A model for early motion compensation

Albert Ahumada
NASA Ames Research Center

     Full text: Not available
     Last modified: July 15, 2007

Abstract
Motion compensation is similar to stereo disparity evaluation in that a multitude of possible motions or possible disparities must be considered. Freeman and Ohzawa (1990) showed that pairs of Gabor receptive fields in quadrature phase can convert the disparity search problem into a phase difference measurement problem. Qian and Anderson (1997) use this representation to compute both stereo disparity and motion energy. A mechanism is proposed for early motion compensation (blur reduction) in visual cortex using quadrature pairs of receptive fields and a motion signal. Image samples are temporally combined by oscillating filters tuned for the image speed and the receptive field spatial frequency. A 1-D version of the model is simulated with a Gabor pyramid and single-tuned oscillators.