CN115406536B - Control method of spectrocolorimeter lighting system - Google Patents
Control method of spectrocolorimeter lighting system Download PDFInfo
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- CN115406536B CN115406536B CN202211084888.2A CN202211084888A CN115406536B CN 115406536 B CN115406536 B CN 115406536B CN 202211084888 A CN202211084888 A CN 202211084888A CN 115406536 B CN115406536 B CN 115406536B
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- 238000000034 method Methods 0.000 title claims abstract description 31
- 230000003595 spectral effect Effects 0.000 claims abstract description 46
- 238000001228 spectrum Methods 0.000 claims abstract description 40
- 238000002310 reflectometry Methods 0.000 claims abstract description 35
- 230000001360 synchronised effect Effects 0.000 claims abstract description 30
- 238000005286 illumination Methods 0.000 claims description 13
- 230000000737 periodic effect Effects 0.000 claims description 3
- 238000005259 measurement Methods 0.000 description 7
- 238000010586 diagram Methods 0.000 description 4
- 230000004927 fusion Effects 0.000 description 4
- 238000010521 absorption reaction Methods 0.000 description 3
- 229920006395 saturated elastomer Polymers 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 238000009738 saturating Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J3/00—Spectrometry; Spectrophotometry; Monochromators; Measuring colours
- G01J3/46—Measurement of colour; Colour measuring devices, e.g. colorimeters
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J3/00—Spectrometry; Spectrophotometry; Monochromators; Measuring colours
- G01J3/02—Details
- G01J3/0205—Optical elements not provided otherwise, e.g. optical manifolds, diffusers, windows
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- Spectroscopy & Molecular Physics (AREA)
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- Spectrometry And Color Measurement (AREA)
Abstract
The invention discloses a control method of a spectrocolorimeter lighting system, which comprises the following steps: s11, the synchronous control circuit controls the first pulse driving circuit and the second pulse driving circuit to simultaneously generate pulse driving signals so as to drive the full-spectrum LED and the multicolor LED to illuminate, and the synchronous control circuit and the detector acquisition circuit drive the detector to expose; s12, after the pulse driving signal is changed from high to low, the synchronous control circuit and the detector acquisition circuit control the detector to end exposure, and a spectral reflectance curve under the current pulse driving signal is obtained; s13, repeating the steps S11 and S12 for a plurality of times, and increasing the time width of the pulse driving signal when repeating each time so as to obtain a spectrum reflectivity curve under the pulse driving signals with different time; s14, fusing the spectral reflectance curves under different time pulse driving signals to obtain a complete spectral reflectance curve of the object to be detected. The method can effectively acquire the high signal-to-noise ratio reflectivity curve or the high dynamic range spectrum reflectivity curve of the object.
Description
Technical Field
The invention relates to the technical field of color measurement, in particular to a control method of a spectrocolorimeter illumination system.
Background
The currently used spectrocolorimeter obtains the normalized spectral reflectivity of the object through one-time whiteboard calibration. When the reflectivity of the object is moderate, the error of obtaining the color data of the object by obtaining the normalized reflectivity spectrum curve is not large, but when the reflectivity of a dark object such as a dark gray mobile phone panel and the like at each wavelength is low, the response of a detector is low, and the measurement result is seriously influenced by photon noise, detector noise and the like. Or when the object reflectivity curve has strong and weak absorption or reflection characteristics, the high dynamic range reflectivity data can not be obtained through a calibration or direct measurement mode because the difference between the high and low characteristics or the strong and weak characteristics is obvious, and serious colorimetric measurement errors are also caused.
Disclosure of Invention
The invention aims to provide a control method of a spectrocolorimeter lighting system capable of obtaining a complete high dynamic range spectral reflectance curve of an object to be measured.
In order to solve the problems, the invention provides a control method of a spectrocolorimeter lighting system, wherein the lighting system comprises a full spectrum LED, a multicolor LED, a first pulse driving circuit, a second pulse driving circuit, a detector acquisition circuit and a synchronous control circuit, the first pulse driving circuit is connected with the full spectrum LED, the second pulse driving circuit is connected with the multicolor LED, the first pulse driving circuit and the second pulse driving circuit are both connected with the detector acquisition circuit through the synchronous control circuit, and the detector acquisition circuit is connected with the detector; the control method comprises the following steps:
s11, the synchronous control circuit controls the first pulse driving circuit and the second pulse driving circuit to simultaneously generate pulse driving signals so as to drive the full-spectrum LED and the multicolor LED to illuminate, and the synchronous control circuit and the detector acquisition circuit drive the detector to expose;
s12, after the pulse driving signal is changed from high to low, the synchronous control circuit and the detector acquisition circuit control the detector to end exposure, so as to obtain a spectral reflectance curve under the current pulse driving signal;
s13, repeating the steps S11 and S12 for a plurality of times, and increasing the time width of the pulse driving signal when repeating each time so as to obtain a spectrum reflectivity curve under the pulse driving signals with different time;
s14, fusing the spectral reflectance curves under different time pulse driving signals to obtain a complete spectral reflectance curve of the object to be detected.
