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Remove noise in video

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Jogger on 25 Feb 2020
Edited: Jogger on 15 Mar 2020
I am playing a video file. In the video there are lot's flicker. In first step, I would like to make a detection for flicker frame and later on I would like to remove them as well.
Below is my code snippet. I need a algo for frame with noise detection.
%% Record video - VideoPlayer
close all
filename = 'Trim.mp4'; % video to load
wb = waitbar(0,'Loading the file...'); % show progress bar
v = VideoReader(filename); % create VideoReader object
w = v.Width; % get width
h = v.Height; % get height
d = v.Duration; % get duration
s = struct('cdata',zeros(h,w,3,'uint8'),'colormap',[]); % struct to hold frames
k = 1; % initialize counter
NFrames = v.FrameRate*v.Duration % Number of frames
while hasFrame(v) % while object has frame
f = readFrame(v); % read the frame
s(k).cdata = f; % = imrotate(f,90); % rotate frame as needed
k = k + 1; % increment counter
waitbar(v.CurrentTime/d) % update progress bar
v.CurrentTime = 13; % set current time
f = readFrame(v); % get the frame
close(wb) % close progress bar
axes % create axes
imshow(f) % show the frame
title('Trim.mp4') % add title
I want to understand the under which condition reported frames and frame rate are different.
How to get the histogram for good vs bad frames.
Any help here ?
Thank you!


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Accepted Answer

Image Analyst
Image Analyst on 11 Mar 2020
In the loop, I'd get the mean into an array. Then I'd use some kind of outlier detection code to find peaks in the mean signal. Not step changes which indicate scene changes, but sharp peaks or valleys.


Show 4 older comments
Jogger on 13 Mar 2020
It was just an example
Requirement : Analyze an online video . Identify the flicker frames and do a post processing to remove the flicker and construct smooth video.
suggest you download the video separately somehow to a file, then use the filename on your own computer
Downloading the video separately as a file and playing is NOT an option. The idea is to analyze online/live video for flicker frames.
Thank you!
Image Analyst
Image Analyst on 13 Mar 2020
Sorry, I don't know how to get access to the actual video format file inside YouTube's database. Maybe you'll have to play it first and then look in the temporary internet files folder for the most recent video file and then use that.
Jogger on 14 Mar 2020
Thanks for the help. I'll try it out

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