Remove brighter regions in an image on frequency domain

1. How do you enhance the quality of images in frequency domain?
2. How image can be smooth using frequency domain filters?
3. What is filtering in frequency domain?
4. What is image enhancement in frequency domain?

How do you enhance the quality of images in frequency domain?

High-Pass Filtering (Sharpening) Image Enhancement

A high-pass filter is used to sharpen an image and is another common form of frequency-domain image enhancement. This method focuses on the finer details in the image and does the exact opposite of a low-pass filter.

How image can be smooth using frequency domain filters?

Frequency Domain Filters are used for smoothing and sharpening of image by removal of high or low frequency components. Sometimes it is possible of removal of very high and very low frequency. Frequency domain filters are different from spatial domain filters as it basically focuses on the frequency of the images.

What is filtering in frequency domain?

Filtering in the frequency domain consists of modifying the Fourier transform of an image and then computing the inverse transform to obtain the processed result. A high-pass filter (which attenuates low frequencies) enhances sharp detail, but cause a reduction in contrast in the image.

What is image enhancement in frequency domain?

Image enhancement in the frequency domain is straightforward. We simply compute the Fourier transform of the image to be enhanced, multiply the result by a filter (rather than convolve in the spatial domain), and take the inverse transform to produce the enhanced image.