As a further improvement of the present invention, in step S14, the spectral reflectance curves under different time pulse drive signals are fused using the following formula:
wherein f z The method comprises the steps of obtaining a complete high dynamic range spectrum reflectivity curve of an object to be detected; f (f) b1 ,f b2 ,…,f bn Spectral reflectance curves under the 1 st, 2 nd, … th and n th pulse driving signals respectively; a, a 2 ,…,a n The ratio of the width of the n pulse driving signals to the width of the 1 st pulse driving signal is 2 nd and … respectively; {.cndot } is the effective data selected in the individual spectral reflectance curves.
As a further improvement of the invention, n is not less than 3.
As a further improvement of the present invention, in step S11, the synchronization control circuit and the detector acquisition circuit drive the detector to expose before or simultaneously with the emission of the pulse drive signal.
The invention also provides a control method of the spectrocolorimeter lighting system, the lighting system comprises a full spectrum LED, a multicolor LED, a first pulse driving circuit, a second pulse driving circuit, a detector acquisition circuit and a synchronous control circuit, wherein the first pulse driving circuit is connected with the full spectrum LED, the second pulse driving circuit is connected with the multicolor LED, the first pulse driving circuit and the second pulse driving circuit are both connected with the detector acquisition circuit through the synchronous control circuit, and the detector acquisition circuit is connected with the detector; the control method comprises the following steps:
s21, the synchronous control circuit controls the first pulse driving circuit and the second pulse driving circuit to simultaneously generate periodic pulse driving signals so as to drive the full-spectrum LED and the multicolor LED to illuminate, and the synchronous control circuit and the detector acquisition circuit drive the detector to expose, wherein the exposure time is greater than or equal to the width of a single pulse driving signal, and a spectral reflectance curve under the current exposure time is obtained;
s22, repeating the step S21 for a plurality of times, and adjusting the exposure time when repeating each time to obtain a spectral reflectance curve under different exposure times;
s23, fusing the spectral reflectance curves under different exposure time to obtain a complete spectral reflectance curve of the object to be detected.
As a further improvement of the invention, in step S22, step S21 is repeated a plurality of times, the exposure time being adjusted each time, such that each exposure time corresponds to a different number of individual pulse drive signal widths.
As a further improvement of the present invention, in step S23, the spectral reflectance curves at different exposure times are fused using the following formula:
wherein f z The method comprises the steps of obtaining a complete high dynamic range spectrum reflectivity curve of an object to be detected; f (f) d1 ,f d2 ,…,f dm Spectral reflectance curves for exposure times corresponding to a number of pulses of 1,2, …, m, respectively; {.cndot } is the effective data selected in the individual spectral reflectance curves.
As a further improvement of the invention, m is not less than 3.
As a further development of the invention, in step S22, the exposure time is adjusted by increasing the time span or selecting a different time span each time it is repeated.
The invention has the beneficial effects that:
the control method of the spectrocolorimeter lighting system can effectively acquire the high signal-to-noise ratio reflectivity curve of the object with low reflectivity, and can effectively acquire the high dynamic range spectrum reflectivity curve of the object with high difference in high-low absorption or high-low reflection spectrum characteristics, so that high-precision chromaticity values such as Lab, luv and other color space coordinates are obtained, and the measurement precision of the spectrocolorimeter is improved.
The foregoing description is only an overview of the present invention, and is intended to be implemented in accordance with the teachings of the present invention, as well as the preferred embodiments thereof, together with the following detailed description of the invention, given by way of illustration only, together with the accompanying drawings.
