opencv——python(1)

1. 导入OpenCV模块

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import cv2

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2.导入numpy模块

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import numpy as np

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3.读取当前目录图片

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img = cv2.imread("1.jpg")

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4.创建图像

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emptyImage = np.zeros(img.shape, np.uint8)

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5.复制图像

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emptyImage2 = img.copy()

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6.得到图像副本，并做灰度处理

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emptyImage3 = cv2.cvtColor(img, cv2.COLOR_BGR2GRAY)

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7.显示图像

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cv2.imshow("EmptyImage", emptyImage)
cv2.imshow("EmptyImage1", img)
cv2.imshow("EmptyImage2", emptyImage2)
cv2.imshow("EmptyImage3", emptyImage3)

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8.写入保存图片

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cv2.imwrite("./cat2.jpg", img, [int(cv2.IMWRITE_JPEG_QUALITY), 5])
cv2.imwrite("./cat3.jpg", img, [int(cv2.IMWRITE_JPEG_QUALITY), 100])
cv2.imwrite("./cat.png", img, [int(cv2.IMWRITE_PNG_COMPRESSioN), 0])
cv2.imwrite("./cat2.png", img, [int(cv2.IMWRITE_PNG_COMPRESSION), 9])

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9.窗口等待

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cv2.waiTKEy(0)
cv2.destroyAllwindows()

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