https://github.com/tesar-tech/treman_algorithms

Algorithms for TremAn app
https://github.com/tesar-tech/treman_algorithms

image-processing matlab

Last synced: over 1 year ago
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Algorithms for TremAn app

• Host: GitHub
• URL: https://github.com/tesar-tech/treman_algorithms
• Owner: tesar-tech
• License: mit
• Created: 2019-06-11T13:53:11.000Z (about 7 years ago)
• Default Branch: master
• Last Pushed: 2020-08-26T06:37:57.000Z (almost 6 years ago)
• Last Synced: 2025-01-20T08:50:06.916Z (over 1 year ago)
• Topics: image-processing, matlab
• Language: MATLAB
• Size: 218 KB
• Stars: 1
• Watchers: 1
• Forks: 0
• Open Issues: 0
• Metadata Files:
  • Readme: README.md
  • License: LICENSE

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README

          
# TremAn Algorithms

Algorithms for TremAn app

## Center of motion algorithm

1. Convert frames to gray

2. Compute difference between frames

3. Normalize differences frames (df) from 0 to 1 (here using [mat2gray](https://www.mathworks.com/help/images/ref/mat2gray.html) function)

4. Compute center of motion (something like center of mass, but with normalized df) for X and Y coordinates.

   `centerOfMotionX = mean(A(:) .* X(:)) / meanA;`

   

   where `X` are x coordinates of all pixels in `A` (df).

5. Store this centerOfMotion for every frame.

6. Compute amplitude spectrum using fft for x and y.

7. Get max frequency from average (x and y) spectrum.

### Results for testset radim01

- sizeReductionFactor = 0.1 (algorithm works with 1/10 of original resolution)

- works same with sizeReductionFactor = 0.01 

video | real freq [Hz] (counting swings) | freq from acc [Hz]|result freq [Hz] (algorithm)

---------|----------|---------|-------

MV1.mp4 | 12 sw/5 s = 2.4     | 0* | 2.36  

MV2.mp4 | 40 sw/14 s = 2.86   | 2.86 | 2.87  

MV3.mp4 | 70 sw/17 s = 4.12   | 4.06 | 4.07  

MV4.mp4 | 90 sw/16 s = 5.625  | 5.48 | 5.63  

MV5.mp4 | 93 sw/16.5 s = 5.64 | 5.56 | 5.57  

MV6.mp4 | 45 sw/17.3 s = 2.54 | 2.52 | 2.61  

*data are too short and signal is too low, probably does not fit the video.

#### results for COM algorithm

![mv1](media/img_result_centerofmotion_MV1.mp4.png)

![mv2](media/img_result_centerofmotion_MV2.mp4.png)

![mv3](media/img_result_centerofmotion_MV3.mp4.png)

![mv4](media/img_result_centerofmotion_MV4.mp4.png)

![mv5](media/img_result_centerofmotion_MV5.mp4.png)

![mv6](media/img_result_centerofmotion_MV6.mp4.png)

### Current limitations

- Doesn't work for chessboard videos (difference is too sharp )