MATLAB: Hi, i have pk=1×6 cell,each cell contains 192×192 data, i need to divide each 192×192 data into 3×3,then perfrom “AND”,i.e result=64x64x6

digital image processing

plz check whether my code is correct

fun=@(block_struct) sum(block_struct.data);
for ol=1:length(pk)
result(:,:,ol)=blockproc(pk{ol},[3 3],fun)
end

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fun=@(block_struct) sum(block_struct.data(:));

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MATLAB: I need some help,(i.e) the image is 192×192, i need to divide it into 3×3,and from each 3×3 block,by taking center pixel value as threshold, i need to compare with other neighbouring 8 pixel values, if that value is less than threshld, put 0, else

No need to mess with the complication of cell arrays, simply index to subsample, resize, and then use "<" (less than operator).

data = randi(99, 192,192); % Sample data
[rows, columns] = size(data);
thresholds = data(2:3:end, 2:3:end); % Get centers of 3x3
% Make same size as data
thresholds = imresize(thresholds, [rows, columns], 'nearest');
% Apply threshold.
out = data > thresholds;

MATLAB: Storing image information in a 2-d array

Hello,

That's true. You can use blockproc from Matlab.

It's simple to use.

B = blockproc(A,[M N],fun)

A is input image, [M N] is size of block, and fun is function handle

If you want to divide image into 100 equal block, then

you can divide image width and height by 10. This is for size of the block.

Here my sample code :

I = imread('peppers.png');
I = I(1:300,1:500,:);
[m n o] = size(I);
r = m/10;
c = n/10;
fun = @(block_struct) max(block_struct.data(:));
J = blockproc(I,[r c],fun)

J will returns 10x10 array that represent maximum value of each corresponding block.

J =
     75   78   77   84   84   82   80   87   82   73
     77   83   79   82   83   83   84  135   81   75
     77   83   84   90  254  174  157  250  119   74
     82  150  215  207  255  255  212  249  194  165
     77  136  247  191  225  239  170  255  255  255
     76  169  190  255  255  255  255  255  255  251
    255  255  245  255  255  255  255  255  250  233
    255  255  255  255  255  255  255  216  255  255
    255  255  255  255  255  255  255  255  255  255
    255  255  255  254  202  197  173  177  255  255

I hope this will helps you.

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Related Solutions

MATLAB: I need some help,(i.e) the image is 192×192, i need to divide it into 3×3,and from each 3×3 block,by taking center pixel value as threshold, i need to compare with other neighbouring 8 pixel values, if that value is less than threshld, put 0, else

MATLAB: Storing image information in a 2-d array

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