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Questions tagged [video]

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How to calculate the cross-correlation of two signals that have different sizes?

I have two video signals of the same video. One encoded in MPEG format and the other in H.263 format. These signals are represented in .txt files with the frame sizes in an array. I need to calculate ...
user72361's user avatar
0 votes
0 answers
9 views

Is it possible to introduce (banding, moire and other effects) on a presented video that makes it impossible to capture with an iPhone?

an absolute noob here, so possibly a silly question. I wonder if it's possible through video editing, to purposefully induce screen capture distortion effects on a video to such an extent that when ...
Akinator1234's user avatar
0 votes
0 answers
83 views

How can I combine two analogue video signals into one single analogue output?

Once upon a time desktop PCs had a 2D graphics card and a 3D graphics card. A pass through cable connected the 2D into the 3D card, which combined and outputted the two signals over layed. If I had, ...
RoboJ1M's user avatar
  • 101
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0 answers
54 views

Apply fft on video as 4D array

I working on a project called " eulerian video magnification " and i want to apply FFT on video and get the frequency response from the video . I have gotten 4D array ( frames,width,high,...
younes hajjar's user avatar
0 votes
2 answers
72 views

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) ...
Sammy Matt's user avatar
0 votes
1 answer
71 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,
TariqS's user avatar
  • 11
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0 answers
176 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 ...
Jaka's user avatar
  • 1
1 vote
1 answer
83 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 ...
bb0667's user avatar
  • 103
2 votes
1 answer
187 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 ...
pookie's user avatar
  • 121
0 votes
1 answer
63 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 ...
Daniel's user avatar
  • 111
0 votes
1 answer
46 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 ...
Marcel Herbst's user avatar
1 vote
1 answer
326 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 ...
kkuehn's user avatar
  • 13
3 votes
2 answers
122 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 ...
Tina J's user avatar
  • 193
3 votes
1 answer
875 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. ...
Tina J's user avatar
  • 193
1 vote
1 answer
32 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 ...
Jason Kleban's user avatar
1 vote
2 answers
62 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 ...
DIP_fan's user avatar
  • 25
1 vote
1 answer
168 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 ...
Enna's user avatar
  • 11
0 votes
1 answer
556 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 ...
Shakti Dagar's user avatar
2 votes
1 answer
643 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,...
Roger Sanders's user avatar
2 votes
2 answers
917 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 ...
Harry Stuart's user avatar
-1 votes
1 answer
598 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 ...
stronk_kisik's user avatar
0 votes
1 answer
49 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. ...
Bonnie's user avatar
  • 3
0 votes
0 answers
157 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 ...
skr's user avatar
  • 283
4 votes
2 answers
72 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 ...
Bruno Martinez's user avatar
64 votes
4 answers
22k 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 ...
nabulator's user avatar
  • 683
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 ...
user3486308's user avatar
1 vote
1 answer
262 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 ...
Tina J's user avatar
  • 193
0 votes
2 answers
7k 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 ...
Della's user avatar
  • 109
-1 votes
1 answer
197 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 ...
user26763's user avatar
1 vote
2 answers
230 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 ...
Dean's user avatar
  • 125
4 votes
1 answer
1k 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 ...
Jack Simpson's user avatar
3 votes
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 ...
MarkMark's user avatar
  • 151
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?
Muhammad Aslam's user avatar
0 votes
1 answer
196 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 ...
Vasilis Lemonidis's user avatar
1 vote
1 answer
14k 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 ...
james's 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 ...
james's user avatar
  • 137
-1 votes
1 answer
42 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'...
Apz's user avatar
  • 1
-2 votes
1 answer
231 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 ...
Username's user avatar
4 votes
1 answer
4k 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.
krishnakumar's user avatar
0 votes
1 answer
405 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?
user2979872's user avatar
2 votes
1 answer
34 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 ...
Léo Léopold Hertz 준영's user avatar
3 votes
1 answer
251 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?
LeviAckerman's user avatar
0 votes
2 answers
83 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. ...
Jack Simpson's user avatar
2 votes
1 answer
4k 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,...
LoveMeSomeCode's 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 ...
bunny's user avatar
  • 21
2 votes
1 answer
465 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?
user5535's user avatar
5 votes
1 answer
3k 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/...
mrgloom's user avatar
  • 560