Examples with DescribePointSift boofcv.alg.feature.describe.DescribePointSift used on opensource projects

Example 1 with DescribePointSift

use of boofcv.alg.feature.describe.DescribePointSift in project BoofCV by lessthanoptimal.

the class FactoryDetectDescribe method sift.

/**
 * Creates a new SIFT feature detector and describer.
 *
 * @see CompleteSift
 *
 * @param config Configuration for the SIFT detector and descriptor.
 * @return SIFT
 */
public static <T extends ImageGray<T>> DetectDescribePoint<T, BrightFeature> sift(@Nullable ConfigCompleteSift config) {
    if (config == null)
        config = new ConfigCompleteSift();
    ConfigSiftScaleSpace configSS = config.scaleSpace;
    ConfigSiftDetector configDetector = config.detector;
    ConfigSiftOrientation configOri = config.orientation;
    ConfigSiftDescribe configDesc = config.describe;
    SiftScaleSpace scaleSpace = new SiftScaleSpace(configSS.firstOctave, configSS.lastOctave, configSS.numScales, configSS.sigma0);
    OrientationHistogramSift<GrayF32> orientation = new OrientationHistogramSift<>(configOri.histogramSize, configOri.sigmaEnlarge, GrayF32.class);
    DescribePointSift<GrayF32> describe = new DescribePointSift<>(configDesc.widthSubregion, configDesc.widthGrid, configDesc.numHistogramBins, configDesc.sigmaToPixels, configDesc.weightingSigmaFraction, configDesc.maxDescriptorElementValue, GrayF32.class);
    NonMaxSuppression nns = FactoryFeatureExtractor.nonmax(configDetector.extract);
    NonMaxLimiter nonMax = new NonMaxLimiter(nns, configDetector.maxFeaturesPerScale);
    CompleteSift dds = new CompleteSift(scaleSpace, configDetector.edgeR, nonMax, orientation, describe);
    return new DetectDescribe_CompleteSift<>(dds);
}

Example 2 with DescribePointSift

use of boofcv.alg.feature.describe.DescribePointSift in project BoofCV by lessthanoptimal.

the class TestDescribeDenseSiftAlg method computeDescriptor.

/**
 * Compute to the general descriptor algorithm.  They should produce the same results
 */
@Test
public void computeDescriptor() {
    GrayF32 derivX = new GrayF32(100, 102);
    GrayF32 derivY = new GrayF32(100, 102);
    GImageMiscOps.fillUniform(derivX, rand, 0, 200);
    GImageMiscOps.fillUniform(derivY, rand, 0, 200);
    DescribeDenseSiftAlg<GrayF32> alg = new DescribeDenseSiftAlg<>(4, 4, 8, 0.5, 0.2, 10, 10, GrayF32.class);
    DescribePointSift<GrayF32> algTest = new DescribePointSift<>(4, 4, 8, 1, 0.5, 0.2, GrayF32.class);
    alg.setImageGradient(derivX, derivY);
    algTest.setImageGradient(derivX, derivY);
    List<Point2D_I32> samplePoints = new ArrayList<>();
    samplePoints.add(new Point2D_I32(30, 35));
    samplePoints.add(new Point2D_I32(45, 10));
    samplePoints.add(new Point2D_I32(60, 12));
    samplePoints.add(new Point2D_I32(50, 50));
    TupleDesc_F64 found = new TupleDesc_F64(128);
    TupleDesc_F64 expected = new TupleDesc_F64(128);
    for (Point2D_I32 p : samplePoints) {
        alg.computeDescriptor(p.x, p.y, found);
        algTest.process(p.x, p.y, 1, 0, expected);
        for (int i = 0; i < 128; i++) {
            assertEquals(expected.value[i], found.value[i], 1e-8);
        }
    }
}

Example 3 with DescribePointSift

use of boofcv.alg.feature.describe.DescribePointSift in project BoofCV by lessthanoptimal.

the class TestCompleteSift method createAlg.

private CompleteSift createAlg() {
    SiftScaleSpace ss = new SiftScaleSpace(-1, 4, 3, 1.6);
    NonMaxSuppression nonmax = FactoryFeatureExtractor.nonmax(new ConfigExtract(1, 0, 1, true, true, true));
    NonMaxLimiter limiter = new NonMaxLimiter(nonmax, 300);
    OrientationHistogramSift<GrayF32> ori = new OrientationHistogramSift<>(36, 1.5, GrayF32.class);
    DescribePointSift<GrayF32> describe = new DescribePointSift<>(4, 4, 8, 1.5, 0.5, 0.2, GrayF32.class);
    return new CompleteSift(ss, 10, limiter, ori, describe);
}