CN102929442A - Method for correcting optical sensing signal - Google Patents
Method for correcting optical sensing signal Download PDFInfo
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- CN102929442A CN102929442A CN2012103845439A CN201210384543A CN102929442A CN 102929442 A CN102929442 A CN 102929442A CN 2012103845439 A CN2012103845439 A CN 2012103845439A CN 201210384543 A CN201210384543 A CN 201210384543A CN 102929442 A CN102929442 A CN 102929442A
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- 238000000034 method Methods 0.000 title claims abstract description 26
- 238000010586 diagram Methods 0.000 description 17
- 238000009434 installation Methods 0.000 description 10
- 230000004044 response Effects 0.000 description 6
- 238000001514 detection method Methods 0.000 description 5
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- 238000012905 input function Methods 0.000 description 3
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Abstract
The invention provides a method for correcting an optical sensing signal, which comprises the following steps: generating a first set of reference data when a light source is turned off; generating a second set of reference data when the light source is turned on to a first brightness and the object is not sensed; generating a first set of calibration parameters according to the first set of reference data and the second set of reference data; sensing an object to generate a first set of sensing data when the light source is turned on to the first brightness; obtaining a second set of sensing data according to the first set of sensing data and the second set of reference data; and obtaining a first set of corrected sensing data according to the second set of sensing data and the first set of correction parameters.
Description
Technical field
The present invention relates to a kind of method of calibrating optical sensing signal, particularly relate to a kind of method that reduces the calibrating optical sensing signal of or error that sensing cell property difference produce inhomogeneous because of light source.
Background technology
Progress along with relevant science and technology, the optics detection technology is applied on the various electronic installations gradually, for instance, the optics detection technology can be applicable to the touch-control input function of electronic installation, allow the user input instruction in the mode of touch-control, perhaps, the optics detection technology can be applicable to the image scanning function of electronic installation, allows the user can utilize electronic installation to scan the image of object.Yet, the optics detection technology needs light source (for example back light) so that object is carried out sensing, when the light that is projeced into the optics sensing array is inhomogeneous, the optics sensing signal that the optics sensing array produces has error, in addition, response characteristic between the sensing cell of optics sensing array can be inconsistent because of signal to noise ratio (S/N ratio) (signal to noise ratio, the SNR) difference of element.Therefore, known optics detection technology easily or sensing cell property difference inhomogeneous because of light source so that the distortion of optics sensing signal.
Summary of the invention
The invention provides a kind of method of calibrating optical sensing signal, the method is contained in and produces one first group of reference data when a light source is closed; Be opened into one first brightness and do not produce one second group of reference data during sensed object in this light source; Produce one first group of correction parameter according to this first group of reference data and this second group of reference data; Sensing one object is to produce one first group of sense data when this light source is opened into this first brightness; Obtain one second group of sense data according to this first group of sense data and this second group of reference data; Reach according to this second group of sense data and this first group of correction parameter and obtain one first group of correction sense data.
The present invention provides a kind of optical sensing apparatus in addition, and this optical sensing apparatus comprises a light source, in order to produce light; One optics sensing array is in order to the light sensed object that produces according to this light source; And a correcting unit, in order to proofread and correct the optics sensing signal of this optics sensing array; Wherein this optics sensing array produces one first group of reference data when a light source is closed; This optics sensing array is opened into one first brightness and does not produce one second group of reference data during sensed object in this light source; This correcting unit produces one first group of correction parameter according to this first group of reference data and this second group of reference data; This optics sensing array when this light source is opened into this first brightness sensing one object to produce one first group of sense data; This correcting unit obtains one second group of sense data according to this first group of sense data and this second group of reference data; And this correcting unit obtains one first group of correction sense data according to this second group of sense data and this first group of correction parameter.
Compared to prior art, the invention provides a kind of method and optical sensing apparatus thereof of calibrating optical sensing signal.The method of calibrating optical sensing signal of the present invention can be eliminated the error that produces because light is inhomogeneous and effectively because of the inconsistent error that produces of sensing cell signal to noise ratio (S/N ratio), therefore.The method of calibrating optical sensing signal of the present invention can make the optics sensing signal of optical sensing apparatus undistorted.
Description of drawings
Fig. 1 is the synoptic diagram of optical sensing apparatus of the present invention;
Fig. 2 is the synoptic diagram that optical sensing apparatus of the present invention produces first group of reference data;
Fig. 3 is the synoptic diagram that optical sensing apparatus of the present invention produces second group of reference data;
Fig. 4 is the synoptic diagram that optical sensing apparatus of the present invention produces first group of correction parameter;
Fig. 5 is the synoptic diagram that optical sensing apparatus of the present invention produces first group of sense data;
Fig. 6 is the synoptic diagram that optical sensing apparatus of the present invention obtains second group of sense data;
Fig. 7 is that optical sensing apparatus of the present invention obtains first group of synoptic diagram of proofreading and correct sense data;
Fig. 8 is the process flow diagram of the control method of grouping device of the present invention.
