TW202309734A - Color detection calibration method and color detection device - Google Patents

Abstract

A color detection calibration method and a color detection device are disclosed. The method includes: in a calibration mode, emitting a color detection light to a reflective surface by a light emitter of the color detection device; receiving the color detection light reflected from the reflective surface by a light receiver of the color detection device; measuring a first color parameter of the color detection light reflected from the reflective surface; and updating a color detection parameter according to the first color parameter to reflect a light attenuation status of the color detection light.

Description

Color picking calibration method and color picking device

The present invention relates to a color picking and calibration technology, and in particular to a color picking and calibration method and a color picking device.

Some types of notebook computers may additionally install a color sensor in order to detect the display condition of the screen, and use the color sensor to detect the display condition of the screen (such as color difference) and correct it. However, when the color-picking light source used by the color sensor suffers from color fading due to long-term use, errors will also occur in the color-picking results of the color sensor for the screen based on the color-picking light source, thereby reducing the color The object color pick-up quality of the sensor.

The invention provides a color-picking correction method and a color-picking device, which can dynamically adjust color-picking parameters corresponding to the light attenuation state of a color-picking light source, thereby improving the color-picking quality of an object.

An embodiment of the present invention provides a method for calibrating a color picking device, which is used for calibrating a color picking device. The color-picking correction method includes: in the calibration mode, the light emitter of the color-picking device emits a color-picking light source toward the reflective surface; the light receiver of the color-picking device receives the light reflected by the reflective surface The color-picking light source; measuring a first color parameter of the color-picking light source reflected by the reflective surface; and updating the color-picking parameter according to the first color parameter to reflect the light attenuation state of the color-picking light source.

An embodiment of the invention further provides a color picking device, which includes a reflective surface, a light emitter, a light receiver, and a calibration controller. The calibration controller is coupled to the light emitter and the calibration controller. In the calibration mode, the light transmitter transmits the color-picking light source toward the reflective surface, the light receiver receives the color-picking light source reflected by the reflective surface, and the calibration controller measures the color-picking light source reflected by the reflective surface. The first color parameter of the color-picking light source reflected by the surface, and the correction controller updates the color-picking parameter according to the first color parameter to reflect the light attenuation state of the color-picking light source.

Based on the above, in the calibration mode, the light emitter of the color picking device can emit the color picking light source toward the reflective surface, and the light receiver of the color picking device can receive the color picking light source reflected by the reflecting surface. After measuring the first color parameter of the color-picking light source reflected by the reflective surface, the color-picking parameter can be updated according to the first color parameter to reflect the light attenuation state of the color-picking light source. Thereby, the quality of subsequent object color picking can be effectively improved.

FIG. 1 is a schematic diagram of a color picking device according to an embodiment of the present invention. Please refer to FIG. 1 , the color picking device 10 includes a light transmitter 11 , a light receiver 12 , a storage circuit 13 and a calibration controller 14 . The light emitter 11 is used to emit light. The light source emitted by the light emitter 11 can be visible light (such as white light) or invisible light (such as infrared light). In particular, the light source emitted by the light emitter 11 (also referred to as a color-picking light source) is used for color-picking the object. In one embodiment, performing color picking on the target is also referred to as performing color detection on the target. The light receiver 12 is used for receiving the light source. For example, the light receiver 12 can be an ambient light sensor or a color sensor.

The storage circuit 13 is used for storing data. The storage circuit 13 may include a volatile storage circuit and a non-volatile storage circuit. The volatile storage circuit is used for volatile storage of data. For example, the volatile storage circuit may include random access memory (Random Access Memory, RAM) or similar volatile storage media. The non-volatile storage circuit is used for non-volatile storage of data. For example, the non-volatile storage circuit may include a read-only memory (Read Only Memory, ROM), a solid state disk (solid state disk, SSD) and/or a traditional hard disk (Hard disk drive, HDD) or similar non-volatile Storage media.

The calibration controller 14 is coupled to the light transmitter 11 , the light receiver 12 and the storage circuit 13 . The calibration controller 14 is responsible for the overall or partial operation of the color picking device 10 . For example, the calibration controller 14 may include a central processing unit (CPU) or other programmable general-purpose or special-purpose microprocessors, digital signal processors (Digital Signal Processor, DSP), programmable controllers, special Application Specific Integrated Circuits (ASIC), Programmable Logic Device (Programmable Logic Device, PLD) or other similar devices or a combination of these devices.

