I want to perform blob detection for a satellite imagery

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sandhya chezhian 2014-2-27

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回答： Vignesh 2014-4-14

please help me with the code.im using Matlab 7.10.0 (R2010a)

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sandhya chezhian 2014-3-29

can u pls help me with the code vignesh???

Vignesh 2014-3-29

编辑：Vignesh 2014-4-4

Hope this could be useful for your blob detection sandhya chezhian

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Vignesh 2014-3-29

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在 MATLAB Online 中打开

Detects blobs in an image. * ------>

 inputs:  
 ------->
 im_in - the input image
 threshold - only accept maxima above a threshold (0-1.0)
 t - the linear range for sampling exp(t), eg. t=1.0:.1:3
 padding - an array for padding the image, eg. [pad_x pad_y]
 outputs:  
 -------->
 blobs - an array of blobs (x, r, radius)

function blobs = detect_blobs(im_in, threshold, t, padding)

    Set default values
    if (nargin() < 4)
        padding = [10 10];
    end
    if (nargin() < 3)
        t = 1.0:0.1:3.0;
    end
    if (nargin() < 2)
        threshold = 0.35;
    end
    % Convert input to double
    im_in = double(im_in)./255.0;
    % Padd the image with whitespace
    pad_x = 10;
    pad_y = 10;
    im_in = pad_image(im_in, padding(1), padding(2), 1.0);
    [rows cols] = size(im_in);
    % Create a log sampling scale space
    et = exp(t);
    % Create our scale space
    all_ims = create_scale_space(im_in, et);
    blobs = {};
    % Now find centers of blobs
    for i=1:length(et)
        for j=1:rows
            for k=1:cols
                if ((is_maximum(all_ims, i, j, k)) && (all_ims(i,j,k) >= threshold))
                    blobs{end+1} = [j-padding(1) k-padding(2) et(i) all_ims(i,j,k)];
                end
            end
        end
    end

end

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Vignesh 2014-4-14

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Hope u got ur req output... to improve ur accuracy use image segmentation by mathematical morphology procedure too..wat is ur purpose of blob detection in satellite image..??