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# Questions tagged [motion-estimation]

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### How do the motion vectors work in predictive coding for MPEG?

In MPEG, there is a process where an image is broken up into macroblocks and a motion vector is computed for each of those macro blocks. You then transmit these vectors, along with the prediction ...
951 views

### Create images with sub-pixel shift

I want to test some motion estimation algorithms which compute motion with sub-pixel accuracy. I can create images shifted by the order of pixel (e.g. [2,2]) using ...
106 views

### What motion estimation techniques that could estimate the motion of every pixel?

I'm trying to estimate a motion from a video, however based on my finding, those methods usually meant for large motion and sparse in nature. Optical flow: Sparse and fail to detect sub-pixel motion ...
34 views

### Does Gamma Correction Interfere with Sub Pixel Motion Estimation?

Advanced Video Coding (AVC) and High Efficiency Video Coding (HEVC) work on gamma corrected, non linear, colors. When interpolating the value at subpixels, a multi tap algorithm processes the gamma ...
236 views

### Obtaining Correct (Least Squares Sense) Affine Transform Parameters Between Two Images

I have two images that I want to compute the affine motion model parameters. The model that I use is $$x' = a_1x+a_2y+a_3$$ $$y' = a_4x+a_5y+a_6$$ To calculate those 6 parameters, I picked 6 points (...
670 views

### Possible ways to determine the direction of moving object?

I'm trying to determine the moving direction of an object in x-axis only. Figure below shows part of my effort. However, I got stuck. As you can see from the middle image, the green represent the ...