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improved entropy computation

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improved fitting algorithm



git-svn-id: https://callirhoe.googlecode.com/svn/trunk@134 81c8bb96-aa45-f2e2-0eef-c4fa4a15c6df
This commit is contained in:
geortz@gmail.com 2014-09-24 18:20:40 +00:00
parent 25c380c28d
commit 82d49ca099
1 changed files with 30 additions and 29 deletions
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49
calmagick.py
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@ -69,25 +69,26 @@ class PNMImage(object):
def block_avg(self, x, y, sz):
return float(sum([(self.xsum[y][x+sz] - self.xsum[y][x]) for y in range(y,y+sz)]))/(sz*sz)
def fit_rect(self, size_range = (0.333, 0.8), entropy_range = (9,16), improvement = 0.15):
def lowest_block_avg(self, sz, at_least = 0):
best = (self.maxval,1,0,0,sz) # avg, sz_ratio, x, y, sz
w,h = self.size
best = (self.maxval,1,0,0) # avg, sz, x, y
for sz in range(int(w*size_range[1]+0.5),int(w*size_range[0]+0.5)-1,-1):
for y in range(0,h-sz+1):
for x in range(0,w-sz+1):
cur = (self.block_avg(x,y,sz), float(sz)/w, x, y)
cur = (self.block_avg(x,y,sz), float(sz)/w, x, y, sz)
if cur[0] < best[0]:
# same size, always minimize
if cur[1] == best[1]:
best = cur
# print best
elif cur[0] > entropy_range[1] or 1-cur[0]/best[0] > improvement:
best = cur
# print best, "+"
if best[0] <= entropy_range[0]:
break
if best[0] <= at_least: return best
return best
def fit_rect(self, size_range = (0.333, 0.8), at_least = 7, relax = 0.2):
w,h = self.size
sz_range = (int(w*size_range[0]+0.5), int(w*size_range[1]+0.5))
best = self.lowest_block_avg(sz_range[0], at_least)
for sz in range(sz_range[1],sz_range[0],-1):
cur = self.lowest_block_avg(sz, at_least)
if cur[0] <= max(at_least, best[0]*(1+relax)): return cur + (best[0],)
return best + (best[0],) # avg, sz_ratio, x, y, sz, best_avg
_version = "0.1.0"
def get_parser():
@ -105,12 +106,10 @@ def get_parser():
help="set minimum calendar/photo size ratio [%default]")
parser.add_option("--max-size", type="float", default=0.8,
help="set maximum calendar/photo size ratio [%default]")
parser.add_option("--low-entropy", type="float", default=9,
help="set maximum entropy threshold (0-255) for early termination (0=global minimum) [%default]")
parser.add_option("--high-entropy", type="float", default=16,
help="set minimum entropy threshold (0-255) up to which smaller sizes are always tried [%default]")
parser.add_option("--improvement", type="float", default=0.15,
help="set minimum relative entropy improvement in order to try a smaller size [%default]")
parser.add_option("--low-entropy", type="float", default=7,
help="set minimum entropy threshold (0-255) for early termination (0=global minimum) [%default]")
parser.add_option("--relax", type="float", default=0.2,
help="relax minimum entropy multiplying by 1+RELAX, to allow for bigger sizes [%default]")
parser.add_option("--negative", type="float", default=100,
help="average luminosity (0-255) threshold of the overlaid area, below which a negative "
"overlay is chosen [%default]")
@ -174,11 +173,11 @@ if __name__ == '__main__':
# pnm_entropy = PNMImage(subprocess.check_output(['convert', img, '-scale', '2500>', '-colorspace', 'Gray',
# '-edge', str(options.edge), '-scale', resize, '-compress', 'None', 'pnm:-']).splitlines())
pnm_entropy = PNMImage(subprocess.check_output(['convert', img, '-scale', '512>', '(', '+clone',
'-blur', '0x%d' % options.edge, ')', '-compose', 'minus', '+swap', '-composite',
'-colorspace', 'Gray', '-scale', resize, '-normalize', '-compress', 'None', 'pnm:-']).splitlines())
'-blur', '0x%d' % options.edge, ')', '-compose', 'minus', '-composite',
'-colorspace', 'Gray', '-normalize', '-unsharp', '0x5', '-scale', resize, '-normalize', '-compress', 'None', 'pnm:-']).splitlines())
if options.verbose: print "Fitting... ",
best = pnm_entropy.fit_rect((options.min_size,options.max_size),
(options.low_entropy,options.high_entropy), options.improvement)
best = pnm_entropy.fit_rect((options.min_size,options.max_size), options.low_entropy, options.relax)
if options.verbose: print best
nw, nh = int(w*best[1]), int(h*best[1])
@ -198,19 +197,21 @@ if __name__ == '__main__':
if options.test or options.test_rect:
sys.exit(0)
if options.verbose: print "Measuring luminance... ",
# pnm_lum = PNMImage(subprocess.check_output(['convert', img, '-colorspace', 'HSL', '-channel', 'B', '-separate',
# '-colorspace', 'Gray', '-scale', resize, '-compress', 'None', 'pnm:-']).splitlines())
pnm_lum = PNMImage(subprocess.check_output(['convert', img, '-colorspace', 'Gray',
'-scale', resize, '-compress', 'None', 'pnm:-']).splitlines())
luma = pnm_lum.block_avg(best[2], best[3], int(best[1]*pnm_lum.size[0] + 0.5))
luma = pnm_lum.block_avg(*best[2:5])
#print 'luma =', luma
negative = luma < options.negative
if options.verbose: print "DARK" if negative else "LIGHT"
if options.verbose: print "Generating calendar image (transparent)..."
run_callirhoe('mono_transparent', nw, nh, argv2, '_transparent_cal.png');
if options.verbose: print "Composing overlay...%s" % (' (negative)' if negative else '')
if options.verbose: print "Composing overlay..."
overlay = ['(', '-negate', '_transparent_cal.png', ')'] if negative else ['_transparent_cal.png']
subprocess.call(['convert', img, '-region', '%dx%d+%d+%d' % (nw,nh,dx,dy)] +
([] if options.brightness == 0 else ['-brightness-contrast', '%d' % (-options.brightness if negative else options.brightness)]) +