SURROUND EVALUATION, 1999

Properties of a Center/surround Retinex Part Two: Surround Design

The last version of Edwin Land's retinex model for human vision's lightness and color constancy has been implemented. Previous research has established the mathematical foundations of Land's retinex but has not examined speciic design issues and their eeects on the properties of the retinex operation. We have sought to deene a practical implementation of the retinex without particular concern f...

Considering the Surround

When viewing images, the relative luminance of the surround has a profound impact on the apparent contrast of the image. For this reason, photographic transparencies intended for projection in a darkened room are produced with an objective contrast substantially higher than that necessary for optimum reproduction as prints viewed in an illuminated surround. The dark surround causes the image el...

Surround with Fewer Speakers

Multichannel audio is now widely available to the consumer. These multichannel formats demand numerous loudspeakers. While five or more loudspeakers in the room may be acceptable to the enthusiast, to the normal consumer this is an undesirable compromise. A more widely acceptable compromise, however, is likely to be a small reduction in the surround performance in exchange for fewer 'boxes' aro...

Surround-contingent motion aftereffect

We investigated whether motion aftereffects (MAE) can be contingent on surroundings. Random dots moving leftward and rightward were presented in alternation. Moving dots were surrounded by an open circle or an open square. After prolonged exposure to these stimuli, MAE were found to be contingent upon the surrounding frames: dots moving in a random direction appeared moving leftward when surrou...

Keddie, Iran and Surround