Method for determining optical sensing correction parameters, biological feature detection apparatus and electronic terminal

• US 10,289,886 B2
• Filed: 10/27/2017
• Issued: 05/14/2019
• Est. Priority Date: 07/17/2017
• Status: Active Grant

• Current Assignee: Shenzhen Goodix Technology Co., Ltd.
• Original Assignee: Shenzhen Goodix Technology Co., Ltd.
• Inventors: Yin, Ting, Gu, Jing, Pang, Shu
• Primary Examiner(s): Werner, Brian
• Application Number:
  US15/796,731
• Publication Number:
  US 20190019002A1
• Time in Patent Office: 564 Days
• CPC Class Codes: G06V 10/98 Detection or correction of errors, e.g. by rescanning the pattern or by human intervention; Evaluation of the quality of the acquired patterns
• CPC Class Codes: G06V 40/1318 using electro-optical elements or layers, e.g. electroluminescent sensing
• CPC Class Codes: G06V 40/1347 Preprocessing; Feature extraction
• CPC Class Codes: H04N 17/002 for television cameras
• CPC Class Codes: H04N 25/443 by reading pixels from selected 2D regions of the array, e.g. for windowing or digital zooming
• CPC Class Codes: H04N 25/671 for non-uniformity detection or correction
• CPC Class Codes: H04N 25/673 by using reference sources

Abstract

Embodiments of the present application provide a method for determining optical sensing correction parameters, a biological feature detection apparatus and an electronic terminal. The method includes: determining a light intensity of this group of optical signals according to output data generated by a plurality of optical sensing units once under irradiation of the same group of optical signals to determine light intensities of a plurality of groups of optical signals; and determining optical sensing correction parameters of the plurality of optical sensing units according to the output data generated by the plurality of optical sensing units once under irradiation of each group of optical signals and the light intensities of the plurality of groups of optical signals.

Claims

1. A method for determining optical sensing correction parameters, comprising:

subjecting a plurality of optical sensing units in an optical sensing array to irradiation respectively with the use of a plurality of groups of optical signals, wherein each optical sensing unit generates a group of output data once under irradiation of each group of optical signals;

determining a light intensity of this group of optical signals according to the output data generated by the plurality of optical sensing units once under irradiation of the same group of optical signals; and

determining optical sensing correction parameters of the plurality of optical sensing units according to the output data generated by the plurality of optical sensing units once under irradiation of the plurality of groups of optical signals and the light intensities of the plurality of groups of optical signals.

2. The method according to claim 1, wherein the plurality of optical sensing units in the optical sensing array are sequentially irradiated with the use of the plurality of groups of optical signals at a constant light environment.

3. The method according to claim 2, wherein the constant light environment is implemented by:

covering a surface-uniform object on a surface of an electronic terminal using the optical sensing array, or placing the electronic terminal using the optical sensing array in a darkroom.

4. The method according to claim 1, wherein the plurality of groups of optical signals are generated by a light source arranged outside an electronic terminal using the optical sensing array, or are generated by a display light source inside the electronic terminal.

5. The method according to claim 1, wherein the determining a light intensity of this group of optical signals according to the output data generated by the plurality of optical sensing units once under irradiation of the same group of optical signals comprises:

respectively determining a plurality of first statistical values according to a plurality of pieces of output data generated by the plurality of optical sensing units once under irradiation of the same group of optical signals, wherein each first statistical value corresponds to an optical sensing unit; and

determining a light intensity of each group of optical signals according to the plurality of first statistical values.

6. The method according to claim 5, wherein the first statistical value is an average value of a group of output data generated by a corresponding optical sensing unit once under irradiation of a group of optical signals.

7. The method according to claim 5, wherein the determining a light intensity of each group of optical signals according to the plurality of first statistical value comprises:

determining a second statistical value corresponding to a group of optical signals according to the plurality of first statistical values, and using the second statistical value as the light intensity of this group of optical signals.

8. The method according to claim 7, wherein the second statistical value is an average value of the plurality of first statistical values.

