Signal Processing Stack Exchange
Signal Processing Stack Exchange

Questions tagged [video-processing]

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

Video processing techniques are used in television sets, VCRs, DVDs, video codecs, video players, video scalers and other devices. Many video processing algorithms include filtering and enhancements, color conversion, motion analysis, video stabilization, video mosaicking, and processing related to compression of video.

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How do the motion vectors work in predictive coding for MPEG?

In MPEG, there is a process where an image is broken up into macroblocks and a motion vector is computed for each of those macro blocks. You then transmit these vectors, along with the prediction errors, to reconstruct the next image in the video…
Wallet
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Extremely computationally intensive image/video compression schemes which offer better compression than industry standard JPEG/H.264

I am trying to search for image/video compression schemes which offer superior compression performance (holding image quality as constant) when compared to widely adopted industry standards (i.e. JPEG/H.264), but for reasons of them being either too…
Ang Zhi Ping
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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 competent in image processing compared to the…
User
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How can I perform object tracking using noisy images?

The problem Take 50+ of Lena images, add gaussian noise to them to the point that you couldn't say it is Lena. I insist, gaussian noise, not gaussian blurring. Now imagine a cropping window randomly moving around Lena's face (like a video camera…
user1637
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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 "easily enough" extract individual frames with ffmpeg,…
Laurent Duval
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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 disorienting. Besides getting a different light, is…
user19960
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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 happens when we fast forward any movie or a video…
Sufiyan Ghori
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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 white. It will be filled completely with one shade of…
user1371666
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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 quality remains the same at 2x improvement in…
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Make a Movie from Multiple Images in MATLAB

I have 10 images in the folder say "D:\images\" named as frame1,frame2,...,frame10. I want to make a movie from the color images with frame rate as per choice.Also i want to save created video file in .mp4 format at the location "D:\video\". Is it…
ramdas1989
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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 any compression basis which are non-orthogonal that…
Ang Zhi Ping
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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 in my case I have a matrix (x,y) represent the…
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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 eventually write the processed time domain output…
deboshree
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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 presence of grayscale salt and pepper noise in the…
Jack Simpson
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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 photos be used to filter the video sequence to…
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