Module imagingbook.common

Package imagingbook.common.corners

Class ShiTomasiCornerDetector

java.lang.Object

imagingbook.common.corners.GradientCornerDetector

imagingbook.common.corners.ShiTomasiCornerDetector

public class ShiTomasiCornerDetector
extends GradientCornerDetector

This is an implementation of the Shi-Tomasi corner detector, as described in [1]. This class extends GradientCornerDetector (where most of the work is done) by defining a specific corner score function and associated threshold. See Sec. 6.3.1 of [2] for additional details.

[1] J. Shi and C. Tomasi. Good features to track. In Proceedings of IEEE Conference on Computer Vision and Pattern Recognition, CVPR’94, pp. 593–600, Seattle, WA, USA (1994).
[2] W. Burger, M.J. Burge, Digital Image Processing – An Algorithmic Introduction, 3rd ed, Springer (2022).

Version:

2022/03/30

Nested Class Summary

Nested classes/interfaces inherited from class imagingbook.common.corners.GradientCornerDetector

GradientCornerDetector.Parameters

Field Summary

Fields inherited from class imagingbook.common.corners.GradientCornerDetector

M, N, params, Q, RETAIN_TEMPORARY_DATA, UndefinedScoreValue

Constructor Summary

Constructors

Constructor	Description
ShiTomasiCornerDetector(ImageProcessor ip, GradientCornerDetector.Parameters params)

Method Summary

Modifier and Type	Method	Description
protected float	getCornerScore(float A, float B, float C)	Calculates the corner response score for a single image position (u,v) from the elements A, B, C of the local structure matrix.

Methods inherited from class imagingbook.common.corners.GradientCornerDetector

getA, getB, getC, getCorners, getQ

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Details

ShiTomasiCornerDetector

public ShiTomasiCornerDetector(ImageProcessor ip,
 GradientCornerDetector.Parameters params)

Method Details

getCornerScore

protected float getCornerScore(float A,
 float B,
 float C)

Description copied from class: GradientCornerDetector

Calculates the corner response score for a single image position (u,v) from the elements A, B, C of the local structure matrix. The method should normalize the score value, such that 100 is returned for the default threshold value. To be implemented by concrete sub-classes.

Specified by:

getCornerScore in class GradientCornerDetector

Parameters:

A - = Ixx(u,v)

B - = Iyy(u,v)

C - = Ixy(u,v)

Returns:

the corner score

See Also:

• HarrisCornerDetector
• ShiTomasiCornerDetector