Object photochromic method and device

Abstract

The invention relates to a photochromic method and a photochromic device for an object, and the photochromic method is used for carrying out light processing on all-black photochromic dye on the surface of the object, and comprises the following steps: separating a design pattern into monochromatic images of three channels of red, green and blue; tCyan, TMagenta and TYellow are obtained, and when light with the RGB values of (255, 0, 0), (0, 255, 0) and (0, 0, 255) irradiates the all-black photochromic dye, the time when the blue, the magenta and the yellow on the all-black photochromic dye are completely eliminated is TCyan, TMagenta and TYellow respectively, and when light with the RGB values of (255, 0, 0), (0, 255, 0) and (0, 0, 255) are irradiated on the all-black photochromic dye, the time when the blue, the magenta and the yellow on the all-black photochromic dye are completely eliminated is TCyan, TMagenta and TYellow; and projecting a single-color image of a red channel obtained by the S410 for Tcyan duration to the all-black photochromic dye, projecting a single-color image of a green channel obtained by the S410 for Tmagenta duration to the all-black photochromic dye, and projecting a single-color image of a blue channel obtained by the S410 for Tyellow duration to the all-black photochromic dye. Through the setting, the complexity of calculation is reduced, the time is saved, and the method can be conveniently operated on equipment with limited processing capacity.

Description

Technical Field

[0001] The present invention relates to the technical field of photochromic change, and in particular to a method and device for photochromic change of an object. Background Art

[0002] Color is an important element in expressing personality, emotion and brand identity, and it affects people's choice and preference for items. With the rise of the trend of personalized customization, consumers' demand for products that reflect personal style has increased, especially in color selection, covering industries such as clothing, automobiles, home furnishings and electronics. In order to meet people's demand for intelligent color change, thermochromism that changes color with temperature changes and electrochromism that changes color with electric field changes have become the two main technologies, but these technologies can usually only switch between two colors, cannot achieve full-color color change, and are difficult to accurately change color locally. Thermochromism requires continuous heating, and electrochromism requires continuous electricity, so the color change results are not stable enough, which limits their application and practicality.

[0003] Photo-Chromeleon, a full-color color-changing technology based on photochromic materials, has shown significant advantages. This technology uses the absorption spectrum characteristics of photochromic dyes (with magenta, cyan and yellow as the base colors) to control the color reaction of each dye through red, green and blue light (RGB light source) to achieve precise color mixing. The color change of photochromic dyes is reversible, and the color can be restored to the original state through special ultraviolet light irradiation, allowing the color of the surface of the object to be customized repeatedly, which is flexible and accurate, and provides new possibilities for personalized design.

[0004] However, Photo-Chromeleon technology uses an optimization algorithm to accurately calculate and control the irradiation time of RGB light at each pixel point to achieve an effect close to the target color. To this end, it is necessary to conduct detailed experimental analysis on the different photochromic dyes used, and the illumination data of the photochromic dyes needs to be collected in advance and stored in the computer. When the user inputs a pattern, the computer will analyze the color of each pixel, calculate the optimal irradiation plan of RGB light, and then integrate it into an overall dynamic pattern change signal. Finally, the whole process of light irradiation is completed through the projector. The calculation is large and time-consuming. It takes 10 to 20 minutes to achieve the color change of only one side of the object; and updating the pattern requires recalculating the entire processing program, which has a high time cost and a large processing burden on the computer side. It has high requirements for computer processing power and is difficult to run on devices such as mobile phones or single-chip microcomputers with limited processing power, which limits the portability and lightweight application of the technology. Summary of the invention

[0005] In order to solve the above-mentioned defects, the present invention provides a method and device for photochromic change of an object.

[0006] The technical solution adopted by the present invention is a method for photochromic change of an object, comprising the following steps:

[0007] S100, obtaining a photochromic dye;

[0008] S200, applying the photochromic dye to the surface of an object;

[0009] S300, initializing the photochromic dye on the surface of the object to be completely black;

[0010] S400, performing light treatment on the all-black photochromic dye on the surface of the object using a light treatment method to generate a color change result;

[0011] The S400, using a light treatment method to perform light treatment on the all-black photochromic dye on the surface of the object, specifically comprises the following steps:

[0012] S410, separating the design pattern into monochrome images of three channels: red, green and blue;

[0013] S420, obtain T Cyan , T Magenta and T Yellow , the T Cyan , T Magenta and T Yellow The definition is as follows: Based on the RGB color model with a value range of 0-255, when light with RGB values ​​of (255, 0, 0), (0, 255, 0) and (0, 0, 255) is irradiated on the all-black photochromic dye, the time when the magenta, red and yellow on the all-black photochromic dye are completely eliminated is T Cyan , T Magenta and T Yellow ;

[0014] S430, Projection T cyan The monochromatic image of the red channel obtained in S410 is projected onto the all-black photochromic dye, and T magenta The green channel monochrome image obtained in S410 is projected onto the all-black photochromic dye, and T yellow The monochrome image of the blue channel obtained in S410 is transferred onto the all-black photochromic dye.

