,roi=80,buf=50,baseline=2.7,focal_length=80): """depthmatch function x,y : (int) pixel position of target in left image leftimage, rightimage : (IplImage) stereo images roi: (int) region of interest around x,y to use in matching buf: (int) buffer outside of a straight horizontal search for a match """ #print "Match",x,y info = cv.cvGetSize(leftimage) width = info.width height = info.height centerx = width/2 centery = height/2 (y1,x1,y2,x2) = (y-roi,x-roi,y+roi,x+roi) if y1<0: y1 = 0 if x1<0: x1 = 0 if y2>height: y2 = height if x2>width: x2 = width # copy subregion roi x roi template_rect = cv.cvRect(x1,y1,(x2-x1),(y2-y1)) template = cv.cvGetSubRect(leftimage, template_rect) #(y3,x3,y4,x4) = (y-roi-buf,x-roi-buf,y+roi+buf,width) # +/- 20 pixels in vertical direction, -20 to the right edge (y3,x3,y4,x4) = (y-roi-buf,0,y+roi+buf,x+roi+buf) # +/- buf pixels in vertical direction, +buf to the left edge if x3<0: x3 = 0 if y3<0: y3 = 0 if x4>=width: x4 = width-1 if y4>height: y4 = height #cv.cvSetImageROI(rightimage, (y3,x3,y4,x4)) rightsub_rect = cv.cvRect(x3,y3,(x4-x3),(y4-y3)) rightsub = cv.cvGetSubRect(rightimage, rightsub_rect) # result matrix should be (W - w + 1) x (H - h + 1) where WxH are template dimensions, wxh are rightsub dimensions W = x4-x3 H = y4-y3 w = x2-x1 h = y2-y1 resy = (y4-y3)-(y2-y1)+1 resx = (x4-x3)-(x2-x1)+1 resultmat = cv.cvCreateImage((resx, resy), 32, 1) cv.cvZero(resultmat) # match template image in a subportion of rightimage cv.cvMatchTemplate(rightsub, template, resultmat, cv.CV_TM_SQDIFF) min_val, max_val, min_point, max_point = cv.cvMinMaxLoc(resultmat) cv.cvNormalize(resultmat, resultmat, 1, 0, cv.CV_MINMAX) depth = plane2point(x-centerx, y-centery, x3+min_point.x+roi-centerx, y3+min_point.y+roi-centery, baseline, focal_length) #print "Found match at", min_point.x+x3, min_point.y+y3 return (depth, (x,y), (x3+min_point.x+roi, y3+min_point.y+roi))
def matchTemplate(self, template, image): ''' matchTemplate(self, template, image): \ returns - correlation value of best match (b/w 0 & 1) \ top-left coord of template for the best match (cvPoint) \ ''' matchResultHeight = image.height-template.height+1 matchResultWidth = image.width-template.width+1 #print 'matchResultHeight: %d matchResultWidth %d'%(matchResultHeight, matchResultWidth) matchResult = cv.cvCreateMat(matchResultHeight, matchResultWidth, cv.CV_32FC1) cv.cvMatchTemplate(image, template, matchResult, cv.CV_TM_CCORR_NORMED) min_loc = cv.cvPoint(0,0) max_loc = cv.cvPoint(0,0) min_val, max_val = cv.cvMinMaxLoc(matchResult, min_loc, max_loc) return {'image': matchResult , 'max_val':max_val, 'max_loc':max_loc}
def matchTemplate(self, template, image): ''' matchTemplate(self, template, image): \ returns - correlation value of best match (b/w 0 & 1) \ top-left coord of template for the best match (cvPoint) \ ''' matchResultHeight = image.height - template.height + 1 matchResultWidth = image.width - template.width + 1 #print 'matchResultHeight: %d matchResultWidth %d'%(matchResultHeight, matchResultWidth) matchResult = cv.cvCreateMat(matchResultHeight, matchResultWidth, cv.CV_32FC1) cv.cvMatchTemplate(image, template, matchResult, cv.CV_TM_CCORR_NORMED) min_loc = cv.cvPoint(0, 0) max_loc = cv.cvPoint(0, 0) min_val, max_val = cv.cvMinMaxLoc(matchResult, min_loc, max_loc) return {'image': matchResult, 'max_val': max_val, 'max_loc': max_loc}