Drawings
FIG. 1 is a schematic diagram of a spectrocolorimeter illumination system in an embodiment of the invention;
FIG. 2 is a flow chart of a method of controlling a spectrocolorimeter illumination system in an embodiment of the invention;
FIG. 3 is a schematic diagram showing the fusion of spectral reflectance curves under different time pulse driving signals according to an embodiment of the present invention;
FIG. 4 is a schematic diagram of a method of controlling a spectrocolorimeter illumination system in accordance with another embodiment of the invention;
FIG. 5 is a schematic diagram showing the fusion of spectral reflectance curves at different exposure times in another embodiment of the present invention.
Detailed Description
The present invention will be further described with reference to the accompanying drawings and specific examples, which are not intended to be limiting, so that those skilled in the art will better understand the invention and practice it.
The control method of the spectrocolorimeter lighting system in the embodiment of the invention is used for controlling the spectrocolorimeter lighting system, and referring to fig. 1, the lighting system comprises a full-spectrum LED, a multicolor LED, a first pulse driving circuit, a second pulse driving circuit, a detector acquisition circuit and a synchronous control circuit, wherein the first pulse driving circuit is connected with the full-spectrum LED, the second pulse driving circuit is connected with the multicolor LED, the first pulse driving circuit and the second pulse driving circuit are both connected with the detector acquisition circuit through the synchronous control circuit, and the detector acquisition circuit is connected with the detector; the integrating sphere homogenizes the full-spectrum LED2 and the multicolor LED3, and the homogenized light is incident on an object to be detected and is detected by the detector after being reflected. The detector has linear radiation response characteristics at each wavelength, and can be a CCD or CMOS detector.
As shown in fig. 2, the control method of the spectrocolorimeter illumination system in the embodiment of the invention includes the following steps:
step S11, a synchronous control circuit controls a first pulse driving circuit and a second pulse driving circuit to simultaneously generate pulse driving signals so as to drive full-spectrum LEDs and multicolor LEDs to illuminate, and a synchronous control circuit and a detector acquisition circuit drive the detector to expose; the synchronous control circuit and the detector acquisition circuit drive the detector to expose before or simultaneously with the emission of the pulse driving signal. The synchronous control circuit ensures the consistency of the pulse driving signal width for driving the full spectrum LED and the multicolor LED.
And step S12, after the pulse driving signal is changed from high to low, the synchronous control circuit and the detector acquisition circuit control the detector to end the exposure, and a spectral reflectivity curve under the current pulse driving signal is obtained.
Step S13, repeating step S11 and step S12 for a plurality of times, and increasing the time width of the pulse driving signal when repeating each time so as to obtain the spectral reflectivity curve under the pulse driving signals with different time.
And S14, fusing the spectral reflectance curves under different time pulse driving signals to obtain a complete spectral reflectance curve of the object to be detected.
Specifically, the spectral reflectance curves under different time pulse drive signals are fused using the following formula:
wherein f z The method comprises the steps of obtaining a complete high dynamic range spectrum reflectivity curve of an object to be detected; f (f) b1 ,f b2 ,…,f bn Spectral reflectance curves under the 1 st, 2 nd, … th and n th pulse driving signals respectively; a, a 2 ,…,a n The ratio of the width of the n pulse driving signals to the width of the 1 st pulse driving signal is 2 nd and … respectively; {.cndot } is the effective data selected in the individual spectral reflectance curves. The sub-wavelength ranges corresponding to these effective data locations are combined to form a complete measurement wavelength range, effectively removing saturated signals from the spectral profile and low signal-to-noise ratio profiles. Further, n is not less than 3。
Referring to fig. 3, alternatively, assume that the 1 st pulse driving signal width is Ts, the 2 nd pulse driving signal width is a times of Ts, the 2 nd pulse driving signal width is b times of Ts, and b > a >1.c is a multiple of the exposure time, c > b indicates that the exposure time is longer than the drive pulse time width. When the difference in the spectral curves of the objects is relatively large, as shown in the far right of fig. 3. The first, shortest time pulse illumination, a signal near the high reflectivity characteristic band location can be obtained without saturating the signal. When the pulse drive width is sequentially increased, the signal at the low reflectivity characteristic band appears, but the signal near the high reflectivity characteristic band becomes saturated. Further increasing the pulse drive time width, the saturation wavelength width at the high reflectivity characteristic band continues to expand, while the lower reflectivity characteristic band is measured. And finally, merging the effective spectrum data obtained under the drive illumination of each time pulse to obtain a complete high-dynamic spectrum curve. The middle part of fig. 3 is a spectrum reflectivity curve under three different time pulse driving signals, and the right side of fig. 3 is a spectrum reflectivity curve of the complete object to be measured obtained through fusion.