In one embodiment, the color selection parameter 101 is stored in the storage circuit 13 . When the light source emitted by the light transmitter 11 (ie, the color light source) decays (eg, color fading), the calibration controller 14 can activate the calibration mode. In the calibration mode, the calibration controller 14 can perform color selection calibration on the color selection device 10 based on the degraded color selection light source. For example, in the color selection calibration, the calibration controller 14 can update the color selection parameter 101 . Afterwards, in the color picking mode, the calibration controller 14 can generate a more correct color picking result for the target object based on the degraded color picking light source and the updated color picking parameters 101 .

FIG. 2 is a schematic diagram of a calibration mode according to an embodiment of the present invention. Please refer to FIG. 1 and FIG. 2 , the light emitter 11 and the light receiver 12 can be disposed in parallel on the substrate 22 of the color picking device 10 . The reflective surface 21 is movably disposed above the light emitter 11 and the light receiver 12 . In the calibration mode, the light emitter 11 can emit the color-picking light source 201 toward the upper reflective surface 21 . The color-picking light source 201 can be reflected back by the reflective surface 21 . The light receiver 12 can receive the color-picking light source 202 reflected by the reflective surface 21 . The calibration controller 14 can measure the color parameter (also referred to as the first color parameter) of the color acquisition light source 202 reflected by the reflective surface 21 . The calibration controller 14 can update the color selection parameter 101 according to the first color parameter to reflect the light attenuation state of the color selection light source 201 .

FIG. 3 is a schematic diagram of a color picking mode according to an embodiment of the present invention. Referring to FIG. 1 and FIG. 3 , after updating the color-picking parameter 101 , in the color-picking mode, the calibration controller 14 can instruct the light emitter 11 to emit the color-picking light source 301 toward the object under test 31 above. The color-picking light source 301 may be the same as or similar to the color-picking light source 201 . For example, the light attenuation state of the color-picking light source 301 may be the same or similar to the light attenuation state of the color-picking light source 201 . The color-picking light source 301 can be reflected back by the object under test 31 . The light receiver 12 can receive the color-picking light source 302 reflected by the object under test 31 . The calibration controller 14 can measure the color parameter (also referred to as the second color parameter) of the color acquisition light source 302 reflected by the object 31 . The calibration controller 14 can obtain color evaluation information of the object under test 31 according to the second color parameter and the updated color selection parameter 101 . For example, the color evaluation information can reflect the color selection result of the object under test 31 (ie the color of the object under test 31 ). In other words, even if the color-picking light source emitted by the light transmitter 11 suffers from color fading and other degradations, by dynamically updating the color-picking parameters 101 , the subsequent color-picking accuracy of the object under test 31 can still be improved or maintained.

In an embodiment, both the first color parameter and the second color parameter are represented by XYZ color space values standardized by the International Commission on Illumination (CIE). In addition, the color evaluation information is represented by RGB color space values regulated by the International Commission on Illumination (CIE).

In one embodiment, the color selection parameters 101 are recorded in a color space conversion matrix. The color space conversion matrix is used to perform conversion between the XYZ color space value and the RGB color space value.

In an embodiment, the operation of the correction controller 14 to update the color selection parameter 101 according to the first color parameter includes updating the color space conversion matrix according to the first color parameter, so as to change the light attenuation state of the color selection light source to reflected in the color space conversion matrix. Then, in the color picking mode, the updated color space conversion matrix can be used to more accurately generate the color picking result of the object under test 31 (ie, the color evaluation information of the object under test 31 ).

In an embodiment, the calibration controller 14 can update the color space transformation matrix according to the following equations (1.1) to (1.3).

(1.1 ) [A]=

(1.1 )

(1.2)

(1.2)

(1.3) [M]=

(1.3)

In equations (1.1) to (1.3), matrix A represents the first color parameter, matrix M represents the color space conversion matrix, and parameters Xr, Xg, Xb, Yr, Yg, Yb, Zr, Zg and Zb are preset values . The parameters Sr, Sg and Sb are variable parameters that can reflect the light attenuation state of the color picker light source. According to the first color parameter, the color space conversion matrix (ie, the matrix M) can be updated (for example, at least one of the parameters Sr, Sg, and Sb) to reflect the light attenuation state of the color-picking light source.

In one embodiment, the calibration controller 14 can generate color evaluation information of the object under test according to the following equations (2.1) and (2.2).

