45. General measures - color image fidelity assessor - 2011

45. General measures - color image fidelity assessor - 2011...

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Purdue University Page 1 Wencheng Wu (Xerox Corporation) Zygmunt Pizlo (Purdue University) Jan P. Allebach (Purdue University) * Research supported by HP Company while Wencheng Wu was at Purdue
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Purdue University Page 2 Introduction Spatial color descriptor: chromatic difference Structure of Color Image Fidelity Assessor (CIFA) Psychophysical experiment and its results Test examples Conclusion
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Purdue University Page 3 Image fidelity assessment is important in the development of imaging systems and image processing algorithms Create visually lossless reproduction Allocate efforts on most visible area Subjective evaluation is expensive and slow.
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Purdue University Page 4 Simple but not working Root-Mean-Square Error Consider structure of HVS and perceptual process Achromatic: Daly’s VDP, Lubin’s VDM, Taylor’s Achromatic IFA (IFA) Color: Jin’s CVDM (Daly’s VDP + Wandell’s Spatial CIE Lab)
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Purdue University Page 5 Both operate along opponent-color coordinates Both incorporate results from electrophysiological and psychophysical exp. They differ in a similar way as VDP vs. IFA CIFA has closer link between the structure of the model and the psychophysical data used by the model CIFA normalize the chromatic responses This discounts luminance effect in chromatic channels This reduces the dimension of psychometric LUT
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Purdue University Page 6 Color extension of Taylor’s achromatic IFA The model predicts perceived image fidelity
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45. General measures - color image fidelity assessor - 2011...

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