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revision 1.62 by tjl, Fri Nov 22 15:23:11 2002 UTC revision 1.63 by jvk, Fri Nov 22 16:03:44 2002 UTC
# Line 202  of unique textures for distinguishing vi Line 202  of unique textures for distinguishing vi
202  %  %
203  % Used for  % Used for
204  %     Aid to visualizing surfaces\cite{schweitzer83texturing},  %     Aid to visualizing surfaces\cite{schweitzer83texturing},
205    %     (simple local features in artificial %textures are used for
206    %     implying global surface shape)
207  %     various graphics operations\cite{haeberli93texture},  %     various graphics operations\cite{haeberli93texture},
208  %  %
209  % Synthesized using  % Synthesized using
# Line 244  In visual cortex, there are cells sensit Line 246  In visual cortex, there are cells sensit
246  frequencies, orientations, and locations in the visual field.  frequencies, orientations, and locations in the visual field.
247  A good mathematical model for the sensitivity of the receptive fields is  A good mathematical model for the sensitivity of the receptive fields is
248  Gabor function, i.e., a two-dimensional Gaussian-modulated sinusoid.  Gabor function, i.e., a two-dimensional Gaussian-modulated sinusoid.
249    
250  On a higher level, correlating local feature are combined  On a higher level, correlating local feature are combined
251  to global perception.  to global perception.
252  For example, contours are formed from consistent directions  For example, contours are formed from consistent directions
253  of adjacent receptive fields.  of adjacent receptive fields and different objects are
254    perceived.
 In \cite{schweitzer83texturing}, simple local features in artificial  
 textures are used for implying global surface shape. XXX  
   
255  The higher levels of visual processing are no longer hierarchical  The higher levels of visual processing are no longer hierarchical
256  and not throughly understood.  and not throughly understood.
257    Theories of structural object perception (e.g. \cite{biederman87})
258    propose certain primitive shapes whose structure facilities recognition.
259    
260  We simply assume that the intensities of different features,  We simply assume that the intensities of different features,
261  such as local and global shapes and colors, form a \emph{feature vector},  such as local and global shapes and colors, form a \emph{feature vector},
262  which facilitates recognition and memorization of images.  which facilitates recognition and memorization of images.

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