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Journal of Information Science and Engineering, Vol. 26 No. 2, pp. 713-723 (March 2010)

Calibration-Based Auto White Balance Method for Digital Still Camera*

LI-CHENG CHIU AND CHIOU-SHANN FUH
Department of Computer Science and Information Engineering
National Taiwan University
Taipei, 106 Taiwan

This paper introduces a calibration-based auto white balance method for digital still camera. The main idea is to detect white-points in an image accurately. White-Point Color Temperature Curve (WPCTC) is constructed from sensor calibration and is utilized to estimate white-point locations in a scene. Minimum Color Temperature Distance (MCTD) with a luminance threshold is defined to further locate white-points of an image exactly. Our proposed method is performed in RGB color space so it is suitable for digital still camera pipeline design. In our experiments, our approach is compared with other white balance methods and performs better in color consistency.

Keywords: white balance, white-point, white-point color temperature curve, sensor calibration, minimum color temperature distance

Full Text () Retrieve PDF document (201003_24.pdf)

Received March 3, 2008; revised May 22, 2008; accepted June 5, 2008.
Communicated by Tong-Yee Lee.
* This research was supported in part by Syntek Corporation.