Created
May 29, 2013 14:51
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import pywt, numpy | |
import Image | |
from sys import argv | |
import time | |
def crear_imagen(cef,esg): #Pasa los coeficientes a un filtro | |
for cs,i in enumerate(cef): | |
binariza(i,cs) | |
# raw_input() | |
def cef(array): #aplicar tranformada discreta de wavelets | |
data = array | |
#print 'data', data | |
coeffs = pywt.dwt2(data, 'Haar') | |
csA, (csH, csV, csD) = coeffs | |
print 'Coefic 1' | |
print csA | |
print 'Coefic 2' | |
print csH | |
print 'Coefic 3' | |
print csV | |
print 'Coefic 4' | |
print csD | |
return (csA,csH,csV,csD),coeffs | |
def escala_g(image): #convierte la imagen a escala de grises | |
imagen = image.load() | |
ancho,alto = image.size | |
for i in range(ancho): | |
for j in range(alto): | |
(r,g,b) = image.getpixel((i,j)) | |
esg = (r+g+b)/3 | |
imagen[i,j] = (esg,esg,esg) | |
df = image.save('escala.png') | |
return image | |
def toma_array(esg): # toma matriz de coeficientes | |
ancho,alto=esg.size | |
imagen=esg.load() | |
m = numpy.empty((ancho, alto)) | |
for i in range(ancho): | |
for j in range(alto): | |
(r,g,b) = esg.getpixel((i,j)) | |
m[i,j]=r | |
return m | |
def conversion_array(image): | |
matriz = numpy.fromstring(image.tostring(), numpy.uint8) | |
matriz.shape = (image.size[1], image.size[0], len(image.getbands())) | |
return matriz | |
def binariza(array,cs): #filtro para obtener valores menores | |
print array | |
ancho=len(array) | |
alto=len(array[0]) | |
val=0 | |
im = Image.new('RGB', (ancho, alto), (255, 255, 255)) | |
im.save('nuevab.png') | |
imagen=im.load() | |
for i in range(ancho): | |
for j in range(alto): | |
if array[i,j]<0: | |
val = 0 | |
elif array[i,j]>255: | |
val= 255 | |
else: | |
val=int(array[i,j]) | |
imagen[i,j]=(val,val,val) | |
im.save('coef'+str(cs)+'.png') | |
def descomprimir(cs,esg): #imagen final comprimida | |
d=pywt.idwt2(cs, 'haar') | |
imagen=esg.load() | |
ancho,alto=esg.size | |
for i in range(ancho): | |
for j in range(alto): | |
imagen[i,j]=(int(d[i,j]),int(d[i,j]),int(d[i,j])) | |
esg.save('descomprimida.png') | |
def main(): #aplica funciones a la imagen | |
size=(400,400) | |
img=Image.open(argv[1]) | |
esg=escala_g(img) | |
esg.thumbnail(size, Image.ANTIALIAS) | |
m=toma_array(esg) | |
cs,cof=cef(m) | |
crear_imagen(cs,esg) | |
descomprimir(cof,esg) | |
cs,cof=cef(cs[0]) | |
crear_imagen(cs,esg) | |
cs,cof=cef(cs[0]) | |
crear_imagen(cs,esg) | |
esg.save('Image.png') | |
main() |
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