Medical grade color filter

By introducing a novel design of red, orange, green, and blue filters into a CMOS image sensor, the absorption edge is adjusted to improve spectral capture within the blood absorption band. This solves the problem of insufficient color accuracy in biological tissue image capture by existing CMOS image sensors, achieving higher color reproduction and image clarity.

CN122194364APending Publication Date: 2026-06-12OMNIVISION TECHNOLOGIES INC
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
OMNIVISION TECHNOLOGIES INC
Filing Date
2025-09-26
Publication Date
2026-06-12

AI Technical Summary

Technical Problem

Existing CMOS image sensors struggle to achieve high color accuracy when capturing images of biological tissues, especially human tissues. In particular, colors outside the sRGB color space cannot be fully captured and reproduced, resulting in reduced image color accuracy.

Method used

A novel color filter design is employed, comprising red, orange, green, and blue high-pass, with its absorption edges adjusted to improve spectral capture within the blood absorption band, increasing transmittance. A Bayer filter pattern is used, and an equal number of orange filters are incorporated.

Benefits of technology

It improves color accuracy within the blood absorption zone, enhances image clarity and color reproduction, and significantly improves image capture of human tissues, especially in medical imaging applications.

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Abstract

The present disclosure relates to medical grade color filters. Disclosed herein is a system for producing a color accurate image of biological tissue, including an image sensor configured to capture and transmit an image of biological tissue and a processor configured to receive and display the image of biological tissue. The image sensor can include a pixel array, a light source, and a control unit. The pixel array can include a plurality of sub-pixels and a plurality of color filters. Each sub-pixel can include at least one photodiode. The plurality of color filters can include a red wavelength high-pass color filter, an orange wavelength high-pass color filter, a green wavelength band-pass color filter, and a blue wavelength band-pass color filter. The control unit can be electrically coupled to the pixel array and the light source.
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