# Tag Info

### Extracting motion vectors from H.264 bitstream

I think the following code can help you: https://github.com/vadimkantorov/mpegflow The main idea is that you need to decode frames first and query motion frames by calling ...
• 151

### Detecting moved and dirty areas between two snapshots/images

I love abstract art. It speaks to something inside of me that is outside the library, it speaks in words but not words. One of my favorite artists is Wassily Kandinsky. An image of his that could ...
• 123

### Optical flow equation and real images

Writing the optical flow vector as $(u,v)$, then the optical flow equation only states that light is preserved. Basically, it states that variations in the observed light patterns (measured by the ...
• 3,889

### OpenCV Motion Analysis: Optical Flow vs Motion History

Farneback is a dense optical flow algorithm. This means, it outputs the flow vectors per each pixel (which can be tracked). LK is a sparse variant, tracking only certain feature points. The motion ...
• 5,187
1 vote

### Correlating accelerometer data

Motion can be described using displacement with time, velocity or acceleration. To get these quantities from the accelerometer data the following link may help. http://www.chrobotics.com/library/accel-...
• 21
1 vote

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

If your images are as clear (I specify clarity here because it is easy to threshold in this case) as your examples here, one easy way of computing the direction vector of a moving object would be to ...
• 451
1 vote

### Motion detection one threshold over dataset

I could suggest several things. I am not sure if you already try them and I am not sure of the requirements either. Assuming that you need real-time analysis and performances: What about normalizing ...
• 261
1 vote

### how to detect and capture scene change in a recorded video

You may use Low Rank Models for Video Background Subtraction as a pre processing. Once you leave out the background even simple methods will do to discern any motion.
• 458
1 vote

### how to detect and capture scene change in a recorded video

You can check the source code of ready-to-use project for this goal at https://github.com/Breakthrough/DVR-Scan and https://github.com/Breakthrough/PySceneDetect. Some tutorial links can be found in ...
• 111
1 vote
Accepted

### Algorithm to effectively find perspective transform in motion estimation

Assumptions From your question, I assume you already have an algorithm that does produce the transformation you want, but you have to play with the parameters manually. Proposed solution First, ...
• 1,676
1 vote

### Algorithm to effectively find perspective transform in motion estimation

The suggested technique seems to be to gather points of interest, calculate a feature vector for them, and then find matching pairs of points in both images, followed by a calculation of the transform....
• 113
1 vote

### Extracting motion vectors from H.264 bitstream

Try https://github.com/jishnujayakumar/MV-Tractus. This tool will give you motion vectors in the form of JSON for every frame.
• 11

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