Aligns two ndarrays up to a translation such that the sum of squared differences between them is minimized. This can be used as a quick preprocess for other more detailed alignment algorithms.
Here is a simple example showing how to use this code to image alignment. First, let's start out with an image:
var baboon = require("luminance")(require("baboon-image"))
Next, let's cut out a patch:
var patch = baboon.lo(222, 215).hi(80, 80)
Which looks like this:
Finally, we can use phase-align
to find the patch in the original image like this:
var position = require("phase-align")(patch, baboon)
console.log(position)
The above prints out the coordinates of the upper left corner of the patch in the original:
[ 222, 215 ]
Install using npm:
npm install phase-align
Finds the pixel coordinates of the occurence of patch
within the larger image
patch
is an ndarray to matchimage
is the image to match withinoptions
is an object containing some optional parametersnormalize
Defaulttrue
. If set, images are normalized for intensity before matching (except for images whose size is one).
Returns An array of coordinates representing the occurence of patch
within image
(c) 2013 Mikola Lysenko. MIT License