Fixed mapping or generating patches from images
B = IM_PATCH(A,PSIZE,PNUM,TYPE)
B = IM_PATCH(A,PSIZE,COORD,'user')
B = A*IM_PATCH(,PSIZE,PNUM,TYPE)
B = A*IM_PATCH(PSIZE,PNUM,TYPE)
| A|| Dataset or datafile with (multi-band) object images dataset|
| PSIZE|| 2-dimensional patch size. If PSIZE is a scalar, square patches of size PSIZE x PSIZE are generated. In case PSIZE < 1, it is taken relative to the images size. In this case patches may become non-square for non-square images. Default 3 x 3.|
| PNUM|| Number of patches, see TYPE, default 1.|
| COORD|| Given set of N x 2 image coordinates of patch centra. This may be given either in pixels (ANY(COORD > 1) or relative to the image size (ALL(COORD <= 1).|
| TYPE|| 'syst': systematic sampling generating PNUM x PNUM patches. 'rand': generation of a random set of PNUM patches. 'user': user defined patch positions, see COORD. Default: 'syst'.|
| B|| Resulting dataset or datafile with the same number of objects as in A. Single images are replaced by the patches.|
The object images (including their N bands) are sampled and windows of size PSIZE are generated, replacing the original image object. They are stored as [PSIZE(1) PSIZE(2) NUM*N] image objects, in which N is the original number of bands and NUM is either PNUM (for TYPE is 'rand' or 'user') or PNUM x PNUM (for TYPE is 'syst').
By BAND2OBJ(B,N) individual patches can be transformed into objects.
b = im_patch(a,0.5) % generate just the central parts of the images
b = im_patch(a,[3 5],2) % generates 4 patches of size 3x5 in centra of
% the four quadrants
b = im_patch(a,0.1,10,'rand') % generate at random positions 10 patches
%each with a linear size of 0.1 of the image size.
datasets, datafiles, band2obj,
|This file has been automatically generated. If badly readable, use the help-command in Matlab.|