[0015] Preferably, the S420 specifically includes the following steps:

[0016] selecting a target irradiation area on the all-black photochromic dye;

[0017] Irradiate the target irradiation area with lights having RGB values ​​of (255, 0, 0), (0, 255, 0) and (0, 0, 255);

[0018] When the magenta, yellow and blue in the target irradiation area are detected to be completely eliminated, the required time is recorded as T. Cyan , T Magenta and T Yellow .

[0019] Preferably, the size of the target irradiation area is 1 square millimeter to 25 square centimeters.

[0020] Preferably, the target irradiation area includes n areas,

[0021] Irradiate the n target irradiation areas with lights having RGB values ​​of (255, 0, 0), (0, 255, 0) and (0, 0, 255) respectively;

[0022] When the magenta, red, and yellow colors of each target irradiation area are detected to be completely eliminated, the required time is recorded as T. Cyan，1 , T Cyan，2 …T Cyan , and T Magenta，1 , T Magenta，2 …T Magenta，n , and T Yellow，1 , T Yellow，2 …T Yellow，n , using statistical methods according to T Cyan，1 , T Cyan，2 …T Cyan , and T Magenta，1 , T Magenta，2 …T Magenta，n , and T Yellow，1 , T Yellow，2 …T Yellow，n Get T Cyan , T Magenta and T Yellow .

[0023] Preferably, after step S400, the following steps are further included:

[0024] S500, determine whether a new color change result needs to be generated, if so, jump to step S300 and restart execution from step S300; if not, complete the color change.

[0025] Preferably, after step S400, the following steps are further included:

[0026] S500, judging whether the color change result is accurate, if so, completing the color change; if not, executing step S600, said S600 specifically includes the following steps:

[0027] S610, calculating a deviation pattern between the design pattern and the color change result;

[0028] S620, acquiring monochrome images and / or ultraviolet images of three channels of red, green and blue based on the deviation pattern;

[0029] S630 , projecting the monochrome images of the three channels of red, green and blue and / or the ultraviolet light image acquired in S620 onto the photochromic dye on the surface of the object processed in step S400 , to generate a corrected new color change result.

[0030] Preferably, the step S400, using a light treatment method to perform light treatment on the all-black photochromic dye on the surface of the object, specifically comprises the following steps:

[0031] S410, separating the design pattern into monochrome images of three channels: red, green and blue;

[0032] S420, obtain T Cyan , T Magenta and T Yellow , the T Cyan , T Magenta and T Yellow The definition is as follows: Based on the RGB color model with a value range of 0-255, when light with RGB values ​​of (255, 0, 0), (0, 255, 0) and (0, 0, 255) is irradiated on the all-black photochromic dye, the time when the magenta, red and yellow on the all-black photochromic dye are completely eliminated is T Cyan , T Magenta and T Yellow ;

[0033] S430, respectively calculate the brightness of the monochrome images of the three channels of red, green and blue obtained in S410 as T Cyan / T max , T Magenta / T max and T Yellow / T max The ratio of is reduced, and the optimized monochrome images of the red, green and blue channels are obtained. Define T Cyan , T Magenta and T Yellow The maximum value in is T max ;

[0034] S440, projecting the optimized monochromatic images of the three channels of red, green and blue obtained in S430 onto the all-black photochromic dye, and the projection time is T max .

[0035] The present invention also discloses a photochromic device for an object, based on the above-mentioned photochromic method for an object, comprising:

[0036] a photochromic dye application unit for applying the photochromic dye to the surface of the object;

[0037] a first light projection unit, which is used to project ultraviolet light to the photochromic dye on the surface of the object;

[0038] A monochrome image generating unit, which generates monochrome images of three channels of red, green and blue according to the designed pattern;

[0039] A second light projection unit, which is used to project monochrome images of three channels, red, green and blue, respectively, onto the photochromic dye on the surface of the object;

[0040] A control unit is used to obtain the time T at which the magenta, red and yellow on the photochromic dye on the surface of the object are completely eliminated. Cyan , T Magenta and T Yellow , and based on T Cyan , T Magenta and T Yellow , and the monochrome images of three channels of red, green and blue generated by the monochrome image generating unit, to control the projection of the second light projection unit.

