Near-Monochromatic Illumination and Crosstalk Correction for Color Imaging

Continuous‑spectrum illumination induces severe channel crosstalk and resolution degradation in color imaging systems. To address this issue, this paper introduces near‑monochromatic LED illumination matched to the lens design wavelength and proposes a linear crosstalk correction method based on CCD grayscale superposition. Experiments under ISO 12233 evaluation reveal that mixed‑color LED illumination only enhances the blue channel, while separate monochromatic illumination and image synthesis effectively eliminate crosstalk and boost overall resolution. The proposed linear method calibrates crosstalk coefficients via a standard reference area to correct single‑shot mixed‑color images, bringing R/B channels close to pure monochromatic performance, with minor over‑sharpening in the green channel. This approach provides a feasible linear correction solution to suppress crosstalk and improve resolution for single‑shot industrial color imaging with near‑monochromatic LED illumination.