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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Measure the amount of drift in video and audio frames
I setup a stereo system using 2 GoPro Hero Session Cameras, since I need a larger baseline than the one of the Dual Hero System.
This unfortunately means the two cameras are not ...
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Identifying license plate number of a thief's car from a Picture [closed]
I recently had the mail in my mailbox stolen from my home. I caught the whole thing on video and was able to identify the woman. Just a few days after the mail theft incident I went into a local post ...
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Video stitching for static scene (infinite loop video)
I have a video that is a panoramic video of a static scene. Just to be clear, I am not talking about a spherical 360° degree video but a video that starts in some direction and then does a full 360 ...
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Video: Who crossed the finishline first?
Okey, so there was a boat race during the weekend. It was a very tight race, but a few minutes after the race, the green boat was declared winner.
Given only this video images, how can they ...
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Video stabilization using Lucas-Kanade method
I got an assignment in a video processing course - to stabilize a video using the Lucas-Kanade method. Assuming the matlab code I wrote for performing LK on 2 images works (i.e, I can get the optical ...
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Classify Different Video Frames by the Effect
I'm trying to do shot boundary detection using SVM's.
I'm differentiating between 3 shots, cut, fade and dissolve + (normal frames).
I had used two features, shannon's entropy and variance, it gave ...
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Want to do shot boundary detection via SVM, what are some good features?
I want to do shot boundary detection via SVM's.
I'm dividing the frame into nxn blocks. Per block I'm finding these features:
shannons entropy
edges (H,V,Diag)
standard deviation
for consecutive ...
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Looking for a file format for lane detection
I am trying to extract lane boundary lines from two recorded video cameras on the sides of the vehicle. I would ultimately like to calculate lane position from those boundaries.
My thought process is:...
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How Can an Object Move by Less Than a Pixel Between Two Consecutive Frames?
I think video is a series of picture frames. Consider a black & white scenario (no RGB). A picture frame is a 2D array of pixel. Each pixel has a single color.
A pixel can't be half black or half ...
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How to find Sampling frequency of a video signal
i took the Digital Image processing subject in college and i am a little confused that how i can find out sampling frequency of a video signal given its bandwidth. For example what will be the ...
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Video compression - why not just sending the changed parts?
I'm trying to understand how video compression through dense optical flow works (I'm a newbie with video compression).
I easily understood what optical flow is, the thing I can't understand is why a ...
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Pixel Wise Write into a Video File in MATLAB
A video file (in .ptw format) is read in MATLAB in the form of a 3 dimensional matrix (a structured format). My aim is to process the video in time domain on each coordinate pixel individually and ...
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How to Reduce Noise in a Video Stream?
I've been using Open Broadcaster to stream the infrared HDMI output from a 4K Sony video camera. It works pretty well, but one thing that I'm finding a little annoying for image analysis is the ...
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OpenCV camshift algorithm
I got a lab report to make in an image processing course in my university, and I was asked a question about the OpenCV camshift algorithm (for video tracking):
the camshift algorithm works on the hue ...
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Can deep learning be applied to video compression?
H.265 is based on incremental gains over time. The paradigms have largely remained the same. What are the odds of deep learning providing huge performance gains? Here is the main metric:
Perceptual ...
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What is difference between the terms bit rate,baud rate and data rate?
Let us consider any video signal. Bit rate of a video signal is the no of bits per frame per second. Also, data rate is the no of bits per second. Baud rate is the number of signal changes per second....
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Extract the count of particular macro block types(I, P and S) from the frames in the video
How can I extract the count of particular macro block types(I, P and S) from the frames in the video (H.264 and MP4)?
Also, I would like to extract the prediction residual of each of the P and B ...
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How to sync audio and video signals in MATLAB?
I have a video clip that has a frame rate of 25 fps (MJPEG compression) and an audio clip with a sample rate of 48kHz. Both of them play for the same duration - 27 seconds.
Is there any standard way ...
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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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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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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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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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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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Real Time Depth Estimation in MATLAB
I want to estimate depth from live video stream with two calibrated webcams in MATLAB but has no results. I have Webcam Support Package and Image Acquisition Toolbox but I don't know how to use live ...
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Depth estimation from live video stream in matlab
I want to estimate depth from live video stream with two calibrated webcams in matlab but has no results. In this post depth is estimated with two recorded video files. how can I estimate depth in ...
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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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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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What is the state-of-the-art of using signal-processing for "cleaning-up" videos?
TWO PART QUESTION - We've all seen the movies/TV shows where the police/feds/spies use computer software to take a grainy photo and do a "clean-up" to see a better picture and more details. I assume ...
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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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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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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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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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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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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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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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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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Image processing for eye movements
I have series of images extracted from a eye tracker video for both eyes.
is there any image processing algorithm/method/technique available to find the following from those images:
Horizontal eye ...
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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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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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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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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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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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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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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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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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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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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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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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.ptw Video conversion
On Video recording with IR camera, a file in .ptw is obtained. I want to analyze the file using standard software, like MATLAB. However, video processing in MATLAB requires the file to be converted to ...
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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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