Dark image using imshow
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Hello,
I'm having a problem with imshow. I'm going point per point through my data and want to plot the corresponding video while I do this.
The file works when there is no video in it. And in another file I was able to plot the whole data with the video playing.
BUT: now when I use "animatedline" with "addpoints" the video is black. The video is black and becomes lighter sometimes, but you can't see anything.I have added a screenshot of the figure while its going through the data in the attachment.
UPDATE: when i remove all the animatedlines and addpoints the video plays correctly
Here is my code
%code
daqrate = 40;
VID = VideoReader('Zwemvideo1.mp4','Tag','My reader object');
writerObj = VideoWriter('output_video','MPEG-4');
writerObj.FrameRate = 40;
fps=30;%VID.FrameRate;
totalframes=VID.NumberOfFrames;
rate=daqrate/fps;
frameA=read(VID,1);
x=[329 752];
y=[50 411];%56
ratio =(y(2)-y(1))/(x(2)-x(1));
acc_y = resample(acc_y,3,4);
acc_z = resample(acc_z,3,4);
gyr_y = resample(gyr_y,3,4);
gyr_x = resample(gyr_x,3,4);
figure
subplot(5,1,1)
xlabel('samples')
ylabel('gyr_x filtered')
title('Turn detection')
h = animatedline;
axis([0 length(gyr_x) -230 330])
x = linspace(0,length(gyr_x),length(gyr_x));
subplot(5,1,2)
xlabel('samples')
ylabel('acc_z filtered')
title('Stroke detection')
g = animatedline;
axis([0 length(acc_z) -1 1.5])
y = linspace(0,length(acc_z),length(acc_z));
subplot(5,1,3)
xlabel('samples')
ylabel('gyr_y filtered')
title('Stroke detection')
f = animatedline;
axis([0 length(gyr_y) -100 140])
z = linspace(0,length(gyr_y),length(gyr_y));
subplot(5,1,4)
xlabel('samples')
ylabel('acc_y filtered')
title('Stroke detection')
e = animatedline;
axis([0 length(acc_y) -2 2])
w = linspace(0,length(acc_y),length(acc_y));
for i = 1: length(gyr_x)
%video
drawnow
subplot(5,1,5)
frame= read(VID,1+i-1);
imshow(frame(y(1):y(2),x(1):x(2),:),[]);
%rest
gyr_x_memory= gyr_x(1:i);
gyr_x_lowpass = [gyr_x_lowpass lowpass_filter(32,gyr_x_memory,gyr_x_lowpass)];%32
%gyr_x_lowpass=abs(gyr_x_lowpass);
gyr_y_memory= gyr_y(1:i);
gyr_y_lowpass = [gyr_y_lowpass lowpass_filter(20,gyr_y_memory,gyr_y_lowpass)];
%gyr_y_lowpass=abs(gyr_y_lowpass);
acc_z_memory= acc_z(1:i);
acc_z_lowpass = [acc_z_lowpass lowpass_filter(20,acc_z_memory,acc_z_lowpass)];
%acc_z_lowpass=abs(acc_z_lowpass);
acc_y_memory= acc_y(1:i);
acc_y_lowpass = [acc_y_lowpass lowpass_filter(64,acc_y_memory,acc_y_lowpass)];%20->30 meer gesmooth
addpoints(h,x(i),gyr_x_lowpass(i));
drawnow limitrate
addpoints(g,y(i),acc_z_lowpass(i));
drawnow limitrate
addpoints(f,z(i),gyr_y_lowpass(i));
drawnow limitrate
addpoints(e,w(i),acc_y_lowpass(i));
drawnow limitrate
end
0 件のコメント
回答 (1 件)
Image Analyst
2016 年 4 月 16 日
Your "frame" appears to be 3D. Using [] in imshow() doesn't work for RGB images. So you're going to have to figure out why your "frame" values are not integers in the range 0 - 255.
16 件のコメント
Image Analyst
2016 年 4 月 17 日
Are the addpoints supposed to go to other axes, or onto the image axes?
If onto the image axes, then perhaps use hold on.
If onto one of the top 4 axes, then use subplot() to switch the current axes back to the one it's supposed to plot into.
参考
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