74 lines
1.9 KiB
Python
74 lines
1.9 KiB
Python
import numpy as np
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import re
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import sys
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def read_pfm(filename):
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# rb: binary file and read only
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file = open(filename, 'rb')
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color = None
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width = None
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height = None
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scale = None
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endian = None
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header = file.readline().decode('utf-8').rstrip()
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if header == 'PF':
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color = True
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elif header == 'Pf': # depth is Pf
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color = False
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else:
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raise Exception('Not a PFM file.')
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dim_match = re.match(r'^(\d+)\s(\d+)\s$', file.readline().decode('utf-8')) # re is used for matching
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if dim_match:
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width, height = map(int, dim_match.groups())
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else:
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raise Exception('Malformed PFM header.')
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scale = float(file.readline().rstrip())
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if scale < 0: # little-endian
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endian = '<'
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scale = -scale
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else:
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endian = '>' # big-endian
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data = np.fromfile(file, endian + 'f')
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shape = (height, width, 3) if color else (height, width, 1)
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# depth: H*W
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data = np.reshape(data, shape)
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data = np.flipud(data)
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file.close()
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return data, scale
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def save_pfm(filename, image, scale=1):
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file = open(filename, "wb")
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color = None
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image = np.flipud(image)
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# print(image.shape)
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if image.dtype.name != 'float32':
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raise Exception('Image dtype must be float32.')
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if len(image.shape) == 3 and image.shape[2] == 3: # color image
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color = True
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elif len(image.shape) == 2 or len(image.shape) == 3 and image.shape[2] == 1: # greyscale
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color = False
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else:
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raise Exception('Image must have H x W x 3, H x W x 1 or H x W dimensions.')
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file.write('PF\n'.encode('utf-8') if color else 'Pf\n'.encode('utf-8'))
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file.write('{} {}\n'.format(image.shape[1], image.shape[0]).encode('utf-8'))
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endian = image.dtype.byteorder
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if endian == '<' or endian == '=' and sys.byteorder == 'little':
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scale = -scale
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file.write(('%f\n' % scale).encode('utf-8'))
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image.tofile(file)
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file.close()
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