Vision and Color Theory
Twenty four centuries ago, Plato presented in the history of the prisoners in the cave an analogy to human perception. The outline of his theory is that our perception of the world around us consists merely of reflections of the world within us, as captur
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Vision and Color Theory
—I was born before the Age of the ages, in a Place without place, in a Time without time. In a strange way, however, I feel that I existed prior to my birth...My presence counts the eternal. Light
1.1 Introduction Twenty four centuries ago, Plato presented in the history of the prisoners in the cave an analogy to human perception. The outline of his theory is that our perception of the world around us consists merely of reflections of the world within us, as captured by our senses and translated by any synthetic procedure performed inside our brains. This theory seems to be basically undeniable today and could be accepted by most. In modern philosophy, psychology and all sciences that deal with vision and visual perception (in medicine and in robotics or mechanics), this reflection is now a basis for developing new theories and methods upon which to build vision theories, or to develop artificial (machine) vision, or to design algorithms to adapt systems to our visual perception and limitations. One of the main philosophical questions that still hold today concerns the insight that while the picture we perceive is the result of processes of our brain and created within it, we are able to distinguish this picture from ourselves and perceive its content as an external surrounding world (Plato 2002; Lehar 2016). Similarly, problems of concern to psychologists, biologists, medical researchers and engineers, as well as those involved in the cognitive sciences, have to do with modeling of human vision to better understand the mechanisms involved in order to implement them in machine vision systems and in visual information processing applications. The important point here is to keep in mind that the final arbiter, the ultimate judge, is always the human observer, who is to benchmark all developed visual information management systems. Thus, processes such as the comparison between different images, or images produced by processing an initial image, along with concepts such as the image quality are so subjective that it is almost impossible to © Springer Nature Singapore Pte Ltd. 2017 G. Pavlidis, Mixed Raster Content, Signals and Communication Technology, DOI 10.1007/978-981-10-2830-4_1
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1 Vision and Color Theory
establish a frame of reference beyond a subjective human observer. And this, perhaps because the problem of modeling the vision and understanding the root causes for which something looks ‘nicer’ than something else is quite complicated and difficult. If one accepts the theory of Plato that our perception shows us only a pale imitation, ‘a shadow’ of the real world (the ‘ideal’), then we understand how difficult it is to develop theories and methods for the assessment (even the very concept) of quality in such a world. It is true that the human eye and its operation has raised many debates and has caused the creation of several studies and publications for over two millennia. The key however, to better understand the main concepts in vision is considered to have been found in 16
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