51 lines
1.2 KiB
Python
51 lines
1.2 KiB
Python
# -*- coding: utf-8 -*-
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# @Time : 2022-7-26 0026 11:41
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# @Author : Qing
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# @Email : derighoid@gmail.com
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# @File : GammaCorrection.py
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# @Software: PyCharm
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'''
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gamma矫正公式:
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f(x)=x^γ
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即输出是输入的幂函数,指数为γ.
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'''
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import matplotlib.pyplot as plt
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import numpy as np
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from PIL import Image
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# 文件保存的地址及文件夹
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root = "E:\\桌面\\Python_Picture_Analysis\\data\\"
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# 定义伽马矫正函数
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def gammaCorrect(filePath, val):
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'''
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:param filePath: 图片路径
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:param val: 伽马值
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:return: 图片
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'''
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# 获取图片
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im = Image.open(filePath)
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img = np.array(im) # 图片转矩阵
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# 伽马函数使用
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img1 = np.power(img / float(np.max(img)), 1 / 1.5) # gamma值为1/1.5
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img2 = np.power(img / float(np.max(img)), val) # 自定义gamma值
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# 多图合并
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plt.subplot(131)
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plt.imshow(img)
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plt.title("origin") # 展示原图
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plt.subplot(132)
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plt.imshow(img1)
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plt.title("gammar=1/1.5") # 展示gamma =1/1.5
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plt.subplot(133)
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plt.imshow(img2)
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plt.title("user-defined") # 展示自定义 gammat Image
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plt.show()
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# 图片保存
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Image.fromarray(np.uint8(img2)).save(root + 'picture10' + '.jpg')
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return img2
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