(2.1)

(2.1)

(2.2) [C]=

(2.2)

In the equations (2.1) and (2.2), the matrix B represents the second color parameter, and the matrix C represents the color evaluation information of the DUT. According to the second color parameter and the updated color space conversion matrix (ie, matrix M), color evaluation information (ie, matrix C) of the object under test can be obtained. In particular, since the light attenuation state of the color-picking light source has been reflected in the color space conversion matrix, even if the color-picking light source decays, the obtained color evaluation information of the object under test can still reflect the object under test more accurately. true color.

In an embodiment, the reflective surface for reflecting the color-picking light source can be moved corresponding to different operation modes. For example, in the calibration mode, the reflective surface can be moved above the light sensor 11 and the light receiver 12 to reflect the color-picking light source. In addition, in the color picking mode, the reflective surface can be moved away from above the light sensor 11 and the light receiver 12 to avoid covering the object under test.

4 and 5 are schematic diagrams of a movable reflective surface according to an embodiment of the present invention. Please refer to FIG. 4 , before entering the calibration mode or in the color picking mode, the reflective surface 21 can be located at the standby position 401 . In the standby position 401, the reflective surface 21 cannot reflect the color-picking light source. At this time, the operation shown in FIG. 3 can be performed to detect the color of the object under test 31 . Referring to FIG. 5 , after entering the calibration mode, the reflection surface 21 can be manually or automatically moved to the reflection position 402 above the light sensor 11 and the light receiver 12 . At the reflecting position 402, the reflecting surface 21 can be used to reflect the color-picking light source.

FIG. 6 is a schematic diagram of a color picking device according to an embodiment of the present invention. Please refer to FIG. 6 , in an embodiment, the color picking device 10 further includes a mobile controller 61 . The movement controller 61 is coupled to the correction controller 14 and the reflective surface 21 . The movement controller 61 may include a driving controller and a driving motor. The movement controller 61 can control the movement of the reflective surface 21 in different operation modes according to the instructions of the calibration controller 14 . For example, in the calibration mode, the mobile controller 61 can control the reflective surface 21 to move to a reflective position in front of the light emitter 11 and the light receiver 12 (such as the reflective position 402 in FIG. 5 ) to reflect the color-picking light source. In addition, in the color picking mode, the movement controller 61 can control the reflective surface 21 to move away from the reflective position, for example, to move to the standby position 401 in FIG. 4 .

In one embodiment, the calibration controller 14 can detect whether the reflective surface 21 has moved to a reflective position in front of the light emitter 11 and the light receiver 12 (such as the reflective position 402 in FIG. 5 ). If the reflective surface 21 has moved to the reflective position in front of the light emitter 11 and the light receiver 12 , the calibration controller 14 can trigger the color picking device 10 to enter the calibration mode. On the contrary, if the reflective surface 21 has not moved to the reflective position in front of the light emitter 11 and the light receiver 12 , the calibration controller 14 may not be activated temporarily or enter the calibration mode.

In one embodiment, the color picking device 10 can be implemented in a notebook computer. For example, the light transmitter 11 and the light receiver 12 can be disposed in a receiving slot near the keyboard and/or the touchpad of the notebook computer. In one embodiment, the reflective surface 21 can be combined with the movable upper cover of the accommodating tank. In addition, in an embodiment, the reflective surface 21 can be disposed near the display of the notebook computer.

FIG. 7 is a schematic diagram of the appearance of a color picking device according to an embodiment of the present invention. Please refer to FIG. 7 , in one embodiment, the color picking device 10 can be implemented in a notebook computer 70 . The notebook computer 70 includes an upper body structure 71 and a lower body structure 72 . The upper body structure 71 is provided with a display 73 . The lower body structure 72 is provided with a keyboard 74 . The upper main body structure 71 and the lower main body structure 72 are connected through a physical hinge and can be rotated in relative directions (for example, open and close) through the physical hinge.

In one embodiment, the upper body structure 71 is configured with the reflective surface 21 , and the lower body structure 72 is configured with the light emitter 11 and the light receiver 12 . When the upper body structure 71 and the lower body structure 72 are not rotated to the closed position of the notebook computer 70, the reflective surface 21 is not located at the reflection position in front of the light emitter 11 and the light receiver 12, and cannot reflect the color-picking light source. As shown in Figure 7. In addition, when the upper main body structure 71 and the lower main body structure 72 are rotated to the closed position of the notebook computer 70, the reflective surface 21 can be located at the reflective position in front of the light emitter 11 and the light receiver 12 (for example, the reflective surface 21 can face the light transmitter 11 and optical receiver 12). At this time, the reflective surface 21 can reflect the color-picking light source emitted by the light transmitter 11 to the light receiver 12 .