As shown in fig. 4, a control method of a spectrocolorimeter illumination system according to another embodiment of the present invention includes the steps of:
step S21, the synchronous control circuit controls the first pulse driving circuit and the second pulse driving circuit to simultaneously generate periodic pulse driving signals so as to drive the full-spectrum LED and the multicolor LED to illuminate, and the synchronous control circuit and the detector acquisition circuit drive the detector to expose, wherein the exposure time is greater than or equal to the width of a single pulse driving signal, and a spectral reflectance curve under the current exposure time is obtained.
Step S22, repeating the step S21 for a plurality of times, and adjusting the exposure time when repeating each time to obtain a spectral reflectance curve under different exposure times; optionally, the exposure time is adjusted by increasing the time span or selecting a different time span each time it is repeated.
And S23, fusing the spectral reflectance curves under different exposure time to obtain a complete spectral reflectance curve of the object to be detected.
Optionally, in step S22, step S21 is repeated a plurality of times, and the exposure time is adjusted each time, such that each exposure time corresponds to a different number of single pulse drive signal widths. The calculation can be convenient.
Further, in step S23, the spectral reflectance curves at different exposure times are fused using the following formula:
wherein f z The method comprises the steps of obtaining a complete high dynamic range spectrum reflectivity curve of an object to be detected; f (f) d1 ,f d2 ,…,f dm Spectral reflectance curves for exposure times corresponding to a number of pulses of 1,2, …, m, respectively; {.cndot } is the effective data selected in the individual spectral reflectance curves. Preferably, m.gtoreq.3.
Referring to FIG. 5, alternatively, assuming a single pulse drive signal width of Ts, the first detector exposure time is Ts+k 1 The second detector exposure time is 2Ts+k 2 The third detector exposure time is 3Ts+k 3 ，k 1 、k 2 、k 3 For exposure times longer than the redundancy time of the illumination pulses, k 1 、k 2 、k 3 Can be kept consistent. The middle part of fig. 5 is a spectrum reflectivity curve obtained under three exposure times, and the right side of fig. 5 is a spectrum reflectivity curve of the whole object to be measured obtained through fusion.
The control method of the spectrocolorimeter lighting system can effectively acquire the high signal-to-noise ratio reflectivity curve of the object with low reflectivity, and can effectively acquire the high dynamic range spectrum reflectivity curve of the object with high difference in high-low absorption or high-low reflection spectrum characteristics, so that high-precision chromaticity values such as Lab, luv and other color space coordinates are obtained, and the measurement precision of the spectrocolorimeter is improved.
The above embodiments are merely preferred embodiments for fully explaining the present invention, and the scope of the present invention is not limited thereto. Equivalent substitutions and modifications will occur to those skilled in the art based on the present invention, and are intended to be within the scope of the present invention. The protection scope of the invention is subject to the claims.
Claims (6)
1. The control method of the spectrocolorimeter lighting system is characterized in that the lighting system comprises a full-spectrum LED, a multicolor LED, a first pulse driving circuit, a second pulse driving circuit, a detector acquisition circuit and a synchronous control circuit, wherein the first pulse driving circuit is connected with the full-spectrum LED, the second pulse driving circuit is connected with the multicolor LED, the first pulse driving circuit and the second pulse driving circuit are both connected with the detector acquisition circuit through the synchronous control circuit, and the detector acquisition circuit is connected with the detector; the control method comprises the following steps:
s11, the synchronous control circuit controls the first pulse driving circuit and the second pulse driving circuit to simultaneously generate pulse driving signals so as to drive the full-spectrum LED and the multicolor LED to illuminate, and the synchronous control circuit and the detector acquisition circuit drive the detector to expose;
s12, after the pulse driving signal is changed from high to low, the synchronous control circuit and the detector acquisition circuit control the detector to end exposure, so as to obtain a spectral reflectance curve under the current pulse driving signal;
s13, repeating the steps S11 and S12 for a plurality of times, and increasing the time width of the pulse driving signal when repeating each time so as to obtain a spectrum reflectivity curve under the pulse driving signals with different time;
s14, fusing the spectral reflectance curves under different time pulse driving signals by adopting the following formula to obtain a complete spectral reflectance curve of the object to be detected;
wherein f z The method comprises the steps of obtaining a complete high dynamic range spectrum reflectivity curve of an object to be detected; f (f) b1 ,f b2 ,…,f bn 1 st, 2 nd, … th and n th pulse driving signals respectivelySpectral reflectance curve under number; a, a 2 ,…,a n The ratio of the width of the n pulse driving signals to the width of the 1 st pulse driving signal is 2 nd and … respectively; {.cndot } is the effective data selected in the individual spectral reflectance curves.
