Questions tagged [video]
The video tag has no usage guidance.
47
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64
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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 ...
- 683
4
votes
1
answer
4k
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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.
- 85
4
votes
1
answer
3k
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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/...
- 550
4
votes
2
answers
68
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 ...
- 143
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 ...
- 193
3
votes
1
answer
248
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?
- 141
3
votes
1
answer
5k
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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 ...
- 151
3
votes
2
answers
118
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 ...
- 183
3
votes
1
answer
768
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. ...
- 183
2
votes
2
answers
796
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 ...
- 153
2
votes
1
answer
166
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 ...
- 121
2
votes
1
answer
552
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,...
- 121
2
votes
1
answer
33
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 ...
2
votes
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,...
- 121
2
votes
1
answer
451
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?
- 44
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?
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 ...
- 21
1
vote
1
answer
161
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 ...
- 11
1
vote
1
answer
81
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 ...
- 103
1
vote
1
answer
266
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 ...
- 13
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 ...
- 163
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 ...
- 25
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 ...
- 137
1
vote
2
answers
214
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 ...
- 125
1
vote
1
answer
245
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 ...
- 183
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 ...
- 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 ...
- 137
0
votes
1
answer
43
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 ...
0
votes
2
answers
71
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) ...
0
votes
1
answer
51
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 ...
- 111
0
votes
1
answer
531
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
...
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 ...
- 109
0
votes
1
answer
191
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 ...
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 ...
0
votes
0
answers
48
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, ...
- 101
0
votes
0
answers
44
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,...
0
votes
1
answer
62
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,
- 11
0
votes
0
answers
162
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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0
votes
1
answer
5k
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Does anyone know of an HDMI splitter that strips HDCP 2.2? [closed]
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 ...
- 17
0
votes
1
answer
46
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.
...
- 3
0
votes
0
answers
155
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 ...
- 283
0
votes
1
answer
383
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?
- 103
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. ...
- 193
-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'...
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-1
votes
1
answer
569
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 ...
-1
votes
1
answer
196
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 ...
- 49
-2
votes
1
answer
222
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 ...
- 1