Image Butterworth Notch Filter

The Image Butterworth Notch Filter is a widely used filtering technique that effectively eliminates specific frequency interferences in digital images. By applying this filter, engineers can perform advanced image processing to enhance image quality and clarity. The design principle is based on Butterworth filter characteristics, which utilize specified cutoff frequencies to remove noise and interference patterns from images. Implementation typically involves creating a frequency domain mask with circular symmetric notch regions, where the filter response follows Butterworth's smooth roll-off characteristics around the rejection frequencies. This approach effectively suppresses unwanted frequency components while preserving important image details, resulting in clearer images with richer texture information. The filter finds extensive applications in image processing fields, particularly in removing periodic noise, moiré patterns, and other frequency-specific artifacts, thereby facilitating better analysis and interpretation of image content.