Video file of changing solid colors

Question

Olivia Harris 2019-9-10

0
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/479793-video-file-of-changing-solid-colors

回答： Olivia Harris 2019-9-23

Hello. I want to create a video file of a solid screen changing colors. I am trying to change the color of the figure systematically through hexcodes and record this as a single video. This will be used ultimately for spectral reflectance recordings of different hexcodes, so I want a single stimulus video displaying one color at a time and changing color after a few seconds. This is the code I have so far, when d is a column of hexcodes. So far, this seems to be changing the background color of an empty plot and only 'recording' the last image to the .mp4. Any help would be appreciated

HexCodes = VideoWriter('\Users\~\Documents\MATLAB\Hexcode_Colors.mp4','MPEG-4');
open(HexCodes);
fig = gcf; 
set(gca,'visible','off', 'xtick',[])
H = [0 0 0];
fig = figure('Color', H);
hold;
for i = 1:length(d)
    
  d(i,1)  
    
  set(gcf,'color',ans)
  
pause(.05);
f = getframe;
writeVideo(HexCodes,f);
clf
end
close(HexCodes);

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Answer 1

Olivia Harris 2019-9-23

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https://ww2.mathworks.cn/matlabcentral/answers/479793-video-file-of-changing-solid-colors#answer_393140

在 MATLAB Online 中打开

I figured it out!

%so I want to cycle through all RGB values possible. This will take a
%series of for loops, one for each color value. Brightness is still
%unknown. Also need to convert 0-255 to 0-1.
RGBCycler = VideoWriter('\Users\~\Documents\MATLAB\RGB_by15units_5secs_withWhite.mp4','MPEG-4');
RGBCycler.FrameRate = .5;     % Frames per second (speed of video)
open(RGBCycler);
% current figure handle
x = 0
y = 0
z = 0
k = 0
j = 0 
i = 0
h = [0 1 1 0];
l = [0 0 1 1];
patch(h,l,[0 0 0])
set(gca,'visible','off')
tic
for k = 1:17 
   
   z = 0; y = 0 
    
   x = x + 15;
    
    for j = 1:17 
       z = 0;
        
       y = y + 15;
        
        for i = 1:17 
            
            z = z + 15;
            
            col = [ x/255 , y/255, z/255 ]
            
            patch(h,l,col)
          
            
            pause(.5);
            f = getframe;
            writeVideo(RGBCycler,f);
            clf
            
            %To seperate between slight differences in color and reset the spectrometer.
            patch(h,l, [1, 1, 1])
            pause(.5);
            f = getframe;
            writeVideo(RGBCycler,f);
            clf
        end      
    end
end
toc
close(RGBCycler);

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Answer 2

darova 2019-9-11

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链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/479793-video-file-of-changing-solid-colors#answer_391392

在 MATLAB Online 中打开

TRY

HexCodes = VideoWriter('\Users\~\Documents\MATLAB\Hexcode_Colors.mp4','MPEG-4');
HexCodes.FrameRate = 30;        % Frames per second (speed of video)
open(HexCodes);
H = [0 0 0];
fig = figure('Color', H);
set(gca,'visible','off', 'xtick',[])
d = jet(100);                    % create 100 colors of 'jet' colormap
for i = 1:size(d,1)
    set(gcf,'color',d(i,:))
    pause(.1);
    f = getframe;
    writeVideo(HexCodes,f);
clf
end
close(HexCodes);

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Olivia Harris 2019-9-11

Unfortunately that's still only changing the background of the figure, and the recording is just the blank white figure. Also it's important that I can control the list of colors given.

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