In one embodiment, the calibration controller 14 can determine whether the reflective surface 21 has moved to the front of the light emitter 11 and the light receiver 12 by detecting the relative position between the upper body structure 71 and the lower body structure 72. reflective position. For example, the calibration controller 14 can detect the relative position between the upper main structure 71 and the lower main structure 72 according to the magnetic sensors respectively disposed on the upper main structure 71 and the lower main structure 72 . When the upper main structure 71 and the lower main structure 72 are rotated to the closed position of the notebook computer 70 , the magnetic sensor can generate a sensing value meeting a predetermined condition. The calibration controller 14 can determine that the reflective surface 21 has moved to the reflective position in front of the light emitter 11 and the light receiver 12 according to the sensing value and allow to start the calibration mode. On the contrary, when the upper main structure 71 and the lower main structure 72 are not rotated to the closed position of the notebook computer 70, the magnetic sensor will not be able to generate a sensing value that meets the preset condition. At this point, the calibration controller 14 may determine that the reflective surface 21 has not moved to the reflective position in front of the light emitter 11 and the light receiver 12 and the calibration mode is not allowed to be activated.

In an embodiment, the color picking device 10 can also be implemented in other types of electronic devices. For example, the color picking device 10 can also be implemented in a tablet computer, a desktop computer, or various electronic devices dedicated to performing object color picking, and the present invention is not limited thereto.

FIG. 8 is a flow chart of a color picking and calibrating method according to an embodiment of the present invention. Please refer to FIG. 8 , in step S801 , in the calibration mode, the light emitter of the color-picking device emits a color-picking light source toward the reflective surface. In step S802, the light receiver of the color picking device receives the color picking light source reflected by the reflecting surface. In step S803, measure a first color parameter of the color-picking light source reflected by the reflective surface. In step S804, the color selection parameter is updated according to the first color parameter to reflect the light attenuation state of the color selection light source.

FIG. 9 is a flow chart of a color picking and calibrating method according to an embodiment of the present invention. Please refer to FIG. 9 , in step S901 , a light emitter emits a color-picking light source toward the object under test. In step S902, a light receiver receives a color-picking light source reflected by the object under test. In step S903, measure a second color parameter of the color-picking light source reflected by the object to be tested. In step S904, the color evaluation information of the object under test is obtained according to the second color parameter and the updated color selection parameter.

FIG. 10 is a flow chart of a color picking and calibrating method according to an embodiment of the present invention. Referring to FIG. 10, in step S1001, system initialization is performed. The system initialization may include any initialization operation before performing the color selection calibration, which is not limited by the present invention. In step S1002, it is determined whether the reflective surface has moved to the reflective position in front of the light emitter and the light receiver. If the reflective surface has moved to the reflective position in front of the light emitter and the light receiver, in step S1003, enter the calibration mode and perform color-picking calibration. In step S1004, it is determined whether a preset time (for example, 15 days or 30 days, etc.) has passed since entering the calibration mode last time. If the preset time has passed since entering the calibration mode last time, in step S1005, the color selection parameter is updated according to the execution result of the color selection calibration. In addition, if the determination is negative in step S1002, then in step S1006, enter the color picking mode.

It should be noted that, in one embodiment, the operation of color selection and calibration can also be performed in step S1005. In addition, the operation details of the color-picking calibration and the updating of the color-picking parameters have been described in detail above, and will not be repeated here.

However, each step in FIG. 8 to FIG. 10 has been described in detail above, and will not be repeated here. It should be noted that each step in FIG. 8 to FIG. 10 can be implemented as a plurality of program codes or circuits, which is not limited by the present invention. In addition, the methods in FIG. 8 to FIG. 10 can be used together with the above exemplary embodiments, or can be used alone, which is not limited by the present invention.

To sum up, the embodiments of the present invention can dynamically adjust the color selection parameters corresponding to the light attenuation state of the color selection light source. Thereby, the color-picking quality of the object after the color-picking light source decays can be effectively improved.

Although the present invention has been disclosed above with the embodiments, it is not intended to limit the present invention. Anyone with ordinary knowledge in the technical field may make some changes and modifications without departing from the spirit and scope of the present invention. The scope of protection of the present invention should be defined by the scope of the appended patent application.

