Generate grid🔗
Generates a set points that uniformly covers the pixel grid of an image. With an iteration this tool can be used to apply an operation to sub-images.
To split an input image into fixed-size pieces, iterated grid
corners can be used as an input to :doc:pixel-to-world coordinate
transform <PixelCoordinatesToWorldTool> followed by
cropping. To apply an operation to sub-images
without cropping one can connect the iterated grid corners as the
frame input for many tools such as histogram.
Inputs🔗
image: The image to cover with a grid.gridSpacing: The horizontal and vertical spacing between points in pixel coordinates.gridPosition: Specifies how the grid should be positioned.
Outputs🔗
corners: The coordinates of the upper left corners of each grid cell in pixel coordinates in row-major order. A N-by-2 matrix. Note that due to perspective and non-linear lens distortions the points may not be uniformly spaced in world coordinates.gridSize: A 1-by-2 integer matrix that contains the number of cells in the grid (width, height).
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enum
GridPosition🔗 Different ways of positioning the grid.
Values:
-
enumerator
FitInImage🔗 Make sure each cell fits in the image completely.
If the size of the image is not a multiple of gridSpacing, leave equal top/bottom and left/right margins. If the input image is smaller than gridSpacing, this technique produces an empty set of points.
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enumerator
CoverWholeImage🔗 Make sure every pixel in the image is in one of the cells.
If the size of the image is not a multiple of gridSpacing, the top/bottom and left/right cells exceed image boundaries by an equal amount.
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enumerator