How to find the next position of an object in an image based on the displacement of nearby objects?

Question

Meera chandran 2018-9-9

0
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/418247-how-to-find-the-next-position-of-an-object-in-an-image-based-on-the-displacement-of-nearby-objects

回答： Image Analyst 2018-9-9

I have 2 images, or let's say 2 frames( first one: reference image) obtained from a shaky video. The second frame is different from the first because of the vibration/shake. I want to find the pixel position of an object in the 2nd frame using the displacement/ distance between the pixels of other objects(like some markers) in these images.

What I did is I calculate the distance between the pixel positions of selected points in the 1st and 2nd images(same objects). But this distance are not the same and i cannot make an equation using this distance to find the (x2,y2) co-ordinates of the required object. How can I proceed further?

%%Input video file which needs to be stabilized.
filename = 'SS-75_zoom_Trim.mp4';
videoFReader  = vision.VideoFileReader(filename, ...
                                 'ImageColorSpace', 'RGB',...
                                'VideoOutputDataType', 'double');
%Create a video player object to play the video file
videoPlayer = vision.VideoPlayer;
img1=step(videoFReader); % obtain the first frame
img2=step(videoFReader); % second frame
figure;
imshow(img18);
[Ax,Ay] = getpts; %select points in image 1
figure;
imshow(img19);
[Bx,By] = getpts; %select the same point sin image 2
for i=1:3
 dis(i) = hypot((Bx(i)-Ax(i)), (By(i)-Ay(i))); % calculate distance 
end