Color Tracking with Webcam, how do I speed it up??

This is my code:

clear all

vid=videoinput('winvideo',1);

set(vid,'ReturnedColorSpace','RGB');

for x = 1:10

    img = getsnapshot(vid);
    R = img(:,:,1);
    G = img(:,:,2);
    B = img(:,:,3);
    a = find(R>90 & R<157 & G>0 & G<100 & B>0 & B<81);
    BW=zeros(480,640);
    BW(a)=1;
    imshow(BW)

end

[Walter Roberson]

Please do not use "matlab" as a Tag. http://www.mathworks.co.uk/matlabcentral/answers/43073-a-guide-to-tags

Answer 1

[Walter Roberson]

Change your two lines

    BW=zeros(480,640);
    BW(a)=1;

to

    BW = double(a);

This would produce exactly the same matrix as you are now producing.

You might possibly get slightly better graphics performance with uint8 instead of double, but you'd want to time carefully to be sure. For that,

BW = uint8(255) .* uint8(a);

or maybe

BW = uint8( 255 .* a );

or perhaps even

T = uint8([0 255]);
BW = T(1 + a);