[0041] Preferably, it also includes:

[0042] The detection unit is used to detect the time T when the magenta, red and yellow on the photochromic dye on the surface of the object are completely eliminated. Cyan , T Magenta and T Yellow , and T Cyan , T Magenta and T Yellow is delivered to the control unit.

[0043] Preferably, the system further comprises a time determination unit, wherein the time determination unit is used to determine T Cyan , T Magenta and T Yellow The maximum value T max ;

[0044] The control unit is based on T Cyan , T Magenta and T Yellow , T determined by the time determination unit max , and the monochrome images of three channels of red, green and blue generated by the monochrome image generating unit, to control the projection of the second light projection unit.

[0045] Compared with the prior art, the present invention has the following beneficial effects:

[0046] 1. According to the object photochromic method of the present invention, when processing the user's color design scheme, it is no longer necessary to analyze each pixel one by one on the computer side. The color change process only needs to consider the direct implementation of the light irradiation of the overall monochrome image in three different light channels of RGB. This method only needs to process the color image from a macroscopic perspective. Under the irradiation time of the three different light channels of R, G, and B, the color change result of the material is achieved by controlling the irradiation intensity of each pixel. The signal fed back to the digital projector is also an overall image signal, which does not require pixel-by-pixel analysis and control, greatly reducing the complexity of implementation, simplifying the calculation process and the process of implementing light irradiation, and greatly improving the processing speed of the computer side, saving time, reducing the complexity of calculation, and facilitating operation on devices with limited processing power, such as mobile phones or single-chip microcomputers, with enhanced portability and application potential, and a wider range of application scenarios. The idea of ​​switching from time control to light intensity control can simplify the light processing process of this technology from a macroscopic perspective and avoid cumbersome calculation burdens.

[0047] 2. In the present invention, the T of the target all-black photochromic dye is specifically measured. Cyan , T Magenta and T Yellow , so as to calibrate the three light projection irradiation times according to the different photochromic dyes on different objects in a targeted manner. The results obtained are based on the actual concentration, thickness and other conditions of the photochromic dyes on the actual objects. For example, a more accurate color change effect can be achieved. The color pixels finally obtained after light treatment are more consistent with the user's designed pattern, and the reliability of the color change result is higher.

[0048] 3. Based on the method proposed in the present invention, even if the formulation of the photochromic dye needs to be improved and adjusted in the later stage, there is no need to re-perform a large number of preliminary experiments and data collection. Since the light processing method of the present invention can automatically adjust the light irradiation parameters during the proofreading process, the overall irradiation process of the proposed RGB different light channels does not depend on the specific dye formulation. This enables the technology to respond more quickly to the adjustment of the dye formulation and the needs of new applications, which is conducive to the upgrading of the technical formulation, rapid iteration and more diversified applications. BRIEF DESCRIPTION OF THE DRAWINGS

[0049] The present invention is described in detail below with reference to the embodiments and accompanying drawings, wherein:

[0050] Figure 1 A flow chart of a method for photochromic change of an object;

[0051] Figure 2 is a flow chart of step S400 in one embodiment;

[0052] Figure 3A schematic diagram of mixing magenta, cyan and yellow photochromic dyes to obtain a desired photochromic dye;

[0053] Figure 4 A schematic diagram of applying a photochromic dye to a target object;

[0054] Figure 5 A schematic diagram of using ultraviolet light of a specific band to irradiate a target object so that its color is initialized to completely black;

[0055] Figure 6 A schematic diagram of irradiating red light, green light and blue light of the highest light intensity to a target object;

[0056] Figure 7 A schematic diagram for performing light processing on the initialized target object for a digital projector and generating a color change result that meets user requirements;

[0057] Figure 8 A schematic diagram of using ultraviolet light of a specific wavelength band to irradiate a target object so that its color is restored to a completely black state;

[0058] Fig. 9 A schematic diagram of a target object being subjected to light processing by a digital projector again and generating a new color change result;

[0059] Fig.10 A specific schematic diagram of importing the lion pattern required for the design from the computer and separating the pattern into a monochrome image of three RGB channels;

