# US 2014/0192221 A1 · Method and system for detecting and capturing focused image

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- Number: US 2014/0192221 A1
- Document ID: US20140192221A1
- Status: Published application
- Kind: A1
- Application number: 14/240,159
- Filed: 2012-08-23
- Published: 2014-07-10
- Earliest claimed: 2011-09-05
- Assignees: Forus Health Pvt. Ltd.
- Inventors: Shyam Vasudeva Rao; K. Chandrasekhar; Bharath Hegde; Srinidhi Srinath; Chetan M. Chatra
- Web page: https://patentgrep.com/patent/US20140192221A1

## CPC

- H04N 23/673: {based on contrast or high frequency components of image signals, e.g. hill climbing method}
- G03B 13/36: Autofocus systems
- H04N 5/142: {Edging; Contouring}
- H04N 5/2622: {Signal amplitude transition in the zone between image portions, e.g. soft edges}
- H04N 5/76: Television signal recording
- H04N 9/3191: {Testing thereof (testing of displays in general G09G3/006)}
- H04N: PICTORIAL COMMUNICATION, e.g. TELEVISION
- G03B: APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR (optical parts of such apparatus G02B; photosensitive materials or processes for photographic purposes G03C; apparatus for processing exposed photographic materials G03D)

## Abstract

The embodiments herein provide a system and method for detecting and capturing a focused image. The system comprises of an image capturing unit, edge detection unit and a focusing unit. The image capturing unit obtains plurality of images sequentially. The edge detection unit identifies region of interest in each of the obtained images and calculates edge strength value for the identified regions. The edge detection unit determines peak edge value from the edge strength values. The edge strength value quantifies degree of focus in the identified region. If the identified region is more focused, the number of edges is relatively more when compared with out-of-focus region. The peak edge value indicates that the identified region is well focused. The focusing unit causes the image capturing unit to capture focused image when the edge strength value reaches a predefined value of the peak edge value.

## Claims

### Claim 1

A method for detecting and capturing focused image, said method comprising acts of:
obtaining plurality of images of a subject sequentially by changing focus and identifying a region of interest in each of the obtained images;
calculating edge strength value for each of the identified regions;
determining change in the edge strength value of the identified regions in consecutive images;
determining a peak edge value from the edge strength values of the identified regions;
upon determining the peak edge value, obtaining plurality of the images and identifying the region of interest till the edge strength value of one of the identified region reach a predefined threshold value;
changing the focus and obtaining plurality of the images; and
capturing an image when the edge strength value of the identified region in one of the obtained images reach a predefined value of the peak edge value.

### Claim 2 (depends on 1)

The method as claimed in claim 1, wherein the focus is changed from a minimum focus point 0 towards a maximum focus point 100.

### Claim 3 (depends on 1)

The method as claimed in claim 1, wherein the peak edge value is determined when the change in the edge strength value becomes negative.

### Claim 4 (depends on 1)

The method as claimed in claim 1, wherein the images with identified regions having edge strength value less than configured threshold value are eliminated.

### Claim 5 (depends on 1)

The method as claimed in claim 1, wherein the edge strength value is average edge strength value of two or more identified regions.

### Claim 6 (depends on 1)

The method as claimed in claim 1, wherein the predefined value is 90% value of the peak edge value.

### Claim 7

A system for detecting and capturing a focused image, comprising:
an image capturing unit configured to obtain plurality of sequence of images by changing focus;
an edge detection unit configured to identify region of interest in each of the obtained images and to calculate edge strength values for each of the identified regions;
the edge detection unit detects a peak edge value from the edge strength values of the identified regions;
a focusing unit configured to cause the image capturing unit to capture the focused image when the edge strength value of one of the identified region reaches a predefined value of the peak edge value.

### Claim 8 (depends on 7)

The system as claimed in claim 7, wherein the edge detection unit detects the peak edge value when change in the edge strength value of the consecutive identified regions becomes negative.