class AffineTransform: def __init__(self, matrix)
Define an affine image transform.
class ExtentTransform: def __init__(self, bbox)
Define a transform to extract a subregion from an image.
class MeshTransform: def __init__(self, data)
Define an mesh image transform.
class QuadTransform: def __init__(self, xy)
Define an quad image transform.
AffineTransform(matrix)
Define an affine image transform.
This function takes a 6-tuple (a, b, c, d, e, f) which contain the first two rows from an affine transform matrix. For each pixel (x, y) in the output image, the new value is taken from a position (a x + b y + c, d x + e y + f) in the input image, rounded to nearest pixel.
This function can be used to scale, translate, rotate, and shear the original image.
matrix
-- A 6-tuple (a, b, c, d, e, f) containing
the first two rows from an affine transform matrix.
ExtentTransform(bbox)
Define a transform to extract a subregion from an image.
Maps a rectangle (defined by two corners) from the image to a rectangle of the given size. The resulting image will contain data sampled from between the corners, such that (x0, y0) in the input image will end up at (0,0) in the output image, and (x1, y1) at size.
This method can be used to crop, stretch, shrink, or mirror an arbitrary rectangle in the current image. It is slightly slower than crop, but about as fast as a corresponding resize operation.
bbox
-- A 4-tuple (x0, y0, x1, y1) which specifies
two points in the input image's coordinate system.
MeshTransform(data)
Define an mesh image transform. A mesh transform consists of one or more individual quad transforms.
data
-- A list of (bbox, quad) tuples.
QuadTransform(xy)
Define an quad image transform.
Maps a quadrilateral (a region defined by four corners) from the image to a rectangle of the given size.
xy
-- An 8-tuple (x0, y0, x1, y1, x2, y2, y3, y3) which
contain the upper left, lower left, lower right, and upper right
corner of the source quadrilateral.