[0060] Fig.11 The decomposed red, green and blue light images act on the CMY channels of the material respectively, and project red, green and blue light images of different intensities in different time periods, so that the magenta, fuchsia and yellow photochromic dyes produce different color depth distributions on the corresponding channels, and finally generate a specific schematic description that meets the design goals after synthesis;

[0061] Fig.12 A schematic diagram of the actual color change result generated by the object photochromic method on a PVC card;

[0062] Fig.13 FIG. 6 is a flow chart of step 600 in one embodiment. DETAILED DESCRIPTION

[0063] In order to make the purpose, technical scheme and advantages of the present invention clearer, the embodiments of the present invention will be further described in detail below in conjunction with the accompanying drawings. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar components or components with the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be interpreted as limiting the present invention.

[0064] In one embodiment, Figure 1 As shown, a method for photochromic change of an object comprises the following steps:

[0065] S100, obtaining a photochromic dye.

[0066] Specifically, diarylethene compounds can be selected as the main material of the photochromic dye. The diarylethene photochromic dye has bright colors, good color stability, good light response, and good fatigue resistance to repeated color changes. Figure 3 As shown, a magenta photochromic dye 11, a magenta photochromic dye 12 and a yellow photochromic dye 13 are selected, and each color of the photochromic dye is uniformly mixed in a certain proportion to obtain the desired photochromic dye 10, ensuring that no impurities are introduced during the mixing process. The mixed dye is in a powder state, and additives can be added therein to improve its environmental stability and reliability. The dye can also be subjected to quality tests such as color testing, light response testing and environmental stability testing to ensure that the photochromic dye mixture meets the expected standards and effects.

[0067] S200, applying the photochromic dye to the surface of an object.

[0068] Specifically, the powdered photochromic dye 10 can first be converted into a form suitable for spraying. In specific operations, the powdered dye can be mixed with an appropriate solvent to form a uniform dye suspension. This suspension can be adjusted to a viscosity suitable for the spray gun 14 to ensure uniform distribution of the dye and maintenance of the optimal particle size during the spraying process. During spraying, a high-precision pneumatic or electric spray gun can be used to evenly spray the target object 15 under controlled environmental conditions. During the spraying process, the operator can control the movement speed and spraying distance of the spray gun to ensure that each part obtains sufficient dye coverage while avoiding unevenness caused by excessive aggregation. Figure 4 As shown, the color appearance of the target object 15 after spraying is unchanged. After the thin film spraying is completed, a series of post-processing steps can usually be carried out, such as applying a transparent protective coating to enhance the wear resistance and environmental resistance of the finished product.

[0069] For fabric or textile objects, dyes can also be applied by dipping the object into a solution containing the dye, ensuring that each fiber is fully absorbed by the dye.

[0070] In addition, dyeing of some fine patterns can be achieved through screen printing or digital inkjet technology, which allows dyes to be applied precisely in specific areas to form complex designs or patterns that can produce color changes.

[0071] S300, initializing the photochromic dye on the surface of the object to be completely black.

[0072] Specifically, when the photochromic dye is coated on an object, Figure 5 As shown, it is necessary to use ultraviolet light of a special wavelength band of the ultraviolet light source 16 to irradiate the photochromic dye on the surface of the target object 15 so that the color of the photochromic dye on the surface of the target object 15 completely reaches a black saturated state.

[0073] In physical color theory, all color images can be separated through the CMY three-color channels (cyan, magenta, and yellow) to obtain three monochrome images with different color depth distributions. According to reverse thinking, if three images of cyan, magenta, and yellow with specific color depth distributions can be created on a physical medium, a full-color image can be synthesized by superimposing these three images. This process is essentially a process of restoring the color of the original image through color mixing theory. The material used in Photo-Chromeleon technology is essentially a mixture of cyan, magenta, and yellow photochromic materials. After being exposed to ultraviolet light of a special band, these three primary colors will reach a saturated state, making the mixed dye a state close to black. At this time, this completely black material can be regarded as the basic base map formed by the superposition of the three CMY colors that are fully saturated.

[0074] S400, using a light treatment method to perform light treatment on the all-black photochromic dye on the surface of the object to generate a color change result.

[0075] The S400, using a light treatment method to perform light treatment on the all-black photochromic dye on the surface of the object, specifically comprises the following steps:

[0076] S410, separating the design pattern into monochrome images of three channels: red, green and blue.

