用python读取图像_Python读取图片属性信息的实现方法
本文是利用Python腳本讀取圖片信息，有幾個(gè)說(shuō)明如下：
1、沒(méi)有實(shí)現(xiàn)錯(cuò)誤處理
2、沒(méi)有讀取所有信息，大概只有 GPS 信息、圖片分辨率、圖片像素、設(shè)備商、拍攝設(shè)備等
3、簡(jiǎn)單修改后應(yīng)該能實(shí)現(xiàn)暴力修改圖片的 GPS 信息
4、但對(duì)于本身沒(méi)有 GPS 信息的圖片，實(shí)現(xiàn)則非常復(fù)雜，需要仔細(xì)計(jì)算每個(gè)描述符的偏移量
腳本運(yùn)行后，讀取結(jié)果如下
腳本讀取的信息
這里和 Windows 屬性查看器讀到的內(nèi)容完全一致
圖片信息1
圖片信息2
源碼如下
# -*- coding:utf-8 -*-
import binascii
class ParseMethod(object):
@staticmethod
def parse_default(f, count, offset):
pass
@staticmethod
def parse_latitude(f, count, offset):
old_pos = f.tell()
f.seek(12 + offset)
latitude = [0,0,0]
for i in xrange(count):
byte = f.read(4)
numerator = byte.encode('hex')
byte = f.read(4)
denominator = byte.encode('hex')
latitude[i] = float(int(numerator, 16)) / int(denominator, 16)
print 'Latitude:\t%.2f %.2f\' %.2f\"' % (latitude[0], latitude[1], latitude[2])
f.seek(old_pos)
@staticmethod
def parse_longtitude(f, count, offset):
old_pos = f.tell()
f.seek(12 + offset)
longtitude = [0,0,0]
for i in xrange(count):
byte = f.read(4)
numerator = byte.encode('hex')
byte = f.read(4)
denominator = byte.encode('hex')
longtitude[i] = float(int(numerator, 16)) / int(denominator, 16)
print 'Longtitude:\t%.2f %.2f\' %.2f\"' % (longtitude[0], longtitude[1], longtitude[2])
f.seek(old_pos)
@staticmethod
def parse_make(f, count, offset):
old_pos = f.tell()
f.seek(12 + offset)
byte = f.read(count)
a = byte.encode('hex')
print 'Make:\t\t' + binascii.a2b_hex(a)
f.seek(old_pos)
@staticmethod
def parse_model(f, count, offset):
old_pos = f.tell()
f.seek(12 + offset)
byte = f.read(count)
a = byte.encode('hex')
print 'Model:\t\t' + binascii.a2b_hex(a)
f.seek(old_pos)
@staticmethod
def parse_datetime(f, count, offset):
old_pos = f.tell()
f.seek(12 + offset)
byte = f.read(count)
a = byte.encode('hex')
print 'DateTime:\t' + binascii.a2b_hex(a)
f.seek(old_pos)
# rational data type, 05
@staticmethod
def parse_xresolution(f, count, offset):
old_pos = f.tell()
f.seek(12 + offset)
byte = f.read(4)
numerator = byte.encode('hex')
byte = f.read(4)
denominator = byte.encode('hex')
xre = int(numerator, 16) / int(denominator, 16)
print 'XResolution:\t' + str(xre) + ' dpi'
f.seek(old_pos)
@staticmethod
def parse_yresolution(f, count, offset):
old_pos = f.tell()
f.seek(12 + offset)
byte = f.read(4)
numerator = byte.encode('hex')
byte = f.read(4)
denominator = byte.encode('hex')
xre = int(numerator, 16) / int(denominator, 16)
print 'YResolution:\t' + str(xre) + ' dpi'
f.seek(old_pos)
@staticmethod
def parse_exif_ifd(f, count, offset):
old_pos = f.tell()
f.seek(12 + offset)
byte = f.read(2)
a = byte.encode('hex')
exif_ifd_number = int(a, 16)
for i in xrange(exif_ifd_number):
byte = f.read(2)
tag_id = byte.encode('hex')
#print tag_id,
byte = f.read(2)
type_n = byte.encode('hex')
#print type_n,
byte = f.read(4)
count = byte.encode('hex')
#print count,
byte = f.read(4)
value_offset = byte.encode('hex')
#print value_offset
