Color Appearance Models, 2nd edition (The Wiley-IS&T Series by Mark D. Fairchild

By Mark D. Fairchild

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Weber’s result is quite intuitive. For example, imagine carrying a few sheets of paper and then adding a 20-page document to the load. Clearly the difference between the two weights would be perceived.

If the initial magnitude of the stimulus (weight in this case) is denoted I, and the change required to achieve a threshold is denoted ∆I, Weber’s results can be expressed by stating that the ratio ∆I/I is constant. In fact, this general relationship holds approximately true for many perceptual stimuli and has come to be known as Weber’s law. Weber’s result is quite intuitive. For example, imagine carrying a few sheets of paper and then adding a 20-page document to the load. Clearly the difference between the two weights would be perceived.

To represent the physiological properties of these cells, the concept of receptive fields becomes useful. A receptive field is a graphical representation of the area in the visual field to which a given cell responds. , positive, negative, spectral bias) is typically indicated for various regions in the receptive field. As a simple example, the receptive field of a photoreceptor is a small circular area representing the size and location of that particular receptor’s sensitivity in the visual field. 9 represents some prototypical receptive fields for ganglion cells.

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