initial sd-vbs

initial sd-vbs

add sd-vbs

sd-vbs

1 files changed, 100 insertions, 0 deletions

diff --git a/SD-VBS/benchmarks/texture_synthesis/src/matlab/buildWpyr.m b/SD-VBS/benchmarks/texture_synthesis/src/matlab/buildWpyr.m
new file mode 100755
index 0000000..22ae32f
--- /dev/null
+++ b/SD-VBS/benchmarks/texture_synthesis/src/matlab/buildWpyr.m
@@ -0,0 +1,100 @@
+% [PYR, INDICES] = buildWpyr(IM, HEIGHT, FILT, EDGES)
+%
+% Construct a separable orthonormal QMF/wavelet pyramid on matrix (or vector) IM.
+%
+% HEIGHT (optional) specifies the number of pyramid levels to build. Default
+% is maxPyrHt(IM,FILT).  You can also specify 'auto' to use this value.
+%
+% FILT (optional) can be a string naming a standard filter (see
+% namedFilter), or a vector which will be used for (separable)
+% convolution.  Filter can be of even or odd length, but should be symmetric. 
+% Default = 'qmf9'.  EDGES specifies edge-handling, and
+% defaults to 'reflect1' (see corrDn).
+%
+% PYR is a vector containing the N pyramid subbands, ordered from fine
+% to coarse.  INDICES is an Nx2 matrix containing the sizes of
+% each subband.  This is compatible with the MatLab Wavelet toolbox.
+
+% Eero Simoncelli, 6/96.
+
+function [pyr,pind] = buildWpyr(im, ht, filt, edges)
+
+if (nargin < 1)
+  error('First argument (IM) is required');
+end
+
+%------------------------------------------------------------
+%% OPTIONAL ARGS:
+
+if (exist('filt') ~= 1)
+  filt = 'qmf9';
+end
+
+if (exist('edges') ~= 1)
+  edges= 'reflect1';
+end
+
+if isstr(filt)
+  filt = namedFilter(filt);
+end
+
+if ( (size(filt,1) > 1) & (size(filt,2) > 1) )
+  error('FILT should be a 1D filter (i.e., a vector)');
+else
+  filt = filt(:);
+end
+
+hfilt = modulateFlip(filt);
+
+% Stagger sampling if filter is odd-length:
+if (mod(size(filt,1),2) == 0)
+  stag = 2;
+else
+  stag = 1;
+end
+
+im_sz = size(im);
+
+max_ht = maxPyrHt(im_sz, size(filt,1));
+if ( (exist('ht') ~= 1) | (ht == 'auto') )
+  ht = max_ht;
+else
+  if (ht > max_ht)
+    error(sprintf('Cannot build pyramid higher than %d levels.',max_ht));
+  end
+end
+
+if (ht <= 0)
+
+  pyr = im(:);
+  pind = im_sz;
+
+else
+
+  if (im_sz(2) == 1)
+    lolo = corrDn(im, filt, edges, [2 1], [stag 1]);
+    hihi = corrDn(im, hfilt, edges, [2 1], [2 1]);
+  elseif (im_sz(1) == 1)
+    lolo = corrDn(im, filt', edges, [1 2], [1 stag]);
+    hihi = corrDn(im, hfilt', edges, [1 2], [1 2]);
+  else
+    lo = corrDn(im, filt, edges, [2 1], [stag 1]);
+    hi = corrDn(im, hfilt, edges, [2 1], [2 1]);
+    lolo = corrDn(lo, filt', edges, [1 2], [1 stag]);
+    lohi = corrDn(hi, filt', edges, [1 2], [1 stag]); % horizontal
+    hilo = corrDn(lo, hfilt', edges, [1 2], [1 2]); % vertical
+    hihi = corrDn(hi, hfilt', edges, [1 2], [1 2]); % diagonal
+  end
+
+  [npyr,nind] = buildWpyr(lolo, ht-1, filt, edges);
+
+  if ((im_sz(1) == 1) | (im_sz(2) == 1))
+    pyr = [hihi(:); npyr];
+    pind = [size(hihi); nind];
+  else
+    pyr = [lohi(:); hilo(:); hihi(:); npyr];
+    pind = [size(lohi); size(hilo); size(hihi); nind];
+  end
+
+end
+