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23 February 2005 Color processing in camera phones: How good does it need to be?
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Proceedings Volume 5678, Digital Photography; (2005)
Event: Electronic Imaging 2005, 2005, San Jose, California, United States
As the fastest-growing consumer electronics device in history, the camera phone has evolved from a toy into a real camera that competes with the compact digital camera in image quality. Due to severe constraints in cost and size, one key question that remains unanswered for camera phones is: how good does the image quality need to be so that resource can be allocated most efficiently. In this paper, we have tried to find the color processing tolerance through a study of 24 digital cameras from six manufacturers under five different light sources. We measured both the inter-brand (across manufacturers) and intra-brand (within manufacturers) mean and standard deviation for white balance and color reproduction. The white balance results showed that most cameras didn’t follow the complete white balance model. The difference between the captured white patch and the display white point increased when the correlated color temperature (CCT) of the illuminant was further away from 6500K. The standard deviation of the red/green and blue/green ratios for the white patch also increased when the illuminant was further away from 6500K. The color reproduction results revealed a similar trend for the inter-brand and intra-brand chromatic difference of the color patches. The average inter-brand chromatic difference increased from 3.87 ΔE units for the Δ65 light (6500K) to 10.13 ΔE units for the Horizon light (2300K).
© (2005) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Feng Xiao, Xuemei Zhang, and Boyd Fowler "Color processing in camera phones: How good does it need to be?", Proc. SPIE 5678, Digital Photography, (23 February 2005);

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