US 8,942,485 B2Granted

Electronic device and method for recognizing features of objects

AssigneesHONG FU JIN PRECISION INDUSTRY (ShenZhen) CO., LTD., Hon Hai Precision Industry Co., Ltd.

InventorGuang-Jian Wang

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Abstract

An electronic device stores haar-like features and geometrical features of an object. A reference image of the object is created according to the geometrical features of the object. An outline image is obtained from each image of the object. The electronic device calculates derivatives of each two adjacent points on the reference image and each outline image. A derivative matrix of the reference image and a derivative matrix of each outline image are generated. The electronic device generates a first derivative curve corresponding to the derivative matrix of the reference image and a second derivative curve corresponding to each derivative matrix of the outline image. When all the second derivative curves are the same as the first derivative curve, the electronic device determines whether each outline image is corresponding to the object by using the haar-like features of the object.

Claims12

Dependent claims

An electronic device, comprising:

a processor;
and
a non-transitory computer-readable medium that stores one or more programs, which comprise instructions which when executed by the processor of the electronic device, performs operations of:
(a) create a reference image of an object according to geometrical features of the object;
(b) obtain an outline image from each image of the object;
(c) search for feature points of the object from the reference image and each outline image;
(d) obtain each two adjacent points on the reference image and each outline image according to the feature points of the object, calculate derivatives of each two adjacent points on the reference image and each outline image according to coordinates of each two adjacent points, and generate a derivative matrix of the reference image according to the derivatives of each two adjacent points of the reference image and generate a derivative matrix of each outline image according to the derivatives of each two adjacent points of the outline of each outline image;
(e) generate a first derivative curve corresponding to the derivative matrix of the reference image and a second derivative curve corresponding to each derivative matrix of the outline image;
and
(f) determine whether each outline image is corresponding to the object by using a haar-like features of the object when all the second derivative curves are the same as the first derivative curve.

7 more elements

A method being executed by a processor of an electronic device, comprising steps:

(a) creating a reference image of an object according to geometrical features of the object;
(b) obtaining an outline image of each image of the object;
(c) searching for feature points of the object from the reference image and each outline image;
(d) obtaining each two adjacent points on the reference image and each outline image according to the feature points of the object, calculating derivatives of each two adjacent points on the reference image and each outline image according to coordinates of each two adjacent points, and generating a derivative matrix of the reference image according to the derivatives of each two adjacent points of the reference image and generating a derivative matrix of each outline image according to the derivatives of each two adjacent points of the outline of each outline image;
(e) generating a first derivative curve corresponding to the derivative matrix of the reference image and a second derivative curve corresponding to each derivative matrix of the outline image;
and
(f) determining whether each outline image is corresponding to the object by using a haar-like features of the object when all the second derivative curves are the same as the first derivative curve.

4 more elements

A non-transitory computer-readable medium having stored thereon instructions that, when executed by a processor of an electronic device, cause the processor to perform operations of:

(a) creating a reference image of an object according to geometrical features of the object;
(b) obtaining an outline image from each image of the object;
(c) searching for feature points of the object from the reference image and each outline image;
(d) obtaining each two adjacent points on the reference image and each outline image according to the feature points of the object, calculating derivatives of each two adjacent points on the reference image and each outline image according to coordinates of each two adjacent points, and generating a derivative matrix of the reference image according to the derivatives of each two adjacent points of the reference image and generating a derivative matrix of each outline image according to the derivatives of each two adjacent points of the outline of each outline image;
(e) generating a first derivative curve corresponding to the derivative matrix of the reference image and a second derivative curve corresponding to each derivative matrix of the outline image;
and
(f) determining whether each outline image is corresponding to the object by using a haar-like features of the object when all the second derivative curves are the same as the first derivative curve.

4 more elements

Dependencies are inferred from the claim text.

Facts

Application: 14/014,476Filed 30 Aug 2013
Priority: CN 2012 1 03786659 Oct 2012
Published: US 2014/0099032 A110 Apr 2014
Granted: 27 Jan 2015
Term ends: Not estimatedThe source records don’t support an estimate.

Classification3 codes

G06V 10/446
By matching or filtering: using Haar-like filters, e.g. using integral image techniques
G06V 10/46
Extraction of image or video features: descriptors for shape, contour or point-related descriptors, e.g. scale invariant feature transform [SIFT]…
G06V
Image and video recognition