Colorless image processing technique combining chromaticity transfer and image feature extraction in visual graphic design

This study presents a verifiable framework for high-fidelity colorless image processing by integrating depth-guided chrominance transfer with multi-level feature extraction. To address critical limitations of traditional methods-color inconsistency, edge bleeding, and insufficient feature matching accuracy-we establish a dual-channel processing pipeline for RGB-D images. This study presents a high-fidelity colorless image processing framework through depth-guided chrominance transfer and multi-level feature extraction. The method introduces three key innovations: a weighted non-local Laplacian algorithm for cross-modal consistency, a multi-level feature hierarchy bridging pixel statistics to semantic understanding, and a brightness-guided edge preservation mechanism. Rigorous testing on benchmark datasets (Middlebury Stereo, MIT-Adobe FiveK, BSDS500, Flickr Million) under standardized preprocessing confirms its efficacy. The algorithm reduces color reconstruction error to 0.020 ± 0.003-a 60% improvement over the Welsh method-with a Turbo-pixel 800 edge fitting accuracy of 0.93 and over-segmentation of only 8%. The three-level feature system boosts matching recall to 91.4%±2.1% from 62.3%, while cutting semantic alignment error from 12.4 to 3.1 ± 0.7 pixels. On MIT-Adobe FiveK, it achieves a PSNR of 38.5 ± 0.4 dB, SSIM of 0.942 ± 0.008, and 9.4 FPS, outperforming diffusion-based colorization by 3.7 dB PSNR with 37% faster speed. All results are statistically significant (p < 0.05) and fully reproducible. This work provides a transparent, efficient, and robust solution for visual graphic design, establishing a new benchmark for colorless image processing.