python图像平移,Python 图像扩充之旋转、平移、缩放、裁剪

Python 图像扩充之旋转、平移、缩放、裁剪

Python 图像扩充之旋转、平移、缩放、裁剪

旋转

def rotate_img(img, degrees):

'''

旋转图片

:param img: 原始图片

:param degrees: 旋转角度

:return:

'''

height, width = img.shape[:2]

# 旋转后的尺寸

heightNew = int(width * fabs(sin(radians(degrees))) + height * fabs(cos(radians(degrees))))

widthNew = int(height * fabs(sin(radians(degrees))) + width * fabs(cos(radians(degrees))))

# 这里的第一个参数为旋转中心，第二个为旋转角度，第三个为旋转后的缩放因子

# 可以通过设置旋转中心，缩放因子，以及窗口大小来防止旋转后超出边界的问题

matRotation = cv2.getRotationMatrix2D((width / 2, height / 2), degrees, 1)

matRotation[0, 2] += (widthNew - width) / 2

matRotation[1, 2] += (heightNew - height) / 2

resultImg = cv2.warpAffine(img, matRotation, (widthNew, heightNew), borderValue=(255, 255,