Reference numeral
100: optical sensing apparatus 110: light source
120: optics sensing array 122: sensing cell
130: controller 132: correcting unit
134: internal memory 200: electronic installation
800: process flow diagram 810 to 860: step
R11-Rmn: first group of reference data R11 '-Rmn ': second group of reference data
C11-Cmn: first group of correction parameter S11-Smn: first group of sense data
S11 '-Smn ': second group of sense data D11-Dmn: proofread and correct sense data for first group
Embodiment
Please refer to Fig. 1, Fig. 1 is the synoptic diagram of optical sensing apparatus 100 of the present invention.As shown in Figure 1, optical sensing apparatus 100 of the present invention comprises light source 110, optics sensing array 120, and controller 130.Light source 110 is in order to producing light, and with ray cast to optics sensing array 120.Light source 110 can be the light source of back light or other type.Optics sensing array 120 comprises a plurality of sensing cells 122, in order to the light sensed object that produces according to light source 110.Controller 130 comprises correcting unit 132, in order to the optics sensing signal of calibrating optical sensing array 120.
Please also refer to the 2nd to 7 figure, and in the lump with reference to figure 1.Fig. 2 is the synoptic diagram that optical sensing apparatus 100 of the present invention produces first group of reference data, Fig. 3 is the synoptic diagram that optical sensing apparatus 100 of the present invention produces second group of reference data, Fig. 4 is the synoptic diagram that optical sensing apparatus 100 of the present invention produces first group of correction parameter, Fig. 5 is the synoptic diagram that optical sensing apparatus 100 of the present invention produces first group of sense data, Fig. 6 is the synoptic diagram that optical sensing apparatus 100 of the present invention obtains second group of sense data, and Fig. 7 is that optical sensing apparatus 100 of the present invention obtains first group of synoptic diagram of proofreading and correct sense data.
As shown in Figure 2, when light source 110 was closed, optics sensing array 120 can produce first group of reference data R11-Rmn accordingly, and first group of reference data R11-Rmn makes the response characteristic of sensing cell 122 consistent in order to proofread and correct the response characteristic of sensing cell 122.
As shown in Figure 3, when light source 110 is opened into the first brightness and optics sensing array 120 not during sensed object, optics sensing array 120 can produce second group of reference data R11 '-Rmn ' accordingly, second group of reference data R11 '-Rmn ' makes the sensing benchmark of sensing cell consistent in order to proofread and correct because of the inhomogeneous error that produces of the light that is projected to the optics sensing array.
As shown in Figure 4, in order to proofread and correct the response characteristic of sensing cell 122, correcting unit 132 can produce first group of correction parameter C11-Cmn according to first group of reference data R11-Rmn and second group of reference data R11 '-Rmn '.For instance, correcting unit 132 can be with second group of reference data R11 '-Rmn ' respectively divided by first group of reference data R11-Rmn to produce first group of correction parameter C11-Cmn.The signal to noise ratio (S/N ratio) (signal to noise ratio, SNR) of the sensing cell 132 that first group of correction parameter C11-Cmn represents optics sensing array 130 between when light source 110 is opened into the first brightness and light source and closes.
As shown in Figure 5, when light source 110 is opened into the first brightness, but optics sensing array 120 sensed object also produce first group of sense data S11-Smn accordingly, first group of sense data S11-Smn is not calibrated sense data, therefore first group of sense data S11-Smn comprises the error that produces because light is inhomogeneous, and because of the inconsistent error that produces of sensing cell signal to noise ratio (S/N ratio).
As shown in Figure 6, in order to proofread and correct because of the inhomogeneous error that produces of the light that is projected to optics sensing array 120, correcting unit 132 can obtain second group of sense data according to first group of sense data S11-Smn and second group of reference data R11 '-Rmn '.For instance, correcting unit 132 can deduct first group of sense data S11-Smn second group of reference data R11 '-Rmn ' to obtain this second group of sense data S11 '-Smn '.Owing to produced by optics sensing array 120 sensed object when first group of sense data S11-Smn is opened into the first brightness by light source 110, and second group of reference data R11 '-Rmn ' is opened into the first brightness and optics sensing array 120 by light source 110 and do not produced during sensed object, therefore the sensing benchmark of second group of sense data S11 '-Smn ' of correcting unit 132 generations can be consistent, and namely second group of sense data S11 '-Smn ' do not comprised because of the inhomogeneous error that produces of the light that is projected to optics sensing array 120 yet.