9. The method according to claim 1, wherein determining optical sensing correction parameters of the plurality of optical sensing units according to the output data generated by the plurality of optical sensing units once under irradiation of the plurality of groups of optical signals and the light intensities of the plurality of groups of optical signals comprises:

determining an output data variation of each optical sensing unit once under irradiation of the plurality of groups of optical signals according to the output data generated by the plurality of optical sensing units once under irradiation of the plurality of groups of optical signals and the light intensities of the plurality of groups of optical signals; and

determining optical sensing correction parameters of the plurality of optical sensing units according to the output data variation of each optical sensing unit once under irradiation of the plurality of groups of optical signals.

10. The method according to claim 9, wherein

the determining optical sensing correction parameters of the plurality of optical sensing units according to the output data variation of each optical sensing unit once under irradiation of the plurality of groups of optical signals comprises:

determining the output data variation of each optical sensing unit once under irradiation of different groups of optical signals according to a linear fitting parameter between a plurality of groups of output data and the plurality of groups of optical signals; and

determining the optical sensing correction parameters of the plurality of optical sensing units according to the output data variation of each optical sensing unit once under irradiation of different groups of optical signals.

11. The method according to claim 10, wherein the linear fitting parameter between the plurality of groups of output data and the plurality of groups of optical signals is obtained by:

performing two different statistical value calculations for the light intensities of the plurality of groups of optical signals to obtain a third statistical value and a fourth statistical value; and

determining the linear fitting parameter between the plurality of groups of output data and the plurality of groups of optical signals according to the third statistical value and the fourth statistical value.

12. The method according to claim 11, wherein the third statistical value is an average value of first powers of the light intensities of the plurality of groups of optical signals, and the fourth statistical value is an average value of squares of the light intensities of the plurality of groups of optical signals.

13. The method according to claim 11, wherein the linear fitting parameter is determined according to a difference between the third statistical value and the fourth statistical value.

14. The method according to claim 10, wherein the determining the output data variation of each optical sensing unit once under irradiation of different groups of optical signals according to a linear fitting parameter between a plurality of groups of output data and the plurality of groups of optical signals comprises:

determining a fifth statistical value corresponding to the sensing unit according to the plurality of groups of output data generated by each sensing unit once under irradiation of the plurality of groups of optical signals;

determining a sixth statistical value corresponding to each optical sensing unit according to the light intensities of the plurality of groups of optical signals and the plurality of groups of output data generated by each optical sensing unit once under irradiation of the plurality of groups of optical signals; and

determining the linear fitting parameter between the plurality of groups of output data and the plurality of groups of optical signals according to the fifth statistical value and the sixth statistical value corresponding to each optical sensing unit.

15. The method according to claim 14, wherein the fifth statistical value is an average value of the plurality of groups of output data generated by each optical sensing unit once under irradiation of the optical signals, and the sixth statistical value is an average value of products of the light intensities of the optical signals and the plurality of groups of output data.

16. The method according to claim 14, wherein the linear fitting parameter is determined according to a difference between the fifth statistical value and the sixth statistical value.

17. The method according to claim 1, further comprising:

storing the optical correction parameters of the optical sensing units in a memory; and

during biological feature detection, correcting the output data of the optical sensing units according to the optical correction parameters.

18. A biological feature detection apparatus, comprising:

an optical sensing array, comprising a plurality of optical sensing units configured to receive irradiation from the plurality of groups of optical signals, each optical sensing unit generating a group of output data once under irradiation of each group of optical signals; and

a detection chip, configured to determine a light intensity of this group of optical signals according to the output data generated by the plurality of optical sensing units once under irradiation of the same group of optical signals to determine light intensities of the plurality of groups of optical signals, and determine optical sensing correction parameters of the plurality of optical sensing units according to output data generated by the plurality of optical sensing units once under irradiation of each groups of optical signals and the light intensities of the plurality of groups of optical signals.

19. An electronic terminal, comprising a processor configured to implement a method comprising:

determining a light intensity of a group of optical signals according to output data generated by a plurality of optical sensing units in an optical sensing array once under irradiation of the group of optical signals, wherein the plurality of optical sensing units is subjected to irradiation respectively with the use of a plurality of groups of optical signals, and each optical sensing unit generates a group of output data once under irradiation of each group of optical signals, and

determining optical sensing correction parameters of the plurality of optical sensing units according to the output data generated by the plurality of optical sensing units once under irradiation of the plurality of groups of optical signals and the light intensities of the plurality of groups of optical signals.