CODEWITHSUNDEEP
matlabimage-processingmatlab-figure
Sevian
Sevian

Reputation: 57

Make strip of nan in a matrice matlab

I have an image size (m x n x 4) I want to make strip of 0 or NaNon it. I want the strips to be 4 pixels wide and having a space of about 30 pixels between them. That is when I display the image in RGB I have strips of NaN. Can somebody help me out with this, please?

Upvotes: 1

Views: 71

Answers (1)

m.s.
m.s.

Reputation: 16354

I interpreted you question as "how can I repeatedly draw black lines with a given width and a specified offset over an image". 

img = imread('peppers.png');
height = size(img,1);
strip_width = 4;
strip_offset = 30;

line_start_idx = 0:(strip_width+strip_offset):height;
line_idx = ndgrid(line_start_idx,1:strip_width)';
line_idx = line_idx(:);
line_add = repmat(1:strip_width,1,length(line_start_idx))';
line_idx = line_idx + line_add;

img(line_idx,:,:) = 0;
imshow(img)

image with black lines drawn repeatedly

Upvotes: 1

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