Figure 5.

The PBSr model. Encoding phase: The image is subjected to a multiscale and multi-orientation decomposition from which it derives an estimate of the orientation of the image, θ_max, relative to the target (see text). It rotates the original (nondecomposed) image so that its maximum power subband is aligned with that of the target. The vectorized, rotated, intensity-based representation (of the original, nondecomposed image), m, constitutes the search template. Template response: An intensity-based representation, t, of the target image is formed, as in the PBS model, and correlated with m. The result is rectified, passed through a power function, and corrupted by additive noise, N_c, yielding noisy scalar response value, . Decision phase: The observer derives a similar response, , to the distractor and compares it to r^M. The stimulus yielding the maximum response is the observer's choice for the match stimulus.