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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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) ...
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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 ...
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What fiducial system should be used for a low-payload application?
I'm looking at picking a fiducial system for my image processing code. From QR to Data Matrix, there are so many choices. I would like some guidance on what system to pick and why. Here are the ...
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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.
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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 ...
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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 ...
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Best way to reach experts in the Synthetic Aperture Radar (SAR) Simulation field?
I'm looking for Synthetic Aperture Radar (SAR) Simulation experts and struggling to find them (context: synthetic data for geospatial applications).
I've found a few users in this community who could ...
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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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Extraction of reference frame information and motion vector from H.264 video files
I'm looking for tools/code for the extraction of motion vectors and information regarding the reference frame used by each macroblock with which its motion vector is calculated.
I have tried 2 tools ...
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Video-Encoding planes
I am currently developing an Android Application for Video-Streaming. Now i came to the point where I wanted to manipulate the stream. From the API I am using I have 6 methods available for each Frame ...
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Fringe movement analysis to extract displacement
I am using a Michelson interferometer with the interferogram recorded on a CMOS sensor. I have taken a video of the fringes moving when a displacement of 50 $\mu m$ is imposed to one of the mirrors.
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Remove watermark from video
Is there a process to remove a watermark ever present across all frames of a video?
I was thinking that comparing frames and taking pairs poorly correlated, could give a clue about the watermark both ...
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Defining the SNR or PSNR for color images (3 channel RGB files)
In image compression applications, I know that for an $8$-bit $0$ to $255$ level grayscale image the PSNR (peak signal to noise ratio) can be defined as:
$$
\text{PSNR} = 10 \log_{10} \frac{\sum_{m,n} ...
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Can you do temporal frequency filtering for a spatially moving signal in image sequence?
Context :
A static camera captures video footage of a still indoor environment at given framerate (1080p@30fps or 720p@60fps)
A low power line laser projects a line shaped beam in the camera field of ...
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Map time/scene differences between two similar videos
Goal:
Given two videos that are episodes from series but in different format (one Bluray/one TV for example), map the time differences between the two (which scenes are not in one of the two) and be ...
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Does anyone know of an HDMI splitter that strips HDCP 2.2?
I am working on a project that requires an HDMI signal to be stripped of HDCP 2.2. I have looked into it, and there are a few HDMI splitters that can strip HDCP 1.4, but I am yet to see any that can ...
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2D to 3D view conversion
I came across this demo by Fox sports:
https://youtu.be/N9SxFf5WCb0
Where they show a player's view in a 360 space. Very smooth and nice.
I was wondering how do they achieve it without any cameras ...
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How virtual ads work in stadiums?
I was looking at a technology which enables virtual advertisement on the perimeter ads in soccer. It's relatively an old technology for a few years back, but I'm surprised to see the quality of it. ...
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Detect non rectangular bounding box for objects
I have a short video where a TV is shown. I need to detect the TV there (let's assume it's all pure black or it's covered with a green screen), and overlay a video on top of it on the same area. But ...
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Frame lookup using audio
I'm an animator trying to get a program that will use machine learning to automate the lip syncing process. The program I need made will have two files given to it: a seed, and an audio file.
The seed ...
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Confusions regarding frame rate?
We know that when many image are shown in succession they create illusion of video
But what is the minimum rate of frame/images so that still images appear as video?
In this case, images/frames are ...
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What is the best technique for underwater imaging?
I am currently researching what the best method to take underwater images/video is. The papers I have read go into several different methods: Lidar, Synthetic Aperture Sonar (SAS), optical camera plus ...
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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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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 ...
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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 ...
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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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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
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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 ...
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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 ...
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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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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 ...
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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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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 ...
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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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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 ...
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How to Find the Probability of Kalman Filter States?
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 ...
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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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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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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 ...
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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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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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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 comes to mind stats that I have to ...
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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 ...
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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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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 ...
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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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