Questions tagged [video-processing]

Algorithms for processing video signals i.e. sequence of images either for enhancements, conversions or analysis of objects within it.

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2k views

Calculate sum of absolute difference per pixel

I am trying to implement a research paper just to verify my results. I have shared the code (written by me) and the description of the process given in the research paper. Unfortunately my results are ...
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77 views

Hardware advice for machine vision project

I am working in facial feature detection in video images. I was hoping to get some general advice about camera/lens technologies to determine if I can upgrade my camera/lens. Basically, the problem ...
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133 views

Count the vehicles flow that pass over one bridge

I live in an apartment near a bridge. From my window I can see the cars traveling over the bridge as you can see below: Is there a relatively simple manner to count each car pass over the bridge? ...
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2answers
182 views

Identifying license plate number of a thief's car from a video

Motivation: I recently had my laptop stolen, with lots of pictures of my family, research work and other very important stuff. Of course the theft has been reported, but I think people here are more ...
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1answer
801 views

Lip sync over IP

What are the most used techniques for lip sync (audio/video sync) for conferencing over IP (and related issues with playout buffering)? I could find a lot of paper about audio intrastream ...
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1answer
406 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 ...
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1answer
103 views

How to increase the resolution of a video from a sequence of photos?

I have a video filmed in a relatively low quality and resolution and a sequence of photos of higher quality taken of the same scene at the rate of about one image every two seconds or so. Could those ...
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0answers
43 views

How to specify 2-D coordinates of an object in matlab?

This is the scenario: I marked two axes (figure below) on a board and a camera(global vision system) sees the board. I want to make the vision system to recognize $X$ and $Y$ axes and specify ...
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185 views

Optical Flow Problems

I was wondering if any of you guys could help me with the next 3 problems. They're about estimating the lamda on the Optical Flow equation $E = E_s + λE_c$, for different situations that try to ...
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53 views

Is there a way to see video after applying packet loss

I have encoded a video stream using JM using RTP. Then i have applied rtp_loss on it but after that i am unable to decode video. Like in this example a video with different packet loss percentages are ...
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2answers
653 views

Map time difference between two similar videos

Question: Is there any software, source-code, or well documented and easily implementable research (I am not afraid for a little bit of Python) to do the following: Take two similar videos from ...
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1answer
876 views

Simulate packet loss in internet video streaming

i have encoded H.264 video using ffmpeg . I want to apply packet loss model like Gilbert Eliot model to depict video transmission over unreliable network. Like in this thread TV noise is simulated. ...
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1answer
1k views

Detect ending of frame in H.264 video stream

I am using JM reference software for encoding and decoding of video. What I want to do is to add Redundant bits using RS codes to the encoded video so that if some bits get lost during transmission we ...
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43 views

Matching two video conversations

I have two video where two person having conversation. They begin recording different times. I want to match these two videos' frame numbers, i.e. By matching audio. How can I do that?
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38 views

Accurate measurement of object's position on a bayer-filtered and grayscaled images

This is an experience-related question about cameras and image processing. I have a laboratory setup. Under some simplifications it looks like a red ball rolling on a white table (the real setup is ...
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1answer
435 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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152 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?
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2answers
715 views

Counting human movement of exercise using ROI or pre-set passing line with OpenCV

I'm currently doing my final year Degree in computing studies. The project I'm working on is a video of a webcam or computer webcam to have 2 pre-defined ROI (Region of Interest) on top and bottom ...
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1answer
144 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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74 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 ...
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1answer
2k 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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1answer
674 views

Why does cel-shading sometimes look similar to rotoscoping?

Why does cel-shading sometimes look similar to rotoscoping? Rotoscoping: A Scanner Darkly: Cel-shading: Wikipedia: Cel-shading, Teapot Example:
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3k views

Is it possible to have negative PSNR?

I have been working on image processing. I have an image and then add it a Gaussian noise with standard deviation=0.005. then using averaging filter to denoise it (I know it is not a good idea). then ...
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1answer
30 views

Find large distinctions in Video

Assume you have 77777 pictures that are mostly noise. They are about magnetic anisotropy. There is one picture among these pictures which has high contrast difference between two large areas (some ...
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52 views

Is it correct to call this Gaussian Mixture Model?

