How can an image be sharpened or illuminated in one direction or angle?

I have an image that I want to sharpen at a 45 degree angle. can you help me?

Answer 1

[Rahul]

Hi @Hamid Reza Khodadad,

In order to apply directional sharpening to an image at 45 degrees, consider using the following steps:

• A kernel specific for 45 degree filtering can be defined.
• 'imfilter' function can be used to apply the kernel on the image to detect edges along the 45 degree angle.

Here is the example with attached image:

img = imread('rice.png');

% Kernel for 45 degree filtering 
kernel = [ 0  1  2; -1  0  1; -2 -1  0];

directionalSharpenedImg = imfilter(double(img), kernel);

imshow(uint8(img));
title('Original Image');

imshow(uint8(directionalSharpenedImg));
title('Image enhanced at 45 degree angle');

In order to sharpen the image without any direction constraints, 'imsharpen' function can directly be used.

The following MathWorks documentations can be referred to know more:

'imfilter': https://www.mathworks.com/help/images/ref/imfilter.html

'imsharpen': https://www.mathworks.com/help/images/ref/imsharpen.html

Thanks.