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from PIL import Image
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def makeImageEven(image):
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"""
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将图像像素值变为偶数值（最低有效位为0）
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"""
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# 获取图像所有像素值的列表：[(r,g,b,t),(r,g,b,t)...]
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pixels = list(image.getdata())
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# 将所有像素值变为偶数（通过移位）
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evenPixels = [(r >> 1 << 1, g >> 1 << 1, b >> 1 << 1, t >> 1 << 1) for [r, g, b, t] in pixels]
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# 创建一个与原图像大小相同的副本
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evenImage = Image.new(image.mode, image.size)
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# 将偶数像素值放入副本中
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evenImage.putdata(evenPixels)
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return evenImage
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def constLenBin(int):
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"""
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返回固定长度的二进制字符串，替代内置函数bin()
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"""
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# 使用二进制表示整数，不足8位在左侧补0
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binary = "0" * (8 - (len(bin(int)) - 2)) + bin(int).replace('0b', '')
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return binary
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def encodeDataInImage(image, data):
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"""
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将字符串编码到图片中
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"""
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# 获取最低有效位为0的图片副本
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evenImage = makeImageEven(image)
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# 将需要隐藏的字符串转换成二进制字符串
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binary = ''.join(map(constLenBin, bytearray(data, 'utf-8')))
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if len(binary) > len(image.getdata()) * 4:
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# 若无法编码全部数据，抛出异常
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raise Exception("Error: Can't encode more than" + len(evenImage.getdata()) * 4 + " bits in this image. ")
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# 将二进制信息编码进像素值中
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encodedPixels = [(r + int(binary[index * 4 + 0]), g + int(binary[index * 4 + 1]), b + int(binary[index * 4 + 2]),
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t + int(binary[index * 4 + 3])) if index * 4 < len(binary) else (r, g, b, t) for
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index, (r, g, b, t) in enumerate(list(evenImage.getdata()))]
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# 创建新图片以存放编码后的像素
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encodedImage = Image.new(evenImage.mode, evenImage.size)
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# 添加编码后的数据
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encodedImage.putdata(encodedPixels)
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return encodedImage
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def binaryToString(binary):
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"""
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从二进制字符串转为 UTF-8 字符串
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"""
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index = 0
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string = []
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rec = lambda x, i: x[2:8] + (rec(x[8:], i - 1) if i > 1 else '') if x else ''
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fun = lambda x, i: x[i + 1:8] + rec(x[8:], i - 1)
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while index + 1 < len(binary):
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chartype = binary[index:].index('0') # 存放字符所占字节数，一个字节的字符会存为0
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length = chartype * 8 if chartype else 8
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string.append(chr(int(fun(binary[index:index + length], chartype), 2)))
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index += length
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return ''.join(string)
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def decodeImage(image):
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"""
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解码隐藏数据
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"""
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pixels = list(image.getdata()) # 获取像素列表
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# 提取图片中所有最低有效位中的数据
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binary = ''.join([str(int(r >> 1 << 1 != r)) + str(int(g >> 1 << 1 != g)) + str(int(b >> 1 << 1 != b)) + str(
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int(t >> 1 << 1 != t)) for (r, g, b, t) in pixels])
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# 找到数据截止处的索引
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locationDoubleNull = binary.find('0000000000000000')
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endIndex = locationDoubleNull + (
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8 - (locationDoubleNull % 8)) if locationDoubleNull % 8 != 0 else locationDoubleNull
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data = binaryToString(binary[0:endIndex])
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return data
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# 调用函数对图片进行数据编码并保存
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#encodeDataInImage(Image.open("d:/9.png"), 'https://www.hzkjai.com 吉林绘智科技有限公司').save('d:/9.png')
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# 解码图片中隐藏的数据并打印
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#print(decodeImage(Image.open("d:/9.png")))
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