hi i have a video and i want to consider the action of sequential frames for special x and all y with that x. this means instead i show xy plane in each frame i want to see yt plane for x=120 in sequential frame in video how can i do this?(if my frame size in 240×320 i want to see yt plane for x=120 means the temporal treatment of x=120 for frames)please help me
MATLAB: Temporal treatment of special row or column of frames in video
image analysisImage Processing Toolbox
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Why not just use rgb2gray() and im2frame():
kraw = rgb2gray(poj_ramka);mov(k)= im2frame(kraw);Try this demo. That is one of the things it does:
% Demo macro to extract frames and get frame means from an avi movie
% and save individual frames to separate image files.
% Also computes the mean gray value of the color channels.
clc; % Clear the command window.
close all; % Close all figures (except those of imtool.)
imtool close all; % Close all imtool figures.
clear; % Erase all existing variables.
workspace; % Make sure the workspace panel is showing.
fontSize = 14;% Change the current folder to the folder of this m-file.
% (The line of code below is from Brett Shoelson of The Mathworks.)
if(~isdeployed) cd(fileparts(which(mfilename)));end% Open the rhino.avi demo movie that ships with MATLAB.
folder = fullfile(matlabroot, '\toolbox\images\imdemos');movieFullFileName = fullfile(folder, 'rhinos.avi');% Check to see that it exists.
if ~exist(movieFullFileName, 'file') strErrorMessage = sprintf('File not found:\n%s\nYou can choose a new one, or cancel', movieFullFileName); response = questdlg(strErrorMessage, 'File not found', 'OK - choose a new movie.', 'Cancel', 'OK - choose a new movie.'); if strcmpi(response, 'OK - choose a new movie.') [baseFileName, folderName, FilterIndex] = uigetfile('*.avi'); if ~isequal(baseFileName, 0) movieFullFileName = fullfile(folderName, baseFileName); else return; end else return; endendtry videoObject = VideoReader(movieFullFileName) % Determine how many frames there are.
numberOfFrames = videoObject.NumberOfFrames; vidHeight = videoObject.Height; vidWidth = videoObject.Width; numberOfFramesWritten = 0; % Prepare a figure to show the images in the upper half of the screen.
figure;% screenSize = get(0, 'ScreenSize');
% Enlarge figure to full screen.
set(gcf, 'units','normalized','outerposition',[0 0 1 1]); % Ask user if they want to write the individual frames out to disk.
promptMessage = sprintf('Do you want to save the individual frames out to individual disk files?'); button = questdlg(promptMessage, 'Save individual frames?', 'Yes', 'No', 'Yes'); if strcmp(button, 'Yes') writeToDisk = true; % Extract out the various parts of the filename.
[folder, baseFileName, extentions] = fileparts(movieFullFileName); % Make up a special new output subfolder for all the separate
% movie frames that we're going to extract and save to disk.
% (Don't worry - windows can handle forward slashes in the folder name.)
folder = pwd; % Make it a subfolder of the folder where this m-file lives.
outputFolder = sprintf('%s/Movie Frames from %s', folder, baseFileName); % Create the folder if it doesn't exist already.
if ~exist(outputFolder, 'dir') mkdir(outputFolder); end else writeToDisk = false; end % Loop through the movie, writing all frames out.
% Each frame will be in a separate file with unique name.
meanGrayLevels = zeros(numberOfFrames, 1); meanRedLevels = zeros(numberOfFrames, 1); meanGreenLevels = zeros(numberOfFrames, 1); meanBlueLevels = zeros(numberOfFrames, 1); for frame = 1 : numberOfFrames % Extract the frame from the movie structure.
thisFrame = read(videoObject, frame); % Display it
hImage = subplot(2, 2, 1); image(thisFrame); caption = sprintf('Frame %4d of %d.', frame, numberOfFrames); title(caption, 'FontSize', fontSize); drawnow; % Force it to refresh the window.
% Write the image array to the output file, if requested.
if writeToDisk % Construct an output image file name.
outputBaseFileName = sprintf('Frame %4.4d.png', frame); outputFullFileName = fullfile(outputFolder, outputBaseFileName); % Stamp the name and frame number onto the image.
% At this point it's just going into the overlay,
% not actually getting written into the pixel values.
text(5, 15, outputBaseFileName, 'FontSize', 20); % Extract the image with the text "burned into" it.
frameWithText = getframe(gca); % frameWithText.cdata is the image with the text
% actually written into the pixel values.
