Questions tagged [video-processing]
Algorithms for processing video signals i.e. sequence of images either for enhancements, conversions or analysis of objects within it.
102
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15 views
How to find the sampling vector of HD camera recording?
An HD camera records 1080p video (1080*1920, prograssive, 30 frames/sec) wiht croma subsampling 4:2:0 for a total of 90 minutes. The quantizer which is being used for the chroma representation has 256 ...
2
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2answers
17 views
Is it possible to calculate/estimate the storage space a certain duration of .mp4 video files will take up?
Is it possible to calculate/estimate the storage space a certain duration of .mp4 video files will take up? I have the resolution (eg. 4000 X 3000), the format (H.264 or H.265), the audio format (AAC) ...
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0answers
23 views
Do backgroundSubtractor functions in opencv only detect moving objects?
There are some backgroundsubtractor functions in opencv like backgroundsubtractormog2 , backgroundsubtractorGMG and ... . It seems that these functions only detect moving objects in a video and fixed ...
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0answers
26 views
Algorithm for smoothing the output of an object detector operating on a video?
Please could you point me towards an algorithm that takes a series of object detections performed on a frame by frame basis as input and outputs a filtered series of object detections in which the ...
1
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1answer
51 views
How to calculate bitrate of PAL?
I have to calculate the bitrate of PAL format $\ (576*720) $. I have the following data:
$\ 25 $ frames per second
Interlaced
Interior representation is: $\ 4:2:0 $
$\ 8 $ bpp
I have tried the ...
1
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0answers
37 views
Fast and Slow motion video detection using Optical Flow
I'm trying to calculate a "video motion" value in a given video sequence, meaning how fast or slow motion the video is. For instance, if a video is about a car racing, the value is high. Whereas if ...
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0answers
25 views
Board to “Patch” HDMI signal
I'm looking for hardware that allows me to take an existing hdmi signal, alter some pixels (for example, set the center pixel to red) and output the signal to an arbitrary HDMI television. The whole ...
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1answer
63 views
Alternate Octave Commands for Matlab
can you tell me how to write video data to file..
what is the alternate of these 4 commands in octave
...
6
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0answers
67 views
Converting very short “motionless” video frames to single, better-resolved, images
I made a mistake with my newly bought compact camera, before a trip to Japan. Instead of taking single pictures, I ended up with a few short "MP4" video files (1 second, 2-3 frames). I could "easily ...
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0answers
151 views
FFmpeg Block Motion Compensation Only
is there a way to just perform block motion compensation using ffmpeg command line (i.e. no addition of residual encodings). I want to compare the quality of the video frames produced using various ...
0
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2answers
86 views
Correlation between 2 signals of uneven dimensions
As a part of my work, I am trying to correlate the audio signal in a video with the pixels of each frame. The steps I follow are:
Audio sampling rate and frame rate of the video are known. So, ...
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0answers
292 views
Detection of Video Quality Using Python
I am getting started with image/video processing. As a start I have a dataset for which the goal is to detect the quality as the video progresses.
Based on my readings I think any video under test ...
1
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1answer
204 views
RF demodulation for dummies
Given a signal that's been FM encoded on a carrier wave, what are the individual steps I need to take to demodulate it, and recover the original signal?
I don't have a background in signal processing,...
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2answers
135 views
Interpolation of audio for new frames
I am trying to upsample a video by existing frame interpolation techniques. In the process, I realize that I also need to interpolate the audio signal for the new frames so that the audio signal is in ...
-1
votes
1answer
177 views
How can I convert raw pixel data to AVI video?
I have series of gray-scale 8-bit frames and I want to convert them into AVI video. How can I do this? Is there any existing converting utils or products for this type of task? I even do not ...
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1answer
65 views
Decoding a video signal, how to get frame output to matrix for calculations?
I'd like to use python to take a video (eventually a stream) and map each frame to an RGB array of pixels.
My first thought was to use ffmpeg bindings, and in memory (if possible) convert it to png ...
0
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1answer
334 views
How to find the probability of Kalman filter states? [OpenCV+Python]
I am working on a video object tracking problem. I am using Kalman filter to predict and correct the object position return by an algorithm such as CamShift. I want to adjust the likelihood ...
0
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1answer
35 views
How we can show that 2 correlated videos are similar?
Can I tell that different versions of the same video are correlated to each other?
and if so, how can I show this correlation? for example,
high-quality and poor-quality versions of the same video.
...
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0answers
43 views
Is signal processing used in block matching algorithms
I'm working on a custom video codec which uses the standard mean squared error to find blocks.
As explained by this youtube video you choose a search area size to find a block in. Each pixel of the ...
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2answers
406 views
How can I remove flickering background in a video?
I have a black and white video taken with a high speed camera and I notice a background flickering coming from my LED light. The images alternate from dim to bright and it makes the videos quite ...
0
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0answers
139 views
API/ Library for re-orienting 360 degree camera frame efficiently
I am trying to correct the orientation of a 360 degree camera frame using roll, pitch and yaw estimates coming from my C++ Extended Kalman Filter (EKF) code. I am interested in using libraries and ...
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1answer
120 views
How to use optical character recognition program to read coins? [closed]
I had a friend that goes through my pennies trying to find valuable rare pennies. Instead of looking at each one could a optical character recognition program be used to flag coins?
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1answer
45 views
How to recognize for small video sequence with a large sequence?
I'm working on the idea of recognizing a small video sequence (a sequence of 18 seconds) within a long one (a sequence of 15 minutes), the first idea that come to mind stats that I have to ...
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1answer
140 views
temporal high-pass filtering to approximate phase derivative
I am currently following the algorithm as based on a previously published research article "A Motion Detection Algorithm Using Local Phase Information" by Lazar et al. The basic overview of the ...
1
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1answer
74 views
Video processing to detect a logo in frames
I am trying to detect a TV channel logo inside a video file, so simply given an input .mp4 video, detect if it has that logo present in all (or most) of frames or not (or maybe what percentage of ...
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2answers
4k views
Does the cv2.waitKey argument determine the frame-rate while capturing a video?
Kinda new to image processing, so pardon me if the question is too stupid.
Using the library cv2 in python to capture video from my webcam, which, so far as I can see as a programmer, is basically ...
0
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1answer
617 views
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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0answers
35 views
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 ...
1
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1answer
44 views
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 ...
3
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0answers
102 views
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 ...
3
votes
1answer
2k views
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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0answers
98 views
Shot boundary detection using SVM's
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 ...
0
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1answer
178 views
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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0answers
43 views
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:...
3
votes
1answer
57 views
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 ...
0
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1answer
718 views
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 ...
0
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2answers
102 views
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 ...
2
votes
1answer
102 views
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 ...
2
votes
1answer
458 views
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 ...
0
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1answer
349 views
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 ...
5
votes
3answers
7k views
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 ...
2
votes
1answer
6k views
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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1answer
544 views
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 ...
0
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2answers
2k views
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 ...
1
vote
1answer
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 ...
0
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1answer
78 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 ...
0
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1answer
136 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? ...
8
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2answers
190 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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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 ...
2
votes
1answer
840 views
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 ...
