OpenCV Python将图像围绕特定点旋转X度 [英] OpenCV Python rotate image by X degrees around specific point

问题描述

我很难找到使用OpenCV在Python中将图像围绕特定点旋转特定角度(通常很小)的示例.

I'm having a hard time finding examples for rotating an image around a specific point by a specific (often very small) angle in Python using OpenCV.

这是我到目前为止所拥有的，但是它会产生非常奇怪的结果图像，但是会有些旋转:

This is what I have so far, but it produces a very strange resulting image, but it is rotated somewhat:

def rotateImage( image, angle ):
    if image != None:
        dst_image = cv.CloneImage( image )

        rotate_around = (0,0)
        transl = cv.CreateMat(2, 3, cv.CV_32FC1 )

        matrix = cv.GetRotationMatrix2D( rotate_around, angle, 1.0, transl )
        cv.GetQuadrangleSubPix( image, dst_image, transl )
        cv.GetRectSubPix( dst_image, image, rotate_around )

    return dst_image

推荐答案

import numpy as np

def rotate_image(image, angle):
  image_center = tuple(np.array(image.shape[1::-1]) / 2)
  rot_mat = cv2.getRotationMatrix2D(image_center, angle, 1.0)
  result = cv2.warpAffine(image, rot_mat, image.shape[1::-1], flags=cv2.INTER_LINEAR)
  return result

假设您使用的是cv2版本，该代码将找到您要旋转的图像的中心，计算变换矩阵并将其应用于图像.

Assuming you're using the cv2 version, that code finds the center of the image you want to rotate, calculates the transformation matrix and applies to the image.

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