Preparation

This module provides functions to prepare an image or points for stitching.

class Rectificator(config)

Bases: object

Class to rectify images and points.

Remove lens distortion from images and points.

rectify_image(image)

Remove lens distortion from an image.

Parameters:image (ndarray) – Input (distorted) image. Returns:Output (corrected) image with same size and type as image. Return type:ndarray

rectify_points(points, size)

Remove lens distortion from points.

Map points determined from distorted image to its position in an undistorted image.

Parameters:

• points (ndarray) – List of (distorted) points (N,2).
• size (tuple) – Size (width, height) of the image, which was used to determine the points.

Returns:

List of corrected points.

Return type:

ndarray

rectify_points_angles(points, angles, size)

Remove lens distortion from angles.

Map angles determined from distorted image to its angles in an undistorted image.

Parameters:

• points (ndarray) – List of (distorted) points (N,2).
• angles (ndarray) – List of Angles in rad (length (N,)).
• size (tuple) – Size (width, height) of the image, which was used to determine the points.

Returns:

• rect_points (ndarray) – List of corrected points
• rect_angles (ndarray) – List of corrected angles

rotate_image(image, angle)

Rotate image by given angle.

Parameters:

• image (ndarray) – Input image.
• angle (int) – Rotation angle in degree. Positive value means counter-clockwise rotation.

Returns:

• rot_image (ndarray) – Rotated image.
• affine_mat (ndarray) – An affine (3,3)–matrix for rotation of image or points.

rotate_points(points, angle, size)

Rotate points by given angle and in relation to the size of an image.

Parameters:

• points (ndarray) – List of points (N, 2).
• angle (int) – Rotation angle in degree. Positive values mean counter-clockwise rotation.
• size (tuple) – Size (width, height) of the image, which was used to determine the points.

Returns:

Rotated points (N, 2).

Return type:

ndarray