% Write it out to disk.
imwrite(frameWithText.cdata, outputFullFileName, 'png'); end % Calculate the mean gray level.
grayImage = rgb2gray(thisFrame); meanGrayLevels(frame) = mean(grayImage(:)); % Calculate the mean R, G, and B levels.
meanRedLevels(frame) = mean(mean(thisFrame(:, :, 1))); meanGreenLevels(frame) = mean(mean(thisFrame(:, :, 2))); meanBlueLevels(frame) = mean(mean(thisFrame(:, :, 3))); % Plot the mean gray levels.
hPlot = subplot(2, 2, 2); hold off; plot(meanGrayLevels, 'k-', 'LineWidth', 2); hold on; plot(meanRedLevels, 'r-'); plot(meanGreenLevels, 'g-'); plot(meanBlueLevels, 'b-'); grid on; % Put title back because plot() erases the existing title.
title('Mean Gray Levels', 'FontSize', fontSize); if frame == 1 xlabel('Frame Number'); ylabel('Gray Level'); % Get size data later for preallocation if we read
% the movie back in from disk.
[rows columns numberOfColorChannels] = size(thisFrame); end % Update user with the progress. Display in the command window.
if writeToDisk progressIndication = sprintf('Wrote frame %4d of %d.', frame, numberOfFrames); else progressIndication = sprintf('Processed frame %4d of %d.', frame, numberOfFrames); end disp(progressIndication); % Increment frame count (should eventually = numberOfFrames
% unless an error happens).
numberOfFramesWritten = numberOfFramesWritten + 1; % Now let's do the differencing
alpha = 0.5; if frame == 1 Background = thisFrame; else % Change background slightly at each frame
% Background(t+1)=(1-alpha)*I+alpha*Background
Background = (1-alpha)* thisFrame + alpha * Background; end % Display the changing/adapting background.
subplot(2, 2, 3); imshow(Background); title('Adaptive Background', 'FontSize', fontSize); % Calculate a difference between this frame and the background.
differenceImage = thisFrame - uint8(Background); % Threshold with Otsu method.
grayImage = rgb2gray(differenceImage); % Convert to gray level
thresholdLevel = graythresh(grayImage); % Get threshold.
binaryImage = im2bw( grayImage, thresholdLevel); % Do the binarization
% Plot the binary image.
subplot(2, 2, 4); imshow(binaryImage); title('Binarized Difference Image', 'FontSize', fontSize); end % Alert user that we're done.
if writeToDisk finishedMessage = sprintf('Done! It wrote %d frames to folder\n"%s"', numberOfFramesWritten, outputFolder); else finishedMessage = sprintf('Done! It processed %d frames of\n"%s"', numberOfFramesWritten, movieFullFileName); end disp(finishedMessage); % Write to command window.
uiwait(msgbox(finishedMessage)); % Also pop up a message box.
% Exit if they didn't write any individual frames out to disk.
if ~writeToDisk return; end % Ask user if they want to read the individual frames from the disk,
% that they just wrote out, back into a movie and display it.
promptMessage = sprintf('Do you want to recall the individual frames\nback from disk into a movie?\n(This will take several seconds.)'); button = questdlg(promptMessage, 'Recall Movie?', 'Yes', 'No', 'Yes'); if strcmp(button, 'No') return; end % Read the frames back in, and convert them to a movie.
% I don't know of any way to preallocate recalledMovie.
for frame = 1 : numberOfFrames % Construct an output image file name. outputBaseFileName = sprintf('Frame %4.4d.png', frame); outputFullFileName = fullfile(outputFolder, outputBaseFileName); % Read the image in from disk.
thisFrame = imread(outputFullFileName); % Convert the image into a "movie frame" structure.
recalledMovie(frame) = im2frame(thisFrame); end % Get rid of old image and plot.
delete(hImage); delete(hPlot); % Create new axes for our movie.
subPlot(1, 3, 2); axis off; % Turn off axes numbers.
title('Movie recalled from disk', 'FontSize', fontSize); % Play the movie in the axes.
movie(recalledMovie); % Note: if you want to display graphics or text in the overlay
% as the movie plays back then you need to do it like I did at first
% (at the top of this file where you extract and imshow a frame at a time.)
msgbox('Done with this demo!');catch ME % Some error happened if you get here.
stError = lasterror; strErrorMessage = sprintf('Error extracting movie frames from:\n\n%s\n\nError: %s\n\n)', movieFullFileName, stError.message); uiwait(msgbox(strErrorMessage));end
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