Method and system for data detecting of an instrument

Patent metadata

Field	Value
Publication number	US-2016358322-A1
Application number	US-201514894336-A
Country	US
Kind code	A1
Filing date	Aug 22, 2015
Priority date	Dec 26, 2014
Publication date	Dec 8, 2016
Grant date	—

Abstract

The present application provides a method and a system for detecting data of an instrument. The method comprises controlling rotation of the current data image in a first direction and acquiring current projection values of a pointer of the instrument in a vertical direction from the current data image after acquiring a current data image from an instrument to be read; then, selecting a maximum projection value from the acquired projection values and determining a corresponding position of the pointer of the instrument as a position to be calculated; calculating a first rotation angle required by rotation of the pointer of the instrument to the position to be calculated; substituting the first rotation angle into a pre-stored first calculation formula and calculating a first angle between the pointer of the instrument and the position to be calculated; then, substituting the first angle into a formula of correspondence between a pre-stored angle between the pointer of the instrument and the position to be calculated and instrument graduations to calculate current instrument data of the instrument to be read, thus ensuring the accuracy of the resulting data under various conditions.

First claim

What is claimed is:

1 . A method for detecting data of an instrument, characterized in that said method comprises:
acquiring a current data image from an instrument to be read;
controlling rotation of the current data image in a first direction and acquiring current projection values of a pointer of the instrument in a vertical direction from the current data image;
selecting a maximum projection value from all of acquired current projection values and determining a position where the pointer of the instrument has the maximum projection value in the vertical direction as a position to be calculated;
calculating a first rotation angle required by rotation of the pointer of the instrument to the position to be calculated in the first direction;
substituting the first rotation angle into a pre-stored first calculation formula and calculating a first angle between the pointer of the instrument and the position to be calculated; and
calculating current instrument data of the instrument to be read using correspondence between a pre-stored angle between the pointer of the instrument and the position to be calculated and instrument graduations.

2 . The method as recited in claim 1 , characterized in that the controlling rotation of the current data image in a first direction is particularly:
controlling rotation of the current data image in a clockwise or counterclockwise direction.

3 . The method as recited in claim 2 , characterized in that the position to be calculated is a horizontal position.

4 . The method as recited in claim 3 , characterized in that the first calculation formula is:

θ
I

=

{

θ
A

,

H
A

<

w
2

θ
A

+
180

,

H
A

>

w
2

;

wherein w represents width of the current data image, θ I represents an angle between the pointer of the instrument and a horizontal direction, and θ A represents the first rotation angle.

5 . The method as recited in claim 4 , characterized in that the correspondence between a pre-stored angle between the pointer of the instrument and the position to be calculated and instrument graduations I(θ I ) is detailed as:

I


(

θ
I

)

=

I
max

-

I
min

θ
max

-

θ
min



θ
I

+

I
min



θ
max

-

I
max



θ
min

θ
max

-

θ
min

;

wherein I max represents a maximum graduation of the instrument to be read, θ max represents an angle of the pointer of the instrument at a position corresponding to the maximum graduation of the instrument to be read, I min represents a minimum graduation of the instrument to be read, and θ min represents an angle of the pointer of the instrument at a position corresponding to the minimum graduation of the instrument to be read.

6 . The method as recited claim 1 , characterized in that said method further comprises:
establishing a two-dimensional coordinate system and aligning a center of the acquired current data image of the instrument to be read with an origin of the two-dimensional coordinate system, prior to the controlling rotation of the current data image in a first direction.

7 . A system for detecting data of an instrument, characterized in that said system comprises:
an acquisition means for acquiring a current data image from an instrument to be read;
a rotation control means for controlling rotation of the current data image in a first direction and acquiring current projection values of a pointer of the instrument in a vertical direction from the current data image;
a selection means for selecting a maximum projection value from all of acquired current projection values and determining a position where the pointer of the instrument has the maximum projection value in the vertical direction as a position to be calculated;
a first calculation means for calculating a first rotation angle required by rotation of the pointer of the instrument to the position to be calculated in the first direction;
a second calculation means for substituting the fi

Assignees

• State Grid Chongqing Electric Power Co Electric Power Res Inst
• State Grid Corp China
• The Smartech Inst

Inventors

• Song Wei
• Fu Jin
• Wu Gaolin
• Zhou Qing
• Deng Bangfei
• Wan Lingyun
• Xiao Qianbo
• Zhang Haibing
• Zhang Ying
• Zhang Wenjie
• Gan Jianfeng
• Wang Yuping
• Zhang Jiaqi
• Hu Haijun
• Liang Haipeng

Classifications

• G06F18/21

  Design or setup of recognition systems or techniques; Extraction of features in feature space; Blind source separation · CPC title

• G06T7/004 Primary

  Physics · mapped topic

• G06V2201/02

  Recognising information on displays, dials, clocks · CPC title

• G06T2207/20061

  Hough transform · CPC title

• G06T7/00 Primary

  Image analysis · CPC title