Crop image

[lars-reimann]

Is your feature request related to a problem?

Cropping is a common transformation on images.

Desired solution

• Add a new method crop to Image that takes four parameters
  • x - the x coordinate of the top-left corner of the bounding rectangle
  • y - the y coordinate of the top-left corner of the bounding rectangle
  • width - the width of the bounding rectangle
  • height - the height of the bounding rectangle
• The method should return the cropped image but leave the original unchanged

As usual in image processing, the origin of the coordinate system should be the top-left corner of the image. The x-axis should increase to the right and the y-axis should go down.

Raise an error, if the bounding rectangle is not contained in the image.

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