Finds patterns in ndarrays
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 lena = require"luminance"require"lena"
Next, let's cut out a patch:
var patch = lenalo222 215hi80 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 lenaconsole.logposition
Which prints out the coordinates of the upper left corner fo the patch in the original:
[ 222, 215 ]
npm install phase-align
Finds the pixel coordinates of the occurence of
patch within the larger
patchis an ndarray to match
imageis the image to match within
optionsis an object containing some optional parameters
true. If set, images are normalized for intensity before matching.
Returns An array of coordinates representing the occurence of
patch within image
(c) 2013 Mikola Lysenko. MIT License