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0answers
10 views

How to implement Gilbert Eliot Packet loss Model

I am using JM reference software to encode H.264 video with RTP header. I am trying to apply packet loss in video and want to see its impact on different video sequences. By looking at the Rtp_loss ...
0
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0answers
17 views

Controlling the pursuit path of the human eye?

The human eye scans images by panning focus along a certain path. I've read that eye tracking studies have revealed that there is a feedback process involved in moving ocular focus along a path that ...
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1answer
47 views

Extracting DCT coefficients from H.264/AVC bitstream

Is it possible to extract DCT coefficients from H.264/AVC bitstream without doing a full-decoding of the video? There are a lot of papers on compressed domain video processing which are based on the ...
3
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2answers
48 views

Why are vector quantizers not used in video codecs?

Using a vector quantizer (VQ), groups of image samples (or motion compensated and/or transformed data) can be quantized as vectors. I'm curious about why VQs are not preferred in the modern, highly ...
0
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1answer
33 views

I B P video frame reordering

I am studying H264 video these days. I know video encoder will do frame reorder for GOP with B pictures.I am not sure if my understand is correct! GOP input to encoder (it's raw data but I just map ...
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0answers
276 views

Extracting motion vectors from H.264 bitstream

I'm looking for an open-source tool/code or some guidance to extract the motion vectors (MVs) of a H.264 encoded bit sequence. I'm already aware that motion vectors can be visualized using ffmpeg with ...
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0answers
67 views

Difference between video mosaicing and video stitching

What is the difference between video mosaicing and video stitching ,is this both are similar or is there any methodology difference?
1
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1answer
95 views

HEVC Deblocking filter algorithm

I'm doing research on block noise caused by video compression (especially in newer codecs) and I've read the IEEE article about the HEVC deblocking filter (here). However, when reading the algorithm ...
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0answers
101 views

Intra refresh: periodic vc cyclic

What's the difference between the periodic and cyclic intra refresh techniques? I understand the intra refresh in general; supply intra coded information at a more constant bitrate by stretching it ...
1
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1answer
85 views

Difference Between monocular video and stereo video?

What is the difference between monocular video and stereo video ,as i am studying about motion tracking i need to know the meaning of these two things.
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2answers
46 views

Noise modeling and reduction in Video when we have just noisy video

We would like to send a video (sequence of images), we have limit bandwidth. If there is a lot of noise, the required bandwidth (bitrate) is needed to send the video+noise becomes high that is not ...
1
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1answer
68 views

How are video thumbnails chosen?

Of the thousands to millions of frames that a video might have, how is a particular representative frame chosen to be the thumbnail?
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0answers
33 views

Detecting inset images/videos from a video

I want to detect multiple rectangles in a video, each of which features a different content, but running simultaneously. This is typically seen during debates on news channels. For example, in the ...
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votes
1answer
2k views

What does the 420 means in YUV420?

I'm not sure if is the correct location for ask this question. If not please info me the correct StackExchange site. As this wikipedia page show, there is one YUV format of image as YUV420 and YUV411. ...
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1answer
2k views

Relationship between DCT and PCA

I have a basic implementation knowledge of the 2D 8x8 DCT used in image & video compression. Whilst reading about Principle Component Analysis, I can see a lot of similarity, albeit PCA is clearly ...
4
votes
2answers
230 views

Exam Question - end-to-end delay from video capture to video playout

Hi I'm preparing for my exam tomorrow and I've come across a 17 Mark question which seems trivially easy, so I think I'm missing a key point giving the rest of this exam is fairly difficult. The ...
3
votes
2answers
113 views

Video Compression - When would an average of the previous and next I or P frame be useful

I'm doing practice exam questions for my multimedia systems exam one tuesday and a topic which seems to come up frequently is the appropriate use of encoding B-frames based on: 1) the previous I or ...
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2answers
425 views

Extracting top & bottom fields from a YUV 4:2:0 Frame

I am wondering what would be the right approach to extract top and bottom fields from a YUV 4:2:0 frame. In the YUV 4:2:0 representation, Luma and Chroma samples are located as shown below: Y Y Y Y ...
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2answers
1k views

Low MIPS Video Encoder

I am looking for a low MIPS, low compression video encoder. This is for a 10fps, VGA type quality compression. What are my options? I need to be able to do this compression using a 150MHz ARM M4 CPU ...
7
votes
1answer
297 views

Extremely computationally intensive image/video compression schemes which offer better compression than industry standard JPEG/H.264

I am trying to search for image/video compression schemes which offer superior compression performance (holding image quality as constant) when compared to widely adopted industry standards (i.e. ...
13
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3answers
4k views

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 ...