def depthmatch(x,y,leftimage,rightimage,roi=20,buf=10,debug=False): __doc__ = """depthmatch function x,y : (int) pixel position of target in left image leftimage, rightimage : (IplImage) stereo images roi: (int) region of interest around x,y to use in matching buf: (int) buffer outside of a straight horizontal search for a match """ info = cv.cvGetSize(leftimage) width = info.width height = info.height (y1,x1,y2,x2) = (y-roi,x-roi,y+roi,x+roi) #template = cv.cvCreateImage((roi*2,roi*2), 8, 3) if y1<0: y1 = 0 if x1<0: x1 = 0 if y2>height: y2 = height if x2>width: x2 = width #cv.cvSetZero(template) # copy subregion roi x roi template_rect = cv.cvRect(x1,y1,(x2-x1),(y2-y1)) template = cv.cvGetSubRect(leftimage, template_rect) (y3,x3,y4,x4) = (y-roi-buf,x-roi-buf,y+roi+buf,width) # +/- 20 pixels in vertical direction, -20 to the right edge if x3<0: x3 = 0 if y3<0: y3 = 0 if x4>=width: x4 = width-1 if y4>height: y4 = height #cv.cvSetImageROI(rightimage, (y3,x3,y4,x4)) rightsub_rect = cv.cvRect(x3,y3,(x4-x3),(y4-y3)) rightsub = cv.cvGetSubRect(rightimage, rightsub_rect) # result matrix should be (W - w + 1) x (H - h + 1) where WxH are template dimensions, wxh are rightsub dimensions W = x4-x3 H = y4-y3 w = x2-x1 h = y2-y1 resy = (y4-y3)-(y2-y1)+1 resx = (x4-x3)-(x2-x1)+1 resultmat = cv.cvCreateImage((resx, resy), 32, 1) cv.cvZero(resultmat) # match template image in a subportion of rightimage cv.cvMatchTemplate(rightsub, template, resultmat, cv.CV_TM_SQDIFF) min_val, max_val, min_point, max_point = cv.cvMinMaxLoc(resultmat) cv.cvNormalize(resultmat, resultmat, 1, 0, cv.CV_MINMAX) depth = stereo.depth(x, x3+min_point.x, max_pixels=width/2) if debug: print "Input image: %ix%i, target: (%i,%i)" % (width,height,x,y) print "Template box: (%i,%i) to (%i,%i)" % (x1, y1, x2, y2) print "Search area: (%i,%i) to (%i,%i)" % (x3, y3, x4, y4) print "%ix%i, %ix%i" % (W,H,w,h) print "Result matrix %ix%i" % (resx, resy) print "stereo.depth(%i,%i,max_pixels=%i)" % (x, min_point.x+x3,width/2) if depth[0]: print "Depth: ", depth[0], "(cm)" #cv.cvRectangle(rightimage, cv.cvPoint(x1,y1), cv.cvPoint(x2,y2), (255,0,0)) cv.cvRectangle(rightimage, cv.cvPoint(min_point.x+x3,min_point.y+y3), cv.cvPoint(min_point.x+x3+roi*2,min_point.y+y3+roi*2), (0,255,0)) cv.cvRectangle(rightimage, cv.cvPoint(x3,y3), cv.cvPoint(x4,y4), (0,0,255)) cv.cvRectangle(leftimage, cv.cvPoint(x1,y1), cv.cvPoint(x2,y2), (255,0,0)) #cv.cvRectangle(leftimage, cv.cvPoint(min_point.x+x3,min_point.y+y3), cv.cvPoint(min_point.x+x3+roi*2,min_point.y+y3+roi*2), (0,255,0)) cv.cvRectangle(leftimage, cv.cvPoint(x3,y3), cv.cvPoint(x4,y4), (0,0,255)) if depth[0]: cv.cvPutText(leftimage, "%5f(cm)" % depth[0], (x1,y1), font, (255,255,255)) highgui.cvShowImage("depthmatch - template", template) highgui.cvShowImage("depthmatch - match", resultmat) highgui.cvShowImage("depthmatch - right", rightimage) highgui.cvShowImage("depthmatch - left", leftimage)