Photoelectric detection and acquisition system and centroid detection method based on single-pixel detector

Patent metadata

Field	Value
Publication number	US-12442919-B2
Application number	US-202117628631-A
Country	US
Kind code	B2
Filing date	May 14, 2021
Priority date	May 15, 2020
Publication date	Oct 14, 2025
Grant date	Oct 14, 2025

Abstract

A centroid detection method based on a single-pixel detector, including: S1: establishing a photoelectric detection and acquisition system, and generating three two-dimensional (2D) array matrices A, B and C; S2: generating, by letting element value of each column in the matrix A be the corresponding serial number of the column, element value of each row in the matrix B be the corresponding serial number of the row, and element value of the matrix C be 1, 2D modulation information having distribution of the matrices A, B and C; S3: modulating illumination light according to the mode of the 2D modulation information and projecting the illumination light to a target object or modulating, according to the mode of the 2D modulation information, an image formed by the target object; and S4: acquiring intensity value of target reflected light to obtain position parameter of the target centroid.

First claim

What is claimed is:

1. A centroid detection method based on a single-pixel detector, comprising the following steps:
S 1 : establishing a photoelectric detection and acquisition system, wherein the photoelectric detection and acquisition system comprises a light generation component, a digital micromirror device (DMD), a lens, a photodetector that are arranged along a light path and a data acquisition unit that is coupled to the photodetector, and the light generation component in the photoelectric detection and acquisition system generates three two-dimensional (2D) array matrices A, B and C;
S 2 : generating, by letting element value of each column in the matrix A be the corresponding serial number of the column, element value of each row in the matrix B be the corresponding serial number of the row, and element value of the matrix C be 1, 2D modulation information having distribution of the matrices A, B and C;
S 3 : modulating illumination light according to the mode of the 2D modulation information and projecting the illumination light to a target object or modulating, according to the mode of the 2D modulation information, an image formed by the target object; and
S 4 : acquiring intensity value of target reflected light with the data acquisition unit in the photoelectric detection and acquisition system, and substituting the intensity value into a centroid solving algorithm to obtain position parameter of the target centroid.

2. The centroid detection method based on a single-pixel detector according to claim 1 , wherein a light beam of the light generation component is projected to the DMD, and light modulated by the DMD is projected to the target object through the lens; and a light signal reflected by the target object is converted by the photodetector into an electrical signal, and the electrical signal is sent to the data acquisition unit.

3. The centroid detection method based on a single-pixel detector according to claim 1 , wherein a light beam of the light generation component is projected to the target object, and light reflected by the target object is projected to the DMD through the lens; the DMD modulates received light to generate a light signal and transmits the light signal to the photodetector; and the photodetector converts the light signal into an electrical signal and sends the electrical signal to the data acquisition unit.

4. The centroid detection method based on a single-pixel detector according to claim 2 , wherein step S 2 is implemented by letting the element values of the matrices A, B and C in the 2D modulation information meet the following equations respectively: S 1 (x,y)=x, S 2 (x,y)=y and S 3 (x,y)=1, wherein a function S(x,y) represents an element value corresponding to a coordinate (x,y) in a 2D matrix.

5. The centroid detection method based on a single-pixel detector according to claim 4 , wherein step S 4 specifically comprises the following steps:
S41: acquiring intensity value of reflected light of the target object with the data acquisition unit from the following equations:

I
1

=

∑

x
,
y

f
⁡
(

x
,
y

)

·

S
1

(

x
,
y

)

,

I
2

=

∑

x
,
y

f
⁡
(

x
,
y

)

·

S
2

(

x
,
y

)

⁢

and

⁢

I
3

=

∑

x
,
y

f
⁡
(

x
,
y

)

·

S
3

(

x
,
y

)

,

wherein ƒ(x,y) is 2D distribution function of the target object or the image formed by the target object, and each of I 1 , I 2 and I 3 is the intensity value acquired with the data acquisition unit; and
S42: substituting the intensity value into the centroid solving algorithm to obtain an equation on the centroid position of the target object: x c =I 1 /I 3 and y c =I 2 /I 3 , wherein (x c , y c ) is the position coordinate of the target centroid.

6. The centroid detection method based on a single-pixel detector according to claim 3 , wherein step S 2 is implemented by letting the element values of the matrixes A, B and C in the 2D modulation information meet the following equations respectively: S 1 (x,y)=x, S 2 (x,y)=y and S 3 (x,y)=1, wherein a function S(x,y) represents an element value corresponding to a coordinate (x,y) in a 2D matrix.

7. The centroid detection method based on a single-pixel detector according to claim 6 , wherein step S 4 specifically compri

Assignees

• Hefei Inst Physical Sci Cas

Inventors

• Wang Yingjian
• Shi Dongfeng
• Huang Jian
• Yuan Ke'E
• Zha Linbin

Classifications

• G01S7/4816

  of receivers alone · CPC title

• G06F17/15

  Correlation function computation {including computation of convolution operations (arithmetic circuits for sum of products per se, e.g. multiply-accumulators G06F7/5443; digital filters, e.g. FIR, IIR, adaptive filters H03H17/00)} · CPC title

• G01S17/06 Primary

  Systems determining position data of a target · CPC title

• G01M1/122 Primary

  Determining position of centre of gravity · CPC title