A novel color filter array with 75% transparent elements

Gang Luo

doi:10.1117/12.702950

20 February 2007 A novel color filter array with 75% transparent elements

Gang Luo

Proceedings Volume 6502, Digital Photography III; 65020T (2007) https://doi.org/10.1117/12.702950
Event: Electronic Imaging 2007, 2007, San Jose, CA, United States

Abstract

Conventional RGB color filter array (CFA) in single-chip color cameras greatly reduce light intensity, and therefore limits the ISO speed of cameras. A novel CFA and an algorithm of forming color images are proposed. 75% of the CFA are transparent elements, and the remaining 25% are repeated color filter blocks. A compact arrangement of color filter elements in each block helps to reduce color artifacts. Such an arrangement features a higher sampling rate of luminance and a lower sampling rate of chrominance. Black-and-white images (BI) with high resolution can be acquired from the transparent elements, and color images (CI) with low resolution from the color filter blocks. To generate output color images (OI), the CI in RGB format is transformed into CIE Lab space, and the luminance components are replaced with the high-resolution BI. Based on a principle compatible to JPEG format, the visual quality of OI is satisfactory. Simulation was conducted using raw images acquired with a Canon 20D camera. Results show the potential of the CFA in making digital cameras with high ISO speed. Applications can be security day/night cameras and cell phone cameras that are able to capture images with low noise under dim light levels.

Citation Download Citation

Gang Luo "A novel color filter array with 75% transparent elements", Proc. SPIE 6502, Digital Photography III, 65020T (20 February 2007); https://doi.org/10.1117/12.702950

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available