python opencv

cv2下载链接：https://files.pythonhosted.org/packages/17/2f/d9cc975666db25dcc412b76f46510ece2bd921465a361336d441a8313dc6/opencv_python-3.4.3.18-cp36-cp36m-win_amd64.whl

#导入cv模块
import cv2 as cv2

#读取图像，支持 bmp、jpg、png、tiff 等常用格式
image = cv2.imread('./a.jpg')
#读取图像大小
size=image.shape
print('图像大小为',size)
print(size[0])
#创建窗口并显示图像,设定图像大小
res=cv2.resize(image,(1000,2000),interpolation=cv2.INTER_CUBIC)
#显示图像
cv2.imshow('iker',res)
#保存图像
cv2.imwrite("./cat3.jpg", res, [int(cv2.IMWRITE_JPEG_QUALITY), 100])

cv2.waitKey(0)
#释放窗口
cv2.destroyAllWindows()

#导入cv模块
import cv2 as cv2
#读取图像，支持 bmp、jpg、png、tiff 等常用格式

def size(jpg,now_size):
    image = cv2.imread(jpg)
    # 读取图像大小
    size = image.shape
    print('图像大小为', size)
    # 创建窗口并显示图像,设定图像大小

    if size[0]>now_size:
        beishu=size[0]/now_size
        res=cv2.resize(image,(now_size,int(size[1]/beishu)),interpolation=cv2.INTER_CUBIC)
        #显示图像
        # cv2.imshow('iker',res)
        #保存图像
        cv2.imwrite("./cat3.jpg", res, [int(cv2.IMWRITE_JPEG_QUALITY), 100])
        # cv2.waitKey(0)
        #释放窗口
        # cv2.destroyAllWindows()
    else:
        print('图像不用缩小')


def main():
    now_size = 500
    jpg=r'./a.jpg'
    size(jpg, now_size)

if __name__ == '__main__':
    main()