[0077] According to the user's color pattern design, based on the RGB (red, green, blue) color model, the user's design pattern is separated into monochrome images with three channels of red, green and blue. The color intensity values ​​of different pixels on a monochrome image may be the same or different based on the original design pattern.

[0078] The separation process can be automated using computer image processing software or programming tools.

[0079] Specifically, in one embodiment, step S410 may include the following steps:

[0080] S411, read the color information of each pixel from the design pattern. In the RGB color model, the color of each pixel is composed of the intensity values ​​of three channels: red (R), green (G), and blue (B), and the intensity range is 0 to 255. For example, the color information of a pixel may be (R=120, G=200, B=255), which means that the red intensity of the pixel is 120, the green intensity is 200, and the blue intensity is 255.

[0081] S412, extract the information of the red, green and blue channels respectively, and process them independently to obtain three monochrome images, each of which contains only the intensity information of one color channel. For example, for a pixel with RGB value (120, 200, 255), the RGB value of the red channel after separation will become (120, 0, 0), indicating that the red intensity is 120 and the other color intensities are 0.

[0082] S420, obtain T Cyan , T Magenta and T Yellow , the T Cyan , T Magenta and T Yellow The definition is as follows: Based on the RGB color model with a value range of 0-255, when light with RGB values ​​of (255, 0, 0), (0, 255, 0) and (0, 0, 255) is irradiated on the all-black photochromic dye, the time when the magenta, red and yellow on the all-black photochromic dye are completely eliminated is T Cyan , T Magenta and T Yellow .

[0083] Among them, T Cyan , T Magenta and T Yellow The value can be obtained by consulting the data or measuring.

[0084] Specifically, in one embodiment, step S420 may include the following steps:

[0085] S421, selecting a target irradiation area on the all-black photochromic dye.

[0086] S422, irradiate the target irradiation area with light having RGB values ​​of (255, 0, 0), (0, 255, 0) and (0, 0, 255). The highest light intensity values ​​of red light, green light and blue light are based on defined standards, and different definitions have different values. In digital display or image processing, based on the RGB color model with a value range of 0-255, the highest light intensity values ​​of red light, green light and blue light are usually defined as 255. Figure 6As shown, a digital projector 17 can be used to sequentially irradiate red light, green light and blue light with the highest light intensity to the target irradiation area on the all-black photochromic dye on the target object 15.

[0087] S423, when the magenta, cyan and yellow colors in the target irradiation area are detected to be completely eliminated, the required time is recorded as T Cyan , T Magenta and T Yellow The magenta, yellow and blue colors of the target irradiation area are detected to be completely eliminated, which may specifically include: the target irradiation area is detected to reflect red light, green light and blue light with the highest light intensity, that is, when the light intensity of the red light, green light and blue light reaches 255, it indicates that the magenta, yellow and blue colors of the target irradiation area are completely eliminated, such as Figure 6 As shown, a micro color sensor 18 placed in the target irradiation area can be used for detection. In other embodiments, other detection means can be used to determine whether the magenta, red and yellow colors in the target irradiation area are completely eliminated, such as spectral analysis, optical density detection, etc.

[0088] When photochromic dyes are applied to the surface of an object, their concentration and thickness will vary. The same T Cyan , T Magenta and T Yellow , the color pixels finally obtained after light processing will be different from the user's designed pattern.

[0089] In the original light processing method of Photo-Chromeleon technology, the adverse effects of uncertain factors such as the concentration and thickness of the coating on the color change result when the material is sprayed on the actual object are not taken into account. The original scheme of this technology is to collect the color change curves of the three selected photochromic dyes under different wavelengths of light conditions through experiments in advance, and store these data in the computer. During the irradiation process, the optimization algorithm is implemented and the light is output only based on these pre-stored data. In the actual irradiation process, the irradiation time of each wavelength of light required for materials of different concentrations and thicknesses during their fading process will also be different, and their fading rate will change. Therefore, in the specific implementation of the original technology, there is a lack of calibration of light irradiation data for specific examples, which will also lead to the inability to achieve accurate target color change effects.

[0090] In this embodiment, the T Cyan , T Magenta and T Yellow, so as to calibrate the three light projection irradiation times according to the different photochromic dyes on different objects in a targeted manner. The results obtained are based on the actual concentration, thickness and other conditions of the photochromic dyes on the actual objects. For example, a more accurate color change effect can be achieved. The color pixels finally obtained after light treatment are more consistent with the user's designed pattern, and the reliability of the color change result is higher.