value_offset = int(value_offset, 16)
EXIF_IFD_DICT.get(tag_id, ParseMethod.parse_default)(f, count, value_offset)
f.seek(old_pos)
@staticmethod
def parse_x_pixel(f, count, value):
print 'X Pixels:\t' + str(value)
@staticmethod
def parse_y_pixel(f, count, value):
print 'y Pixels:\t' + str(value)
@staticmethod
def parse_gps_ifd(f, count, offset):
old_pos = f.tell()
f.seek(12 + offset)
byte = f.read(2)
a = byte.encode('hex')
gps_ifd_number = int(a, 16)
for i in xrange(gps_ifd_number):
byte = f.read(2)
tag_id = byte.encode('hex')
#print tag_id,
byte = f.read(2)
type_n = byte.encode('hex')
#print type_n,
byte = f.read(4)
count = byte.encode('hex')
#print count,
byte = f.read(4)
value_offset = byte.encode('hex')
#print value_offset
count = int(count, 16)
value_offset = int(value_offset, 16)
GPS_IFD_DICT.get(tag_id, ParseMethod.parse_default)(f, count, value_offset)
f.seek(old_pos)
IFD_dict = {
'010f' : ParseMethod.parse_make ,
'0110' : ParseMethod.parse_model ,
'0132' : ParseMethod.parse_datetime ,
'011a' : ParseMethod.parse_xresolution ,
'011b' : ParseMethod.parse_yresolution ,
'8769' : ParseMethod.parse_exif_ifd ,
'8825' : ParseMethod.parse_gps_ifd
}
EXIF_IFD_DICT = {
'a002' : ParseMethod.parse_x_pixel ,
'a003' : ParseMethod.parse_y_pixel
}
GPS_IFD_DICT = {
'0002' : ParseMethod.parse_latitude ,
'0004' : ParseMethod.parse_longtitude
}
with open('image.jpg', 'rb') as f:
byte = f.read(2)
a = byte.encode('hex')
print 'SOI Marker:\t' + a
byte = f.read(2)
a = byte.encode('hex')
print 'APP1 Marker:\t' + a
byte = f.read(2)
a = byte.encode('hex')
print 'APP1 Length:\t' + str(int(a, 16)) + ' .Dec'
byte = f.read(4)
a = byte.encode('hex')
print 'Identifier:\t' + binascii.a2b_hex(a)
byte = f.read(2)
a = byte.encode('hex')
print 'Pad:\t\t' + a
print 'Begin to print Header.... '
print 'APP1 Body: '
byte = f.read(2)
a = byte.encode('hex')
print 'Byte Order:\t' + a
byte = f.read(2)
a = byte.encode('hex')
print '42:\t\t' + a
byte = f.read(4)
a = byte.encode('hex')
print '0th IFD Offset:\t' + a
print 'Finish print Header'
print 'Begin to print 0th IFD....'
#print 'Total: ',
byte = f.read(2)
a = byte.encode('hex')
interoperability_number = int(a, 16)
#print interoperability_number
for i in xrange(interoperability_number):
byte = f.read(2)
tag_id = byte.encode('hex')
#print tag_id,
byte = f.read(2)
type_n = byte.encode('hex')
#print type_n,
byte = f.read(4)
count = byte.encode('hex')
#print count,
byte = f.read(4)
value_offset = byte.encode('hex')
#print value_offset
count = int(count, 16)
value_offset = int(value_offset, 16)
# simulate switch
IFD_dict.get(tag_id, ParseMethod.parse_default)(f, count, value_offset)
print 'Finish print 0th IFD....'
總結(jié)
利用Python讀取圖片屬性信息的實(shí)現(xiàn)方法到這就基本結(jié)束了，大家都學(xué)會(huì)了嗎？希望這篇文章對(duì)大家的學(xué)習(xí)或者工作帶來(lái)一定的幫助，
本文標(biāo)題: Python讀取圖片屬性信息的實(shí)現(xiàn)方法
本文地址: http://www.cppcns.com/jiaoben/python/163242.html
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