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Showing content from http://libvips.github.io/libvips/API/current/method.Image.mosaic.html below:

Vips.Image.mosaic

int
vips_mosaic (
  VipsImage* ref,
  VipsImage* sec,
  VipsImage** out,
  VipsDirection direction,
  int xref,
  int yref,
  int xsec,
  int ysec,
  ...
)

This operation joins two images left-right (with ref on the left) or top-bottom (with ref above) given an approximate overlap.

sec is positioned so that the pixel (xsec, ysec) in sec lies on top of the pixel (xref, yref) in ref. The overlap area is divided into three sections, 20 high-contrast points in band bandno of image ref are found in each, and a window of pixels of size hwindow around each high-contrast point is searched for in sec over an area of harea.

A linear model is fitted to the 60 tie-points, points a long way from the fit are discarded, and the model refitted until either too few points remain or the model reaches good agreement.

The detected displacement is used with vips_merge() to join the two images together.

You can read out the detected transform with dx0, dy0, scale1, angle1, dx1, dy1.

Optional arguments

• bandno: gint, band to search for features
• hwindow: gint, half window size
• harea: gint, half search size
• mblend: gint, maximum blend size
• dx0: gint, output, detected displacement
• dy0: gint, output, detected displacement
• scale1: gdouble, output, detected first order scale
• angle1: gdouble, output, detected first order rotation
• dx1: gdouble, output, detected first order displacement
• dy1: gdouble, output, detected first order displacement

This method is not directly available to language bindings.

sec

Type: VipsImage

Secondary image.

The data is owned by the caller of the method.

out

Type: VipsImage

Output image.

The argument will be set by the function. The caller of the method takes ownership of the returned data, and is responsible for freeing it.

direction

Type: VipsDirection

Horizontal or vertical join.

xref

Type: int

Position in reference image.

yref

Type: int

Position in reference image.

xsec

Type: int

Position in secondary image.

ysec

Type: int

Position in secondary image.

...

Type: 

NULL-terminated list of optional named arguments.

Type: int

0 on success, -1 on error.

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