2. The method of controlling a spectrocolorimeter illumination system according to claim 1 wherein n.gtoreq.3.
3. The method of controlling a spectrocolorimeter illumination system according to claim 1, wherein in step S11, the synchronization control circuit and a detector acquisition circuit drive the detector exposure before or simultaneously with the emission of the pulse drive signal.
4. The control method of the spectrocolorimeter lighting system is characterized in that the lighting system comprises a full-spectrum LED, a multicolor LED, a first pulse driving circuit, a second pulse driving circuit, a detector acquisition circuit and a synchronous control circuit, wherein the first pulse driving circuit is connected with the full-spectrum LED, the second pulse driving circuit is connected with the multicolor LED, the first pulse driving circuit and the second pulse driving circuit are both connected with the detector acquisition circuit through the synchronous control circuit, and the detector acquisition circuit is connected with the detector; the control method comprises the following steps:
s21, the synchronous control circuit controls the first pulse driving circuit and the second pulse driving circuit to simultaneously generate periodic pulse driving signals so as to drive the full-spectrum LED and the multicolor LED to illuminate, and the synchronous control circuit and the detector acquisition circuit drive the detector to expose, wherein the exposure time is greater than or equal to the width of a single pulse driving signal, and a spectral reflectance curve under the current exposure time is obtained;
s22, repeating the step S21 for a plurality of times, and adjusting the exposure time when repeating each time, so that the exposure time of each time corresponds to different numbers of single pulse driving signal widths, and obtaining spectral reflectivity curves under different exposure times;
s23, fusing the spectral reflectance curves under different exposure time by adopting the following formula to obtain a complete spectral reflectance curve of the object to be detected;
wherein f z The method comprises the steps of obtaining a complete high dynamic range spectrum reflectivity curve of an object to be detected; f (f) d1 ,f d2 ,…,f dm Spectral reflectance curves for exposure times corresponding to a number of pulses of 1,2, …, m, respectively; {.cndot } is the effective data selected in the individual spectral reflectance curves.
5. The method of controlling a spectrocolorimeter illumination system according to claim 4 wherein m.gtoreq.3.
6. The method of controlling a spectrocolorimeter illumination system according to claim 4 wherein in step S22, the exposure time is adjusted by increasing the time span or selecting a different time span each time it is repeated.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
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| CN202211084888.2A CN115406536B (en) | 2022-09-06 | 2022-09-06 | Control method of spectrocolorimeter lighting system |
| PCT/CN2022/142176 WO2024051037A1 (en) | 2022-09-06 | 2022-12-27 | Control method for spectro-colorimeter illumination system |
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| CN202211084888.2A CN115406536B (en) | 2022-09-06 | 2022-09-06 | Control method of spectrocolorimeter lighting system |
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| CN115406536A CN115406536A (en) | 2022-11-29 |
| CN115406536B true CN115406536B (en) | 2023-09-29 |
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| CN115406536B (en) * | 2022-09-06 | 2023-09-29 | 苏州普立视科技有限公司 | Control method of spectrocolorimeter lighting system |
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| JP3577977B2 (en) * | 1998-02-09 | 2004-10-20 | 凸版印刷株式会社 | Illumination light spectral characteristic estimation device |
| JP5487884B2 (en) * | 2009-11-05 | 2014-05-14 | セイコーエプソン株式会社 | Image processing apparatus and image processing method |
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| JP2015087144A (en) * | 2013-10-29 | 2015-05-07 | セイコーエプソン株式会社 | Spectrometry device and spectrometry method |
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| CN115406536B (en) * | 2022-09-06 | 2023-09-29 | 苏州普立视科技有限公司 | Control method of spectrocolorimeter lighting system |
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- 2022-09-06 CN CN202211084888.2A patent/CN115406536B/en active Active
- 2022-12-27 WO PCT/CN2022/142176 patent/WO2024051037A1/en unknown
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| JP2002267600A (en) * | 2001-03-12 | 2002-09-18 | Minolta Co Ltd | Reflecting characteristic measuring device |
| KR100794555B1 (en) * | 2006-08-10 | 2008-01-17 | 한국전기연구원 | Measurement system of a tissue's optical properties using multi-wavelength laser source and multi-wavelength laser source |
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| WO2024051037A1 (en) | 2024-03-14 |
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