Examples with NotEnoughDataPointsException mpicbg.models.NotEnoughDataPointsException used on opensource projects

Example 16 with NotEnoughDataPointsException

use of mpicbg.models.NotEnoughDataPointsException in project TrakEM2 by trakem2.

the class Render method sampleAverageScale.

/**
 * Sample the average scaling of a given {@link CoordinateTransform} by transferring
 * a set of point samples using the {@link CoordinateTransform} and then
 * least-squares fitting a {@link SimilarityModel2D} to it.
 *
 * @param ct
 * @param width of the samples set
 * @param height of the samples set
 * @param dx spacing between samples
 *
 * @return average scale factor
 */
protected static final double sampleAverageScale(final CoordinateTransform ct, final int width, final int height, final double dx) {
    final ArrayList<PointMatch> samples = new ArrayList<PointMatch>();
    for (double y = 0; y < height; y += dx) {
        for (double x = 0; x < width; x += dx) {
            final Point p = new Point(new double[] { x, y });
            p.apply(ct);
            samples.add(new PointMatch(p, p));
        }
    }
    final SimilarityModel2D model = new SimilarityModel2D();
    try {
        model.fit(samples);
    } catch (final NotEnoughDataPointsException e) {
        e.printStackTrace(System.err);
        return 1;
    }
    final double[] data = new double[6];
    model.toArray(data);
    return Math.sqrt(data[0] * data[0] + data[1] * data[1]);
}