Some poeple claim their background subtraction algorithms use Gaussian Mixture Model, but when I read the code, I find they actually use only one component, and as a result EM algorithm (or its ...
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149 views

Equivalent of the Shepp-Logan phantom for video denoising

The Shepp-Logan phantom is a standard test image used in reconstruction algorithms as well as image denoising. Does an equivalent image sequence exist for testing video denoising algorithms? I know ...
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1answer
118 views

Video: Detecting a digital timer and when it ticks

Input: A video with a digital timer, possibly several hours long, such as this video. The timer might use any font or color, and might be located anywhere on the video, but it probably won't fill the ...
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2answers
76 views

Detecting characters in high contrast/oversaturated regions

I'm currently tagging insects with reflective tags and filming them in night-mode on my camera which has an infrared light. I have some markings on the tags which I need to catch on film. ...
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52 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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2answers
2k views

Detecting scene transitions in a video

How would you reliably detect scene transitions in a video? The simplest case wouldn't be too hard, but sometimes it might be a fast moving scene, or there might be an effect like lightning that would ...
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1answer
121 views

Image and video processing in matlab

I have been working on Digital signal processing since Feb-2013. I have good command over it. Now I want to expand work in field of IMAGE and Video processing. Please suggest me best practical guide ...
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37 views

Please suggest me good algorithm for video segmentation based on changing background?

Iam having 1 min video.I need to cut the video into 5 segments depending on changing background.Please suggest me good algorithm which can be easily implemented in matlab.Please provide me helpful ...
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1answer
52 views

Why do we observe band when recording CRT monitors or Flouroscent lamp via video recorder?

I understand that this has something to do with difference between refresh rate of monitor (or line frequency used by the ballast in case of Fluoroscent lamp) and frame capture rate of video recorder. ...
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1answer
976 views

Hashing a video file

Bit of a long post, but this is a complex topic: I want to hash of a series of video files so that they can be quickly checked for duplication. I know that any amount of data can be reduced to a hash,...
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1answer
310 views

Is there a way to evaluate block size when doing image processing or video processing

I am currently doing foreground segmentation in image sequences. A DCT 8 by 8 feature is extracted for each pixel. Now i want to explore dynamic block size for different scenes. Is there any rules ...
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59 views

User-friendly DSP for high-frequency application?

I've been doing some work with creating visual output on oscilloscopes using audio; here are some examples: http://www.youtube.com/watch?v=UJ8-vySqEAI This is using Max/MSP to read from a buffer of ...
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1answer
95 views

Estimating degree of motion in video frames

I have a video (in webm format), and I want to produce a graph that shows the degree of motion in this video as a function of video time. I'm sure there are many different ways to define "degree of ...
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2answers
9k views

Remove background from image

I want to remove the background from image. Let's say I have this background: . Then I put pen drive and tippex on it. . Is it possible to remove the background image from second image? If so, ...
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1answer
2k views

How to process video with DFT/FFT - getting the frequency of green color changes?

Goal: I have a video stream from a webcam. I need get frequency of the green color changes on the video. Video color space is RGB The signal looks sinusoidal with a frequency range 0.5 - 2.4 Hz I ...
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36 views

How can I improve my motion capture system?

Please excuse me if this is not the proper place to ask this. I just need some general advice. I have set up a very basic homemade motion capture system where I put three TrackIR cameras from ...
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0answers
975 views

Calculate total bit rate

I want to calculate the total bit rate of a video system. In order to calculate the total bit rate for a 1080/50p video system(4:2:2) we need: ...
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1answer
178 views

Representation of frame image pixels

In paper Human identification using gaits Section 3.2, the authors explain how to represent a 3D image (x,y,t) into 2D image with (x,t) ; (y,t) denoted 1D signals. I have a conceptual doubt which is ...
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1answer
89 views

Can anyone suggests some basic readings for video processing?

Actually, I am new to this field and would like to work on a project in Video processing. I have a little background in Image processing but would like to study further in video processing. So, If ...
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1answer
1k views

What happens when we Fast Forward the Video

I've been involved in Image Processing kind of project for the last couple of month, before which i had no experience in Image processing. While filtering the image today i had a thought what exactly ...
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1answer
89 views

Projection of 2D signal

Paper describes that a 2D signal(say video) can be projected to 1D for time series analysis by using a transformation function fx=Ax+constant and ...
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2answers
895 views

differences in fundamental frequency/pitch between music and speech

I am developping a program, that extracts very expressive frames from a video (meaning: frames, which could summarize a video) for a university seminar. One of my ideas was, to analyze the audio data (...
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1answer
1k views

Matlab video processing of Contracting tissues. how to analyze movement?

I'm trying to write a code The helps me in my biology work. Concept of code is to analyze a video file of contracting cells in a tissue Example 1 Example 2: youtube.com/watch?v=uG_WOdGw6Rk And ...
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1answer
441 views

Non-orthogonal basis which offers better energy compaction in image compression

I am aware of image-independent basis, i.e. DCT, and image-dependent basis, i.e. Karhunen–Loève, which are used in compacting energies for image compression. These bases are orthorgonal. Are there ...
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118 views

Slow Scan TV Documentation

I am looking for information on how to decode slow scan TV signals, which is a method of transmitting static images using everyday FM radio. I have seen software but I don't understand how to start. ...