Questions tagged [video-processing]
Algorithms for processing video signals i.e. sequence of images either for enhancements, conversions or analysis of objects within it.
127 questions
2 votes
3 answers
1k views
Should we call .mp3, mpeg, mp4, etc are a kind of source coding in telecommunications?
I would like to ask you guys that I learned the Shannon Coding, Fano coding, Huffman coding are a kind of source coding. So may I call the mp3, mp4, mpeg are a kind of source coding? Thanks so much
0 votes
0 answers
39 views
How to Calculate YUV-PNSR
I am using tools like VVenc and UVG266 and doing some test to encode some different yuv files. VCCenc gives me results for (Y-PSNR U-PSNR V-PSNR YUV-PSNR), but UVG266 gives me only (Y-PSNR ...
- 101
0 votes
2 answers
42 views
Aggregating Image Stream (Video) to Audio in Real-Time
For the simplicity, aggregation technique is just averaging (pooling) entire grayscaled image pixel into one amplitude. So, in other word the camera is acting as light sensor, where more white pixel ...
2 votes
2 answers
782 views
Seeing perfectly camouflaged objects
Consider a perfectly camouflaged object which perfectly mimicks the texture of its surrounding. One can see the object and its shape only when it moves - otherwise it is completely invisible. When ...
1 vote
0 answers
53 views
No prior research? What am I not understanding? Using deep learning to enhance videos by predicting the best filters or histogram transforms to apply
I would like to make a large set of videos more visually pleasing by adjusting colors, saturation, contrast, etc. However, the techniques that I can find online roughly fall into these two categories: ...
- 111
2 votes
0 answers
29 views
Defining the PSNR for images in CIE-LUV or CIE-XYZ or CIE-HCL spaces
In image compression applications, we know that for an 8-bit 0 to 255 level grayscale image the PSNR (peak signal to noise ratio) can be defined through the MSE as: $$MSE=\frac{1}{mn}{\displaystyle \...
- 121
4 votes
1 answer
96 views
Video Alpha Matting
I'm looking to composite an opaque object (e.g. 3D art) into video footage of semitransparent fog/clouds before a landscape background so that the object seems immersed in the clouds but occludes the ...
- 41
1 vote
4 answers
114 views
How can I analyse the motion of plasma
I am currently attempting a project of plasma analysis. One of the aspects of this project is to determine the stability of the plasma, when a plasma is unstable it loses its shape partially or starts ...
- 13
0 votes
2 answers
92 views
What's the purpose of dividing the light and combining back in TV Cameras?
This is usually a two-part, trichroic prism that divides the light into separate red, green, and blue beams, each of which is detected by a separate CCD or CMOS image sensor. A circuit (3) ...
1 vote
1 answer
467 views
Relationship between fps and time stamps
I am getting a bit confused about fps (frame rate) in a video. I build a video (using python and opencv) using 600 frames and I specify 10 fps. However I want to also record the timestamps for each ...
- 133
4 votes
1 answer
685 views
Difference between frame and image?
This term'Frame' is often used in image processing for frame rate, but is there any difference between an image and a frame?
- 83
1 vote
1 answer
1k views
My fft gives always gives the correct frequency or double the correct frequency
I will do anything to get help. Please help me find a solution. I can safely say that my fft algorithm, implemented with pyfftw, works as intended when a sine wave with a certain frequency is passed. ...
- 11
1 vote
1 answer
88 views
When a face collapses into a swirling black hole on a video conference call like this is it due to some advanced AI-based error-correction gone wrong?
Within this newscast video1 a video conference call is shown. Between 02:23 and 02:37 the face of the interviewee appears to get ...
- 241
0 votes
0 answers
229 views
Convert h264 to VFR mp4 with duplicated frames/timestamps
I have a .h264 video file with a separate text file containing timestamps for each frame in timestamp v2 format. Where the ...
- 1
1 vote
1 answer
97 views
Difference H264 and H265 algorithms
I try to understand difference of H264 and H265 video compression algorithms. However, I confused the algorithms of uses in H264 and H265. In addition, I found a few differences between these two ...
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