How do I remove grid lines from a JPEG image using Image Processing Toolbox 6.2 (R2008b)?

I have a grayscale JPEG image that is largely dark and contains thin gray grid lines. I would like to replace the pixels forming the grid with pixels that fit in with the rest of the image.

Answer 1

[MathWorks Support Team]

The following example code demonstrates one way to remove thin grid lines from an image using erosion and dilation and compares the original image with the processed image.

close all; clear all; clc;

% Create image with light gray grid lines

I = imread('snowflakes.png');

I(:,[100,200,300]) = uint8(200);

I([50,100],:) = uint8(200);

subplot(2,1,1);

imshow(I);

title('Original image');

% Morphologically open image

se = strel('square',2);

I2 = imopen(I,se);

subplot(2,1,2);

imshow(I2);

title('Morphologically opened image');