Color calibration of a CMOS digital camera for mobile imaging

Henrik Eliasson

doi:10.1117/12.838747

18 January 2010 Color calibration of a CMOS digital camera for mobile imaging

Henrik Eliasson

Proceedings Volume 7537, Digital Photography VI; 753709 (2010) https://doi.org/10.1117/12.838747
Event: IS&T/SPIE Electronic Imaging, 2010, San Jose, California, United States

Abstract

As white balance algorithms employed in mobile phone cameras become increasingly sophisticated by using, e.g., elaborate white-point estimation methods, a proper color calibration is necessary. Without such a calibration, the estimation of the light source for a given situation may go wrong, giving rise to large color errors. At the same time, the demands for efficiency in the production environment require the calibration to be as simple as possible. Thus it is important to find the correct balance between image quality and production efficiency requirements. The purpose of this work is to investigate camera color variations using a simple model where the sensor and IR filter are specified in detail. As input to the model, spectral data of the 24-color Macbeth Colorchecker was used. This data was combined with the spectral irradiance of mainly three different light sources: CIE A, D65 and F11. The sensor variations were determined from a very large population from which 6 corner samples were picked out for further analysis. Furthermore, a set of 100 IR filters were picked out and measured. The resulting images generated by the model were then analyzed in the CIELAB space and color errors were calculated using the ΔE94 metric. The results of the analysis show that the maximum deviations from the typical values are small enough to suggest that a white balance calibration is sufficient. Furthermore, it is also demonstrated that the color temperature dependence is small enough to justify the use of only one light source in a production environment.

Citation Download Citation

Henrik Eliasson "Color calibration of a CMOS digital camera for mobile imaging", Proc. SPIE 7537, Digital Photography VI, 753709 (18 January 2010); https://doi.org/10.1117/12.838747

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