image quality assessment

Image quality assessment (IQA) is the process of evaluating how good or close a digital image is to the original or ideal image. It involves measuring factors like sharpness, color accuracy, noise, and distortions to determine how visually appealing or accurate an image appears. IQA can be performed either by comparing it to a high-quality reference image (full-reference) or by analyzing the image alone (no-reference). This helps in improving camera technology, compression methods, and online viewing experiences by ensuring images remain clear, natural, and visually pleasing.