【opencv-python】图像旋转、尺寸变换

た入场券 2022-04-23 20:30 285阅读 0赞

顺时针旋转

def Rotate90(img):
        trans_img = cv2.transpose(img)
        new_img = cv2.flip(trans_img, 1)
        return new_img

逆时针旋转

def Rotate_90(img):
        trans_img = cv2.transpose( img )
        new_img = cv2.flip( trans_img, 0 )
        return new_img

尺寸缩放

resize_img = cv2.resize(img,(int(img.shape[1]*.5),int(img.shape[0]*.5)))
    cv2.imshow('resize_img', resize_img)

综合程序代码

import cv2
    
    # 顺时针旋转90度
    def Rotate90(img):
        trans_img = cv2.transpose(img)
        new_img = cv2.flip(trans_img, 1)
        return new_img
    
    
    # 逆时针旋转90度
    def Rotate_90(img):
        trans_img = cv2.transpose( img )
        new_img = cv2.flip( trans_img, 0 )
        return new_img
    
    def test(img_path):
        img = cv2.imread(img_path)
        cv2.imshow('raw', img)
    
        clock90_img = Rotate_90(img)
        cv2.imshow( 'Rotate90', clock90_img )
    
        clock_90_img = Rotate90(img)
        cv2.imshow('Rotate_90', clock_90_img)
    
        resize_img = cv2.resize(img,(int(img.shape[1]*.5),int(img.shape[0]*.5)))
        cv2.imshow('resize_img', resize_img)
    
    
    
    if __name__ == '__main__':
        test('mi.jpg')
    
        cv2.waitKey(0)
        cv2.destroyAllWindows()

运行效果

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3BsU29uZ19DU0RO_size_16_color_FFFFFF_t_70][]![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3BsU29uZ19DU0RO_size_16_color_FFFFFF_t_70 1][]

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3BsU29uZ19DU0RO_size_16_color_FFFFFF_t_70 2][]![20190409202247637.png][]

[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3BsU29uZ19DU0RO_size_16_color_FFFFFF_t_70]: https://img-blog.csdnimg.cn/20190409202133322.png?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3BsU29uZ19DU0RO,size_16,color_FFFFFF,t_70
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3BsU29uZ19DU0RO_size_16_color_FFFFFF_t_70 1]: /images/20220222/b79e1bd485d4452b9d2d20699f8b723f.png
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3BsU29uZ19DU0RO_size_16_color_FFFFFF_t_70 2]: https://img-blog.csdnimg.cn/20190409202217950.png?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3BsU29uZ19DU0RO,size_16,color_FFFFFF,t_70
[20190409202247637.png]: /images/20220222/b0dc3392d97d43a191908cedbf5bd2d0.png