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

Question

Hamid Reza Khodadad 2020-6-16

回答： Rahul 2024-12-3，8:04

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

Answer 1

Rahul 2024-12-3，8:04

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:

Thanks.