Matplotlib笔记4----------图像处理

HuashuiMu花水木2025-07-06 8:06

1.读取图片

imread()
图片由三原色红绿蓝(RGB)组成,每个颜色像素点RGB三色的值范围为0～255
彩色图为三维数据，黑白图为二维数据

python 复制代码

import numpy as np
import pandas as pd
import matplotlib.pyplot as plt
img = plt.imread('pic.jpg')
print(img.shape)
#运行结果为：(3000, 4000, 3)

2.显示图像

imshow()

python 复制代码

import numpy as np
import pandas as pd
import matplotlib.pyplot as plt
img = plt.imread('pic.jpg')
plt.imshow(img)

3.垂直翻转

python 复制代码

import numpy as np
import pandas as pd
import matplotlib.pyplot as plt
img = plt.imread('pic.jpg')
plt.imshow(img,origin='lower')

4.水平翻转

python 复制代码

import numpy as np
import pandas as pd
import matplotlib.pyplot as plt
img = plt.imread('pic.jpg')
plt.imshow(img[:,::-1])

5.图片截取

python 复制代码

import numpy as np
import pandas as pd
import matplotlib.pyplot as plt
img = plt.imread('pic.jpg')
plt.imshow(img[:1000,:2000])

6.保存图片

imsave

python 复制代码

import numpy as np
import pandas as pd
import matplotlib.pyplot as plt
img = plt.imread('pic.jpg')
img2 = img[:1000,:2000]
plt.imsave('pic2.png',img2)

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