MUMBAI, India, May 1 -- Intellectual Property India has published a patent application (202641050087 A) filed by Srinivasa Ramanujan Institute Of Technology; Mr. M. Rami Reddy; C. Susmitha; B. Sreedhar; and K. Siva Sai, Ananthapuramu, Andhra Pradesh, on April 20, for 'restoring underwater image quality through variational enhancement frameworks.'

Inventor(s) include Srinivasa Ramanujan Institute Technology; Mr. M. Rami Reddy; C. Susmitha; B. Sreedhar; and K. Siva Sai.

The application for the patent was published on May 1, under issue no. 18/2026.

According to the abstract released by the Intellectual Property India: "The primary aim of this invention is to develop an advanced underwater image enhancement and restoration system that significantly improves the visual quality of submerged imagery affected by absorption, scattering, and non-uniform illumination. Underwater images often suffer from color imbalance, low contrast, and loss of detail due to wavelength-dependent light attenuation. This invention introduces a hybrid framework combining Bidimensional Empirical Mode Decomposition (BEMD) and a variational restoration model to recover true color, visibility, and texture information. The process begins with background light estimation using Laplacian of Gaussian (LoG) region- based analysis to correct illumination distortions. It then computes and refines wavelength-aware transmission maps to mitigate haze effects across red, green, and blue channels. A variational optimization framework reconstructs scene radiance by minimizing noise and color distortion through Alternating Direction Method of Multipliers (ADMM). Subsequently, BEMD decomposition enhances mid-frequency features, and adaptive unsharp masking sharpens edges using Otsu's thresholding. The system yields color-balanced, high-clarity underwater images with superior Peak Signal-to-Noise Ratio (PSNR) and reduced artifacts compared to conventional methods. This invention finds applications in marine exploration, underwater navigation, environmental monitoring, and oceanographic research, enabling high-quality visual analysis under challenging aquatic conditions."

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