How to track certain points in a moving object through a video ?

Question

Amr 2015-3-24

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/185013-how-to-track-certain-points-in-a-moving-object-through-a-video

回答： Dima Lisin 2015-3-25

5SURF.jpg

Hi, I am trying to make a code to detect moving hose during a video taped experiment. I need to select certain points in this hose and detect them through the video. I have attached a frame of the video I have. The hose is detected through LED strip, is there a function that can allow me to select certain points of the hose in the picture from first frame and detect them through the entire video so that I can calculate the movements in pixels ? In my code I am using SURF features detection and select strongest 5 points but even then I can not find a way to track those 5 points through the video. Appreciate your advice, my code is as follows;

clear;
clc;
% Image aquisition from Video and converting into gray scale
vidIn = VideoReader('ItaS.mp4');
%%Load reference image, and compute surf features
ref_img = read(vidIn, 1);
img = rgb2gray(ref_img);
%imshow(img)
ref_pts = detectSURFFeatures(img);
[ref_features,  ref_validPts] = extractFeatures(img,  ref_pts);
figure; imshow(ref_img);
hold on; plot(ref_pts.selectStrongest(5));
cuba = ref_pts.selectStrongest(5);
stats1 = round(cuba.Location);
bw = double(stats1);
bw1 = bwlabel(bw, 4);
stats = regionprops(bw1, 'Centroid','BoundingBox');