As shown in Figure 7, in order to proofread and correct the response characteristic of sensing cell 122, correcting unit 132 can obtain first group of correction sense data D11-Dmn according to second group of sense data S11 '-Smn ' and first group of correction parameter C11-Cmn.For instance, correcting unit 132 can be proofreaied and correct sense data D11-Dmn divided by first group of correction parameter C11-Cmn to obtain first group with second group of sense data S11 '-Smn '.Owing to second group of sense data S11 '-Smn ' eliminated the error that produces because light is inhomogeneous, and first group of correction parameter C11-Cmn represents the signal to noise ratio (S/N ratio) of the sensing cell 122 of optics sensing array 120, therefore first group of correcting unit 132 generations response characteristic of proofreading and correct sense data D11-Dmn can be consistent, and namely first group of correction sense data D11-Dmn do not comprised because of the inconsistent error that produces of sensing cell signal to noise ratio (S/N ratio) yet.
According to above-mentioned configuration, optical sensing apparatus 100 of the present invention can be eliminated the error that produces because light is inhomogeneous effectively, and because of the inconsistent error that produces of sensing cell 122 signal to noise ratio (S/N ratio)s.
Moreover optical sensing apparatus 100 of the present invention can be by touch-control input function and the image scanning function of brightness to be applied to respectively electronic installation 200 of adjusting light source.For instance, when optical sensing apparatus 100 was applied to the touch-control input function of electronic installation 200, optical sensing apparatus 100 can be opened into light source 110 the first brightness and proofread and correct sense data to produce first group; And when optical sensing apparatus 100 is applied to the image scanning function of electronic installation 200, optics sensing array 120 can be in addition be opened into the second brightness and produce the 3rd group of reference data during sensed object in light source 110, correcting unit 132 produces second group of correction parameter according to first group of reference data and the 3rd group of reference data again, optics sensing array 120 again when light source 110 is opened into the second brightness sensed object to produce the 3rd group of sense data, correcting unit 132 obtains the 4th group of sense data according to the 3rd group of sense data and the 3rd group of reference data again, and correcting unit 132 also further obtains second group of correction sense data according to the 4th group of sense data and second group of correction parameter.So, electronic installation 200 can be proofreaied and correct sense data according to first group and carry out touch control operation, and proofreaies and correct sense data generation scan-image according to second group.
In addition, the controller 130 of optical sensing apparatus 100 can comprise an internal memory 134 in addition, the correction sense data that produces in order to store correcting unit 132, and further will proofread and correct sense data and be sent to electronic installation 200 to carry out touch control operation or generation scan-image.
Please refer to Fig. 8, Fig. 8 is the process flow diagram 800 of the method for calibrating optical sensing signal of the present invention.The flow process of the method for calibrating optical sensing signal of the present invention such as following step:
Step 810: optics sensing array 120 produces first group of reference data when light source 110 is closed;
Step 820: optics sensing array 120 is opened into the first brightness and does not produce second group of reference data during sensed object in light source 110;
Step 830: produce first group of correction parameter according to first group of reference data and second group of reference data;
Step 840: sensed object was to produce first group of sense data when optics sensing array 120 was opened into the first brightness in light source 110;
Step 850: obtain second group of sense data according to first group of sense data and second group of reference data; And
Step 860: obtain first group of correction sense data according to second group of sense data and first group of correction parameter.
Compared to prior art, the invention provides a kind of method and optical sensing apparatus thereof of calibrating optical sensing signal.The method of calibrating optical sensing signal of the present invention can be eliminated the error that produces because light is inhomogeneous and effectively because of the inconsistent error that produces of sensing cell signal to noise ratio (S/N ratio), therefore.The method of calibrating optical sensing signal of the present invention can make the optics sensing signal of optical sensing apparatus undistorted.
The above only is preferred embodiment of the present invention, and all equalizations of doing according to the present patent application claim change and modify, and all should belong to protection scope of the present invention.
Claims (10)
1. the method for a calibrating optical sensing signal is characterized in that, comprises:
When closing, a light source produces one first group of reference data;
Be opened into one first brightness and do not produce one second group of reference data during sensed object in this light source;
Produce one first group of correction parameter according to this first group of reference data and this second group of reference data;
Sensing one object is to produce one first group of sense data when this light source is opened into this first brightness;
Obtain one second group of sense data according to this first group of sense data and this second group of reference data; And
Obtain one first group of correction sense data according to this second group of sense data and this first group of correction parameter.
2. method according to claim 1 is characterized in that, other comprises according to this group correction sense data generation one scan image.
3. method according to claim 1, it is characterized in that, produce this first group of correction parameter according to this first group of reference data and this second group of reference data, for this second group of reference data divided by this first group of reference data to produce this first group of correction parameter.
4. method according to claim 1, it is characterized in that, obtain this second group of sense data according to this first group of sense data and this second group of reference data, for this first group of sense data being deducted this second group of reference data to obtain this second group of sense data.
