52. spatiochromatic_models with SSIM - 2011

52. spatiochromatic_models with SSIM - 2011 - CIC-19,...

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Unformatted text preview: CIC-19, 4BO!+PTF-!$" , 8 November 2011 Spatiochromatic Vision Models for Imaging with Applications to the Development of Image Rendering Algorithms and Assessment of Image Quality Jan P. Allebach School of Electrical and Computer Engineering Purdue University West Lafayette, Indiana allebach@purdue.edu CIC-19, 4BO!+PTF-!$" , 8 November 2011 CIC-19, 4BO!+PTF-!$" , 8 November 2011 2/120 What is a model? Model is not a complete description of the phenomenon being modeled. It should capture only what is important to the application at hand, and nothing more. Its structure must be responsive to resource constraints. From dictionary.com: A schematic description of a system, theory, or phenomenon that accounts for its known or inferred properties and may be used for further study of its characteristics. CIC-19, 4BO!+PTF-!$" , 8 November 2011 3/120 Visual system components Retina Optic Nerve Visual Cortex Saccadic Motion Viewing Conditions and Surround Adaptation Stimulus Response Primary Secondary CIC-19, 4BO!+PTF-!$" , 8 November 2011 4/120 Why do we need spatiochromatic models? Imaging systems succeed by providing a facsimile of the real world A few primaries instead of an exact spectral match Spatially discretized and amplitude quantized representation of images that are continuous in both space and amplitude These methods only succeed only because of the limitations of the human visual system (HVS) To design lowest cost systems that achieve the desired objective, it is necessary to take into account the human visual system in the design and evaluation CIC-19, 4BO!+PTF-!$" , 8 November 2011 5/120 Modeling context Modeling process is very dependent on the intended application - Motivation for developing the models in the first place - Governs choice of features to be captured and computational structure of the model - Provides the final test of the success of the model Tight interplay between models for imaging system components and the human visual system Model usage may be either embedded or external CIC-19, 4BO!+PTF-!$" , 8 November 2011 6/120 Pedagogical approach Spatiochromatic modeling, in principle, builds on all of the following areas: - Color science - Imaging science - Psychophysics - Image systems engineering As stated in course description, we assume only a rudimentary knowledge of these subjects Start from basic principles, but move quickly to more advanced level Focus on what is needed to follow the modeling discussion See references at end CIC-19, 4BO!+PTF-!$" , 8 November 2011 7/120 Synopsis of tutorial General framework for spatiochromatic models for the HVS Introduction to digital halftoning Application of spatiochromatic models to design of color halftones Overview of use of HVS models in image quality assessment Color Image Fidelity Assessor CIC-19, 4BO!+PTF-!$" , 8 November 2011 8/120 For further information There is an extensive list of references at the end of...
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This note was uploaded on 02/19/2012 for the course ECE 638 taught by Professor Staff during the Fall '08 term at Purdue University-West Lafayette.

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52. spatiochromatic_models with SSIM - 2011 - CIC-19,...

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