A neural network model of the ideal observer and the statistical efficiency analysis

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The purpose of this study was as follows : First, we calculate a statistical efficiency which reflects relative discriminability of the human visual system to that of an ideal observer in order to investigate some properties in lower to higher processes of the visual system. Secondly, we construct a neural network model of the ideal observer by learning a statistically optimal responses in visual tasks. Furthermore, we artificially disorder the network with use of an algorithm and make it to simulate the human performance.We obtained the following results :(1) We calculated the statistical efficiency in the task of detecting symmetry patterns on the three dimensional (3D) corrugate surface with depth noise. With using these results, we could build a model about a surface construction and pattern detection in it.(2) We studied a problem about an integration of motion parallax with binocular disparity in the 3D slant perception with use of measurement of the statistical efficiency. We made clear the sampling differences between the motion parallax and binocular disparity information.(3) We studied a spatial and temporal summation of orientations of lines with use of measurements of the statical efficiency, and clarified the mechanism of the temporal sampling superiority over the spatial sampling.(4) We constructed an learning algorithm which was a basis of the neural network model of the ideal observer.(5) With use of the above algorithm, we built a double-steps neural network model of the ideal observer in the structure-from-motion task.(6) We made an algorithm which causes some disorder in the network and simulates a human performance.