Build image mosaics [src]
Build image mosaics
These functions are useful for joining many small images together to make one large image. They can cope with unstable contrast and arbitrary sub-image layout, but will not do any geometric correction. Geometric errors should be removed before using these functions.
The mosaicing functions can be grouped into layers:
The lowest level operation is vips_merge() which joins two images
together left-right or up-down with a smooth seam.
Next, vips_mosaic() uses search functions plus the two low-level merge
operations to join two images given just an approximate overlap as a start point.
vips_mosaic1() is a first-order analogue of the basic mosaic
functions: it takes two approximate tie-points and uses them to rotate and
scale the right-hand or bottom image before starting to join.
Finally, vips_globalbalance() can be used to remove contrast
differences in a mosaic which has been assembled with these functions. It
takes the mosaic apart, measures image contrast differences along the seams,
finds a set of correction factors which will minimise these differences, and
reassembles the mosaic. vips_remosaic() uses the same techniques, but
will reassemble the image from a different set of source images.