The resolution achieved by human vision should not be uniform, considering the non-even distribution of cone cells on the retina. However, details of resolution distribution remain unknown: it remains unclear what kind of images are formed on the virtual screen in the brain. This study should indicate the minimum image set necessary for non-degraded image recognition. Subjective tests are carried out in order to confirm human sensitivity to degraded images with decreased chroma values in the circumferential area. The subjects are asked to choose the degree of image degradation from among five levels. Another experiment is carried out to clarify the resolution distribution in human vision: eye mark tracks are recorded in the task of searching for a target pattern from among a pattern array projected on a screen. A resolution distribution is obtained from these eye marks. The distributions of resolution and the sensitivity to chroma level are shown to well match the distribution of cone cells on the retina. The actual image in the brain can be estimated from these distributions.
Hideaki Takamiya, Makoto Omodani, Yasusuke Takahashi, "Estimation of Actual Image in a Brain Using Measured Results of Distributions of the Color Sensitivity and the Resolution in the Human Vision" in Proc. IS&T Int'l Conf. on Digital Printing Technologies (NIP18), 2002, pp 823 - 826, https://doi.org/10.2352/ISSN.2169-4451.2002.18.1.art00101_2