10: Color picking device 11: Optical transmitter 12: Optical receiver 13: storage circuit 14: Correction controller 101: Color picking parameters 21: reflective surface 201, 301: Color picking light source 202, 302: Color pick-up light source reflected by reflective surface 22: Substrate 31: The object to be tested 401: standby position 402: reflection position 61:Mobile Controller 70: Notebook computer 71: Upper main body structure 72: Lower main structure 73: display 74: keyboard S801~S804, S901~S904, S1001~S1006: steps

FIG. 1 is a schematic diagram of a color picking device according to an embodiment of the present invention. FIG. 2 is a schematic diagram of a calibration mode according to an embodiment of the present invention. FIG. 3 is a schematic diagram of a color picking mode according to an embodiment of the present invention. 4 and 5 are schematic diagrams of a movable reflective surface according to an embodiment of the present invention. FIG. 6 is a schematic diagram of a color picking device according to an embodiment of the present invention. FIG. 7 is a schematic diagram of the appearance of a color picking device according to an embodiment of the present invention. FIG. 8 is a flow chart of a color picking and calibrating method according to an embodiment of the present invention. FIG. 9 is a flow chart of a color picking and calibrating method according to an embodiment of the present invention. FIG. 10 is a flow chart of a color picking and calibrating method according to an embodiment of the present invention.

S801~S804: steps

Claims (10)

A color-picking calibration method for calibrating a color-picking device, and the color-picking calibration method includes: In a calibration mode, a light emitter of the color-picking device emits a color-picking light source toward a reflective surface; The color-picking light source reflected by the reflective surface is received by a light receiver of the color-picking device; measuring a first color parameter of the color light source reflected by the reflective surface; and A color selection parameter is updated according to the first color parameter to reflect a light attenuation state of the color selection light source. The color correction method described in claim 1 further includes: After updating the color-picking parameter, in a color-picking mode, emit the color-picking light source toward an object under test from the light emitter; The light receiver receives the color-picking light source reflected by the object; measuring a second color parameter of the color light source reflected by the object; and A color evaluation information of the object under test is obtained according to the second color parameter and the updated color selection parameter. The color correction method as described in claim 2, wherein the first color parameter and the second color parameter are represented by XYZ color space values regulated by the International Commission on Illumination (CIE), and the color Evaluation information is expressed in RGB color space values regulated by the International Commission on Illumination (CIE). The color selection and correction method as described in claim 3, wherein the color selection parameters are recorded in a color space conversion matrix, and the color space conversion matrix is used to convert the XYZ color space value and the RGB color space value. The method for color selection and correction as described in Claim 4, wherein the step of updating the color selection parameters according to the first color parameters includes: The color space conversion matrix is updated according to the first color parameter, so as to reflect the light attenuation state of the color-picking light source into the color space conversion matrix. The color correction method described in claim 1 further includes: In the calibration mode, controlling the reflective surface to move to a reflective position in front of the light emitter and the light receiver to reflect the color-picking light source; and In a color picking mode, the reflective surface is controlled to move away from the reflective position. The color correction method described in claim 1 further includes: detecting whether the reflective surface has moved to a reflective position in front of the light emitter and the light receiver; and If the reflective surface has moved to the reflective position, the color picking device is triggered to enter the calibration mode. A color picking device, comprising: a reflective surface; a light emitter; an optical receiver; and a correction controller, coupled to the light emitter and the correction controller, Wherein in a calibration mode, the light transmitter emits a color-picking light source toward the reflective surface, the light receiver receives the color-picking light source reflected by the reflective surface, and the calibration controller measures the color-picked light source reflected by the reflective surface get a first color parameter of the color light source, and The calibration controller updates a color selection parameter according to the first color parameter to reflect a light attenuation state of the color selection light source. The color picking device according to claim 8, wherein after updating the color picking parameters, in a color picking mode, the light emitter emits the color picking light source toward an object under test, and the light receiver receives The color-picking light source reflected by the object, the calibration controller measures a second color parameter of the color-picking light source reflected by the object under test, and The calibration controller obtains a color evaluation information of the object under test according to the second color parameter and the updated color selection parameter. The color picking device as described in claim item 8, further comprising: a movement controller, used to control the movement of the reflective surface, Wherein in the calibration mode, the movement controller controls the reflective surface to move to a reflective position in front of the light emitter and the light receiver to reflect the color-picking light source, and In a color picking mode, the movement controller controls the reflective surface to move away from the reflective position.

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