COLOR REPRESENTATION SPACES AT DIFFERENT PHYSIOLOGICAL LEVELS - A COMPARATIVE-ANALYSIS

In this work, we analyse and compare several linear and nonlinear colo ur representation spaces at different physiological levels, show the r elationships between spaces and discuss the mathematical properties th ey should exhibit. At the photoreceptor level, we examine the cone exc itation and the cone contrast spaces. We discuss the second-stage spac es, usually known as ATD-spaces, paying particular attention to Boynto n's space and including a nonlinear space, the opponent modulation spa ce. In addition, we approach third-stage transformations, which might take place at the cortical level. Finally, we analyse a perceptual ATD -type space, discussing how it might be derived as a third-stage trans formation of an LGN-based ATD-space.