imagedesc

 Runs descriptor on a set of images, optionally jitters, and optionally applies PCA.

 Parameters are passed in w struct imdesc.  Use imagedesc_generate to quickly generate
 this struct. 

 If clusters (and optionally csigma) are provided, imagedesc2clusters is applied to each
 resulting desc (giving a new descriptor).  See imagedesc2clusters for more information.

 INPUTS
   I               - 2D or 3D array of images, or 3D or 4D array of cuboids
   imdesc          - struct containing the following fields:
       iscuboid        - specifies whether desc is designed for image or cuboid
       fun_desc        - (fhandle) descriptor to apply to each image or cuboid
       par_desc        - parameters for above descriptor
       par_jitter      - [optional] parameters for jittering images or cuboids
       par_pca         - [optional] parameters for PCA to reduce dim of descriptor
       clusters        - [optional] see imagedesc2clusters 
       csigma          - [optional] see imagedesc2clusters 
   show            - [optional] figure to use for display (no display if == 0)
   
 OUTPUTS
   desc        - nxpxr array of n p-dimensional descriptors, r jittered versions of each
               - nxp array if par_jitter is not given or clusters is given

 See also IMAGEDESC_GENERATE, IMAGEDESC_DEMO, IMAGEDESC2CLUSTERS