Non-Gradient Based Design Metrics for Underwater Image Enhancement

Non-gradient-based design metrics are objective measures used to evaluate the effectiveness of image enhancement techniques for underwater images. These metrics focus on improving various aspects of enhanced images, such as color correction, contrast enhancement, noise reduction, and overall visual quality. They address the challenges posed by underwater conditions, including color distortion, poor contrast, and noise. Some common non-gradient-based metrics include assessing color constancy and color reproduction accuracy to restore accurate color information. Contrast improvement metrics measure the effectiveness of enhancing object visibility, while noise reduction metrics evaluate the removal of noise artifacts. Visibility enhancement and image clarity metrics focus on improving the overall quality of underwater images. Color correction metrics aim to correct color imbalances, and perceptual metrics assess the perceived image quality. Robustness metrics consider performance under varying underwater conditions, while computational efficiency and energy consumption metrics evaluate algorithm practicality. A combination of these metrics ensures a comprehensive evaluation of underwater image enhancement techniques, essential for various applications, including marine research, underwater exploration, and surveillance.