Enhancement of Digital Images Using Discrete Cosine Transform (DCT): Quality Analysis Based on PSNR and SSIM Metrics

Abstract

The field of image processing has witnessed significant growth, largely due to the widespread application of digital image processing techniques across various domains. These applications often share a common requirement: the need for methods that enhance pictorial information to facilitate human interpretation and analysis. This study aims to apply a frequency-based enhancement technique to improve distorted digital photographs. One such technique is the Discrete Cosine Transform (DCT), which has demonstrated promising results. The application of this method to grayscale images affected by distortions led to noticeable improvements in overall image quality.