Questions tagged [video]

The tag has no usage guidance.

Filter by
Sorted by
Tagged with
0 votes
2 answers
43 views

What's the purpose of dividing the light and combining back in TVs?

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) ...
user avatar
0 votes
0 answers
25 views

Can I get audio version of UCSD dataset?

I request to please tell me the source through which I can access audio version of UCSD dataset. UCSD is an video anomaly based dataset. Kindly guide me in this respect. Regards,
user avatar
  • 11
0 votes
0 answers
31 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 ...
user avatar
  • 1
0 votes
0 answers
13 views

Are the sparsity of transform coefficients comparable when their frequency ranges are different?

I have obtained a graph-based Fourier transform from an optimization problem, and for evaluating the sparsity of transform coefficients, I was going to compare it with other transform coefficients ...
user avatar
1 vote
1 answer
54 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 ...
user avatar
  • 101
2 votes
1 answer
49 views

Detecting & tracking an arbitrary object in a video

I have a video from a fixed (stationary) camera. Sometimes there are slight movements in the frames (e.g. tree moving a bit in the wind). Other times, some might walk into the view of the camera, a ...
user avatar
  • 121
0 votes
0 answers
45 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 ...
user avatar
0 votes
1 answer
17 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 ...
user avatar
  • 1
0 votes
0 answers
67 views

How to calculate signal to noise ratio (SNR) for videos?

I have a reference video and the corresponding degraded video obtained by changing brightness, contrast or blurriness. I would like to evaluate the signal to noise ratio for these two videos. Further, ...
user avatar
  • 101
0 votes
1 answer
28 views

Why do we need motion vectors in MPEG?

I'm trying to understand how the encoding of a I and P Frame works. The I frame is just encoded like a JPEG image. I'v read that for the P-Frame we need to calculate some motion vectors, apply it to ...
user avatar
1 vote
1 answer
97 views

Combining Analog Video Signals for Diversity Receiver System

The system I want to build takes an analog video from two receivers (that are receiving from the same transmitter) and then combines the signals using equal gain combining (or maximal gain combining ...
user avatar
  • 13
-1 votes
1 answer
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 ...
user avatar
  • 17
3 votes
2 answers
76 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 ...
user avatar
  • 183
3 votes
1 answer
412 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. ...
user avatar
  • 183
1 vote
1 answer
25 views

Codec for forensic video

Security camera and recorder vendors tout HVEC/H265 codec support in their systems. As far as I can tell, this is the industry top-of-the-line. I’ve been using such a system for a few years now and ...
user avatar
1 vote
2 answers
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 ...
user avatar
  • 25
1 vote
1 answer
129 views

Is there any relation between QAM and streaming?

I am trying to determine whether there is any relation between QAM and streaming (e.g., video streaming). I know that QAM can be used for broadcast TV. I'm not sure if QAM is used for WiFi bit ...
user avatar
  • 11
0 votes
1 answer
377 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 ...
user avatar
1 vote
1 answer
382 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,...
user avatar
1 vote
2 answers
507 views

Converting speech audio to telephone audio

I am trying to train a machine learning algorithm on telephony speech audio. However, there isn't really enough data for this anywhere that I can find. My solution is to just use speech audio from ...
user avatar
-1 votes
1 answer
485 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 ...
user avatar
0 votes
1 answer
38 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. ...
user avatar
  • 3
0 votes
0 answers
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 ...
user avatar
  • 253
5 votes
2 answers
56 views

Does Gamma Correction Interfere with Sub Pixel Motion Estimation?

Advanced Video Coding (AVC) and High Efficiency Video Coding (HEVC) work on gamma corrected, non linear, colors. When interpolating the value at subpixels, a multi tap algorithm processes the gamma ...
user avatar
63 votes
4 answers
21k views

Why is TV static noise always black and white?

Most modern day Cathode Ray Tube (CRT) televisions manufactured after the 1960s (after the introduction of NTSC and PAL standards) supported the circuit-based decoding of colored signals. It is well ...
user avatar
  • 673
1 vote
2 answers
2k views

How to calculate transfer rate and needed bandwidth

I have two questions: 1- If I want to transfer a photo via bluetooth, how should I find how long it takes to transfer? I mean the formula between the image size, bluetooth bandwidth and time. 2- If ...
user avatar
1 vote
1 answer
146 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 ...
user avatar
  • 183
0 votes
2 answers
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 ...
user avatar
  • 109
1 vote
0 answers
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 ...
user avatar
-1 votes
1 answer
194 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 ...
user avatar
0 votes
2 answers
168 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 ...
user avatar
  • 115
5 votes
1 answer
958 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 ...
user avatar
1 vote
1 answer
5k views

How to remove wind noise from video file

I've some video footage where wind noise is drowning out background noise I want to be clear. Is it possible to do some DSP to remove/attenuate this wind noise in order to hear the engine noise? I ...
user avatar
  • 131
2 votes
1 answer
1k views

Difference between texture and illumination in image

I am new in image processing. What are texture and illumination in image? How can we define these terms?
user avatar
0 votes
1 answer
157 views

How to extract pixel-specific time-stream from mp4 video

I am interested in extracting specific timechange information from an mp4 1900x1200 20fps video.The only pixels I want to process can be found in its borders. Therefore I only need to process ...
user avatar
1 vote
1 answer
12k views

What is Typical RTP Packet size for H.264 video transmission

I am encoding my video using JM reference software. The encoded file is divided into RTP packets. I can set a RTP packet size in bytes using configuration file. But i am unable to find what should be ...
user avatar
  • 137
1 vote
0 answers
59 views

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 ...
user avatar
  • 137
-1 votes
1 answer
40 views

Tampering detection using data hiding

I am planning to do a project on data hiding using codeword substitution in encrypted video. So as an enhancement I am planning to use this data hiding technique for tampering detection, for which I'...
user avatar
  • 1
-2 votes
1 answer
188 views

How to convert HDMI to VGA through a computer using software?

I have 1 monitor with VGA input only, 1 computer with only an HDMI output, and 1 computer with a VGA and HDMI socket. I also have a VGA cable and HDMI cable. So my main question is: Could I use some ...
user avatar
3 votes
1 answer
3k views

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.
user avatar
0 votes
1 answer
337 views

Difference between ycbcr and ycbycr

I see in a paper mentioning ycbcr as well as ycbycr. I am wondering what is the difference between the two? In the figure, the first two lines show ycbycr but the two bottom lines show ycbycr?
user avatar
1 vote
1 answer
32 views

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 ...
user avatar
2 votes
1 answer
226 views

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?
user avatar
0 votes
2 answers
78 views

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. ...
user avatar
1 vote
1 answer
3k views

Hashing a video file

Bit of a long post, but this is a complex topic: I want to hash of a series of video files so that they can be quickly checked for duplication. I know that any amount of data can be reduced to a hash,...
user avatar
2 votes
0 answers
1k views

object tracking in raw h.264 compressed video

I am working on a project that requires me to detect and track a human in a live video from a webcam connected to a Beagleboard xm. I have completed this task using Opencv in pixel domain. The results ...
user avatar
  • 21
2 votes
1 answer
394 views

Is video considered a Tensor?

A sampled single dimensional signal is a vector. A sampled image is a matrix. Is video considered a rank-3 tensor since it is a set of images stacked on top of each other?
user avatar
4 votes
1 answer
2k views

Extract not blurry images from video

I need a tool or code for extract not blurry images from video (it can be used for panorama or SFM building from video) something like http://research.microsoft.com/en-us/um/redmond/groups/ivm/...
user avatar
  • 550