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Color constancy is the perceived stability of the color of objects despite changes in the light illuminating them. An object's color is considered constant if the current perceived color is judged to be in accord with the remembered one. Thus the accuracy and precision of color memory are fundamental to understanding this classic problem. Two hypotheses of(More)
formats was measured, ranging from 3 to 10 mega-pixels; the effects of handshake motion blur are also analyzed via the dead leaves target. Abstract: Conventional point spread function (PSF) measurement methods often use parametric models for the estimation of the PSF. This limits the shape of the PSF to a specific form provided by the model. However, there(More)
A softcopy quality ruler method was implemented for the International Imaging Industry Association (I3A) Camera Phone Image Quality (CPIQ) Initiative. This work extends ISO 20462 Part 3 by virtue of creating reference digital images of known subjective image quality, complimenting the hardcopy Standard Reference Stimuli (SRS). The softcopy ruler method was(More)
  • Elaine W. Jin
  • 2008
The International Imaging Industry Association (I3A) launched the Camera Phone Image Quality (CPIQ) Initiative in June 2006. The goal of this initiative was to develop an image quality testing and performance rating system that could enable manufacturers and carriers to make comparisons between capture devices, and to communicate a substantiated product(More)
The dead leaves model was recently introduced as a method for measuring the spatial frequency response (SFR) of camera systems. The target consists of a series of overlapping opaque circles with a uniform gray level distribution and radii distributed as r-3. Unlike the traditional knife-edge target, the SFR derived from the dead leaves target will be(More)
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