5. method according to claim 1, it is characterized in that, obtain this first group correction sense data according to this second group of sense data and this first group of correction parameter, for this second group of sense data proofreaied and correct sense data divided by this first group of correction parameter to obtain this first group.
6. method according to claim 1 is characterized in that, other comprises:
Be opened into the second brightness and do not produce one the 3rd group of reference data during sensed object in this light source;
Produce one second group of correction parameter according to this first group of reference data and the 3rd group of reference data;
Sensing one object is to produce one the 3rd group of sense data when this light source is opened into the second brightness;
Obtain one the 4th group of sense data according to the 3rd group of sense data and the 3rd group of reference data; And
Obtain one second group of correction sense data according to the 4th group of sense data and this second group of correction parameter.
7. an optical sensing apparatus is characterized in that, comprises:
One light source is in order to produce light;
One optics sensing array is in order to the light sensed object that produces according to this light source; And
One correcting unit is in order to proofread and correct the optics sensing signal of this optics sensing array;
Wherein this optics sensing array produces one first group of reference data when a light source is closed; This optics sensing array is opened into one first brightness and does not produce one second group of reference data during sensed object in this light source; This correcting unit produces one first group of correction parameter according to this first group of reference data and this second group of reference data; This optics sensing array when this light source is opened into this first brightness sensing one object to produce one first group of sense data; This correcting unit obtains one second group of sense data according to this first group of sense data and this second group of reference data; And this correcting unit obtains one first group of correction sense data according to this second group of sense data and this first group of correction parameter.
8. optical sensing apparatus according to claim 7 is characterized in that, this first group is proofreaied and correct sense data is the one scan image.
9. optical sensing apparatus according to claim 7 is characterized in that, this light source is a back light.
10. optical sensing apparatus according to claim 7 is characterized in that, other comprises an internal memory, proofreaies and correct sense data in order to store this first group.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| TW101129355A TWI458942B (en) | 2012-08-14 | 2012-08-14 | Method for correcting optical sensing signals and optical sensing device |
| TW101129355 | 2012-08-14 |
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| Publication Number | Publication Date |
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| CN102929442A true CN102929442A (en) | 2013-02-13 |
| CN102929442B CN102929442B (en) | 2015-11-04 |
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Cited By (3)
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| CN104216027A (en) * | 2013-05-29 | 2014-12-17 | 光宝新加坡有限公司 | Proximity sensing method, proximity sensing device and electrical device |
| CN108688170A (en) * | 2017-04-07 | 2018-10-23 | 必能信超声公司 | Compensate the optical feedback signal of the background infrared radiation in Laser room |
| CN114682524A (en) * | 2020-12-31 | 2022-07-01 | 合肥美亚光电技术股份有限公司 | Signal correction method and device and sorting equipment |
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| JP2008310374A (en) * | 2007-06-12 | 2008-12-25 | Mitsubishi Electric Corp | Method and apparatus for checking touch panel function |
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| TWI421753B (en) * | 2010-08-12 | 2014-01-01 | Lite On Semiconductor Corp | Calibration method, detection device and optical touch panel for optical touch panel |
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- 2012-08-14 TW TW101129355A patent/TWI458942B/en not_active IP Right Cessation
- 2012-10-11 CN CN201210384543.9A patent/CN102929442B/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| JP2008250495A (en) * | 2007-03-29 | 2008-10-16 | Smk Corp | Optical input device |
| US20110090158A1 (en) * | 2009-10-15 | 2011-04-21 | Sony Corporation | Information input device, information input program, and electronic instrument |
| CN101976155A (en) * | 2010-10-01 | 2011-02-16 | 苏州佳世达电通有限公司 | Method for correcting image sensor |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104216027A (en) * | 2013-05-29 | 2014-12-17 | 光宝新加坡有限公司 | Proximity sensing method, proximity sensing device and electrical device |
| CN104216027B (en) * | 2013-05-29 | 2017-05-10 | 光宝新加坡有限公司 | Proximity sensing method, proximity sensing device and electrical device |
| CN108688170A (en) * | 2017-04-07 | 2018-10-23 | 必能信超声公司 | Compensate the optical feedback signal of the background infrared radiation in Laser room |
| CN108688170B (en) * | 2017-04-07 | 2021-10-19 | 必能信超声公司 | Optical feedback signal to compensate for background infrared radiation in a laser chamber |
| CN114682524A (en) * | 2020-12-31 | 2022-07-01 | 合肥美亚光电技术股份有限公司 | Signal correction method and device and sorting equipment |
| CN114682524B (en) * | 2020-12-31 | 2023-07-28 | 合肥美亚光电技术股份有限公司 | Signal correction method and device and sorting equipment |
Also Published As
| Publication number | Publication date |
|---|---|
| TWI458942B (en) | 2014-11-01 |
| TW201407137A (en) | 2014-02-16 |
| CN102929442B (en) | 2015-11-04 |
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