Kitirochna RATTANAKASAMSUK^* and Hiroyuki SHINODA

Human Vision Laboratory, Graduate School of Science and Engineering, Ritsumeikan University, Kusatsu, Shiga 525-8577, Japan

(Received November 24, 2006; Accepted March 26, 2007)

In the previous work we investigated the influence of depth separation on exclusion of the local effect from the assessment of the recognized illuminant. Under whitish illumination, only a portion of the local effect was excluded, while this study, we extended the range of illumination from whitish to chromatic illuminant. We evaluated how the depth separation influences the amount of local effect under the chromatic illumination. Subjects did perceptual achromatic setting under various combinations of local surround and illumination conditions. We found that under chromatic illumination, depth separation is more effective to exclude the local effect even though the local effect was smaller than under whitish chromatic illumination.

Key words: recognition of the illumination, local effect, chromatic induction, depth separation, achromatic loci

^*E-mail address: kitirochna@gmail.com