NAME

overlap -- Overlaps two images in X or Y, by a certain amount of columns or lines.

USAGE

overlap input1 input2 output dx dy

DESCRIPTION

This task creates a composite 2-D output image from two input 2-D images. The composite is the result of overlapping the two input images by a certain amount of lines or columns. The amount is specified by task parameters dx and dy. If dx>0 and, dy=0, the input images are overlapped columnwise: last dx columns of input1 are overlapped with first dx columns of input2. The input images must have the same number of lines. If dx=0 and dy>0, the images are overlapped linewise, and they must have the same number of columns.

The overlapped region is built as a weighted average of the relevant regions in the input images, and the weight function is specified by task parameter weight. It can be either a linear or a cos tapering function.

PARAMETERS

input[file name]

First input 2-d image section.

input[file name]

Second input 2-d image section.

output [file name]

Output image. Always type real, regardless of input image type.

dx = [integer, min=0]

Amount of overlap in X direction (pixels).

dy = [integer, min=0]

Amount of overlap in Y direction (pixels).

(weight = "cos") [string, Allowed values: cos | linear]

Type of weighting function used in overlapped region.

EXAMPLES

1. Overlap in X images image1 and image2 by 100 pixels, using linear weighting:

  pl> overlap image1.hhh image2.hhh output.hhh dx=100 dy=0 weight="linear"

BUGS

SEE ALSO