Questions tagged [video-processing]
Algorithms for processing video signals i.e. sequence of images either for enhancements, conversions or analysis of objects within it.
119
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1answer
39 views
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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0answers
16 views
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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0answers
20 views
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 ...
0
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1answer
47 views
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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0answers
19 views
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 ...
0
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1answer
14 views
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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2answers
113 views
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.
...
1
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1answer
56 views
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 ...
1
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1answer
656 views
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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0answers
30 views
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 ...
2
votes
1answer
64 views
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 ...
-1
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1answer
3k views
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 ...
3
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2answers
66 views
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 ...
3
votes
1answer
296 views
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. ...
0
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1answer
366 views
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 ...
3
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0answers
64 views
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 ...
1
vote
2answers
58 views
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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0answers
34 views
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 ...
2
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1answer
24 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) ...
2
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0answers
153 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
242 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
44 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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1answer
336 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
...
7
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0answers
120 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 ...
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0answers
250 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 ...
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2answers
118 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
716 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
368 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,...
0
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2answers
394 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 ...
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1answer
466 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 ...
0
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1answer
88 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 ...
4
votes
1answer
472 views
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 ...
0
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1answer
37 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
49 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 ...
6
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2answers
1k 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
145 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
251 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?
2
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1answer
67 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 comes to mind stats that I have to ...
1
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1answer
194 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
128 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
6k 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
1k 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 ...
1
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0answers
37 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
47 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
99 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 ...
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1answer
192 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 ...
0
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0answers
45 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:...
5
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1answer
137 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 ...
