Topic
Contrast (vision)
About: Contrast (vision) is a research topic. Over the lifetime, 10379 publications have been published within this topic receiving 221480 citations.
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TL;DR: A novel homogeneity measurement is proposed and utilize it to define and enhance the contrast and the results prove that the proposed method has better performance than the existing methods, no over-enhancement/under-enhancesment and more robust.
65 citations
01 May 2002
TL;DR: Iridigm has produced the first color MEMS based reflective display as mentioned in this paper, which exhibits good contrast and high brightness with response times of 35 microseconds at extremely low power consumption.
Abstract: Iridigm has produced the first color MEMS based reflective display. With dimensions of 240 × 160 pixels at 100 dpi, it exhibits good contrast and high brightness. Response times of 35 microseconds have been achieved at exceptionally low power consumption, and there is no active matrix. The status of this technology will be discussed.
65 citations
TL;DR: It is suggested that contrast sensitivity deficits in diabetic patients without retinopathy are not solely explained by a diabetes-induced increases in lens optical density.
Abstract: • Background: Psychophysical tests in patients with diabetes mellitus reveal deficits of central vision before the development of overt retinopathy. We evaluated the contrast sensitivity thresholds in 30 patients with type 11 diabetes mellitus and without retinopathy, taking into account the crystalline lens density. Risk factors for contrast sensitivity deficits were investigated. • Methods: Contrast sensitivity was compared in 30 aretinopathic diabetic patients and age-matched controls. Contrast thresholds were determined for stationary gratings at three spatial frequencies (6, 15, and 27 cycles/deg) and for mesopic (5 cd/m2) and low photopic (85 cd/m2) vision. Lens density was measured using a IntraOptics opacity lensmeter.
65 citations
TL;DR: Psychophysical measurements were made following adaptation to gratings in order to test the hypothesis that adaptation to patterned features of visual stimulation serves a function analogous to the changes in retinal function during light and dark adaptation.
65 citations
TL;DR: It is proposed that an opponent-orientation process and a opponent-position process can both contribute to vernier judgements for motion-defined objects.
Abstract: Some objects are perfectly camouflaged when stationary, but are clearly visible when moving; the boundaries of such an object are defined entirely by motion parallax. Little is known about the eye's ability to make spatial discriminations between motion-defined objects. In this study, subjects viewed a pseudorandom pattern of dots within which a camouflaged bar was made visible by relative motion of dots. Vernier acuity for the motion-defined bar was 27-45 sec arc for three subjects, much less than the interdot separation of 360 sec arc, much less than the 2 deg receptive field size for motion, and comparable with the foveal intercone separation of 30 sec arc. It is proposed that an opponent-orientation process and an opponent-position process can both contribute to vernier judgements for motion-defined objects. Real-world motion contrast commonly confounds the following cues for figure-ground segregation: (1) different texture velocities on either side of the figure's boundary; (2) in any given time interval, texture in figure and ground moves different distances; and (3) texture continually appears and disappears along the figure's boundary. When cues (2) and (3) were eliminated, thus ensuring figure-ground segregation was achieved entirely by motion-sensitive neural elements, vernier acuity was 44 ± 5 sec arc compared with 36 ± 8 sec arc for a dotted bar defined by luminance contrast. Conclusion: Vernier acuity for a dotted bar whose boundary was defined entirely by motion-sensitive neural elements was similar to vernier acuity for a dotted bar whose boundary was defined by luminance contrast.
65 citations