Mach Bands and Density Perception

Lane, Edward J.; Proto, Anthony V.; Phillips, T. W.

doi:10.1148/121.1.9

Cited by 63 publications

(23 citation statements)

References 5 publications

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“…Th is optical illusion is named after Ernst Mach, a physicist who described the sign in 1865. It occurs due to spatial high-boost fi ltering by the human visual system on the image captured by the light receptors in the retina, where a phenomenon called lateral inhibition occurs (1). Th is is an edge enhancement method to facilitate the detection of edges of an object.…”

Section: Discussionmentioning

confidence: 99%

Mach Band Sign: An Optical Illusion

Panikkath

2014

Baylor University Medical Center Proceedings

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Section: Discussionmentioning

confidence: 99%

Mach Band Sign: An Optical Illusion

Panikkath

2014

Baylor University Medical Center Proceedings

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“…The test patterns used in this study consisted of two adjacent 5 cm 9 10 cm rectangles with different gray levels. When observers viewed these test patterns, they must have been influenced by the Mach effect [14].…”

Section: Discussionmentioning

confidence: 99%

Need for liquid–crystal display monitors having the capability of rendering higher than 8 bits in display-bit depth

Hiwasa

Morishita

Hatanaka

et al. 2009

Radiol Phys Technol

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Our purpose in this study was to examine the potential usefulness of liquid-crystal display (LCD) monitors having the capability of rendering higher than 8 bits in display-bit depth. An LCD monitor having the capability of rendering 8, 10, and 12 bits was used. It was calibrated to the grayscale standard display function with a maximum luminance of 450 cd/m(2) and a minimum of 0.75 cd/m(2). For examining the grayscale resolution reported by ten observers, various simple test patterns having two different combinations of luminance in 8, 10, and 12 bits were randomly displayed on the LCD monitor. These patterns were placed on different uniform background luminance levels, such as 0, 50, and 100%, for maximum luminance. All observers participating in this study distinguished a smaller difference in luminance than one gray level in 8 bits irrespective of background luminance levels. As a result of the adaptation processes of the human visual system, observers distinguished a smaller difference in luminance as the luminance level of the test pattern was closer to the background. The smallest difference in luminance that observers distinguished was four gray levels in 12 bits, i.e., one gray level in 10 bits. Considering the results obtained by use of simple test patterns, medical images should ideally be displayed on LCD monitors having 10 bits or greater so that low-contrast objects with small differences in luminance can be detected and for providing a smooth gradation of grayscale.

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“…It was often seen as just a hair-thin white line. Attention was paid to the fact that Mach effects might be mistaken for sclerosis (Lane et al 1976). …”

Section: Operationmentioning

confidence: 99%