How can I change small amounts of zeros in to ones in binary code?

The code below makes a signal with peaks binary. Due to some disturbances in the setup, some peaks have within the peak zero values. How can I change the zeros in to ones if the amount of consecutive zeros<20? Or how can I disregard peaks (turn them into zeros) which are to close to eachother.((steps between peaks)<20)

nrows = 65000; ncols=146;

G = results(nrows,ncols);

    for c = 1:ncols
        for r=1:nrows

        if results(r,c) <= 4.657
            G(r,c) = 1;

        else
            G(r,c) = 0;
        end
        end
    end

Answer 1

[Image Analyst]

Do you have the Image Processing Toolbox? If you do it's pretty simple. Just ask regionprops() for the 'Area' to get the lengths of the stretches of zeros, and 'PixelIdxList' to get their indexes. Then set those indexes of stretched less than 20 in length to 1.

I can give you code if you give me some code that creates some demo data.

[julia]

G = [ones(1,20) zeros(1,5) ones(1,25) zeros(1,50) ones(1,15) zeros(1,8); ones(1,20) zeros(1,25) ones(1,15) zeros(1,10) ones(1,45) zeros(1,8)]' That would help a lot

[Image Analyst]

I'm heading out for a few hours. In the meantime, see my Image Segmentation Tutorial. It will show you how to do it. http://www.mathworks.com/matlabcentral/fileexchange/25157-image-segmentation-tutorial---blobsdemo--

In brief, something like this (untested).

binarySignal = G == 0;  % list of all elements that have value 0.
labeledSignal = bwlabel(binarySignal);
measurements = regionprops(labeledSignal, 'Area', 'PixelIdxList');
allAreas = [measurements.Area];
indexesOfSmallAreas = allAreas < 20; % Blob numbers, not indexes of G.
for k = 1 : length(indexesOfSmallAreas);
  index = indexesOfSmallAreas(k);
  theseElements = measurements(index).PixelIdxList;
  % Set elements in the original G signal to 1.
  G(theseElements) = 1; % Or whatever value you want them to be.
end

[julia]

Thanks a lot. It works now only for the first too small area but I think, I can work out the rest.