如题
import cv2
import numpy as np
def rgbe2float(rgbe):
res = np.zeros((rgbe.shape[0],rgbe.shape[1],3))
p = rgbe[:,:,3]>0
m = 2.0**(rgbe[:,:,3][p]-136.0)
res[:,:,0][p] = rgbe[:,:,0][p] * m
res[:,:,1][p] = rgbe[:,:,1][p] * m
res[:,:,2][p] = rgbe[:,:,2][p] * m
return resdef readHdr(fileName = 'belgium.hdr'):
fileinfo = {}
with open(fileName, 'rb') as fd:
tline = fd.readline().strip()
if len(tline)<3 or tline[:2] != '#?':
print 'invalid header'
return
fileinfo['identifier'] = tline[2:] tline = fd.readline().strip()
while tline:
n = tline.find('=')
if n>0:
fileinfo[tline[:n].strip()] = tline[n+1:].strip()
tline = fd.readline().strip() tline = fd.readline().strip().split(' ')
fileinfo['Ysign'] = tline[0][0]
fileinfo['height'] = int(tline[1])
fileinfo['Xsign'] = tline[2][0]
fileinfo['width'] = int(tline[3]) data = [ord(d) for d in fd.read()]
height, width = fileinfo['height'], fileinfo['width']
if width<8 or width>32767:
data.resize((height, width, 4))
return rgbe2float(data) img = np.zeros((height, width, 4))
dp = 0
for h in range(height):
if data[dp] !=2 or data[dp+1]!=2:
print 'this file is not run length encoded'
print data[dp:dp+4]
return
if data[dp+2]*256+ data[dp+3] != width:
print 'wrong scanline width'
return
dp += 4
for i in range(4):
ptr = 0
while(ptr < width):
if data[dp]>128:
count = data[dp]-128
if count==0 or count>width-ptr:
print 'bad scanline data'
img[h, ptr:ptr+count,i] = data[dp+1]
ptr += count
dp += 2
else:
count = data[dp]
dp += 1
if count==0 or count>width-ptr:
print 'bad scanline data'
img[h, ptr:ptr+count,i] = data[dp: dp+count]
ptr += count
dp +=count
return rgbe2float(img)
if __name__ == '__main__':
m = readHdr()
m1,m2 = m.max(), m.min()
img = (m-m2)/(m1-m2)
m1 = m[:,:,0].copy(); m[:,:,0] = m[:,:,2]; m[:,:,2]=m1
cv2.imwrite('tmp.jpg', img*255)