[0091] S430, Projection T cyan The monochromatic image of the red channel obtained in S410 is projected onto the all-black photochromic dye, and T magenta The green channel monochrome image obtained in S410 is projected onto the all-black photochromic dye, and T yellow The monochrome image of the blue channel obtained in S410 is transferred onto the all-black photochromic dye.

[0092] Specifically, let the total projection time of the red image be T cyan , then the red pixels with different brightness levels from 0 to 255 in the image will fade the corresponding magenta components in the corresponding proportion, and finally form an image composed of magenta pixels of different depths with the opposite contrast to the projected image in the magenta channel of the material;

[0093] Let the total projection time of the green image be T magenta , then the green pixels with brightness levels from 0 to 255 in the image will fade the corresponding magenta components in proportion, and finally form an image composed of magenta pixels of different depths with a contrast opposite to that of the projected image in the magenta channel of the material;

[0094] Let the total projection time of the blue image be T yellow , the blue pixels in the image with brightness levels from 0 to 255 will fade the corresponding yellow components in the corresponding proportion, and finally form an image composed of magenta pixels of different depths with a contrast opposite to that of the projected image in the yellow channel of the material.

[0095] It should be noted that magenta, yellow and magenta (CMY) are the three primary colors in physical materials, corresponding to the complementary colors of red, green and blue (RGB) in the spectrum. Magenta dye mainly absorbs the red light spectrum, but allows green and blue light to pass through. When red light is irradiated on the surface of a photochromic dye mixed with magenta, magenta and yellow, it will only act on the magenta dye therein to produce a color change reaction, but will not affect the magenta and yellow dyes; magenta dye absorbs the green light spectrum, but allows red and blue light to pass through. When green light is irradiated on the surface of a photochromic dye mixed with magenta, magenta and yellow, it will only act on the magenta dye therein to produce a color change reaction, but will not affect the magenta and yellow dyes; yellow dye absorbs blue light, but allows red and green light to pass through. The irradiation of blue light will cause the surface color of the yellow dye to change, but will not affect the magenta and magenta dyes.

[0096] As for light projection devices such as digital projectors 17, the color images projected by digital projectors are composed of numerous pixels, and the color of each pixel is different. In essence, it is formed by the superposition and combination of pixel projections of red, green, and blue (RGB) lights of different brightness. The brightness of each pixel has different levels, usually ranging from 0 to 255. This range represents 256 different changes in pixel brightness, where 0 represents complete black (no light output) and 255 represents the brightest light intensity output. The optical display principle of the projector allows the pixel light intensity to produce subtle gradients under these 256 levels. In this way, various pixels of different colors can be produced by superimposing and combining red, green, and blue (RGB) lights of different brightness.

[0097] Based on the light irradiation principle of the projector, taking red light as an example, assuming that within a specific time range, red light with an intensity of 255 levels can completely eliminate the magenta photochromic dye component in the mixed dye, since the light irradiation intensity is proportional to the fading speed of the photochromic material, within this specific time range, red light with different brightness from 0 to 255 levels is projected onto the color-saturated material, and after the irradiation ends, the magenta component will retain different color depths from 255 to 0. This principle is also applicable to the use of green light to act on magenta photochromic dyes, and the use of blue light to act on yellow photochromic dyes.

[0098] Specifically, within a pixel range of light irradiation, there is a black photochromic material whose color is fully saturated after ultraviolet light irradiation, and its CMY color depth is (255, 255, 255). cyan The blue component in the material can be completely eliminated within 10 seconds. During this time, after the intensity I red (0≤I red≤255), the color depth of the remaining magenta component in this pixel range in the material can be adjusted to 255–I red Similarly, if a green pixel with an intensity of 255 is magenta The internal energy can completely eliminate the magenta component in the material, then after the intensity I green (0≤I green ≤255), the color depth of the remaining magenta component in the area is 255–I green Similarly, if the blue light pixel with intensity 255 is at time T yellow The internal energy completely eliminates the yellow component, and the intensity is I blue (0≤I blue ≤255) after being illuminated by blue light pixels, the color depth of the remaining yellow component in the area is 255–I blue .

[0099] Based on the complementary relationship between the CMY color model and the RGB color model, the RGB color model generates color by emitting light, and the CMY color model generates color by absorbing light. C=255-R, M=255-G, Y=255-B. If the RGB color value of a pixel is (I red , I green , I blue ), then the color value under the CMY color model is (255-I red ,255-I green ,255-I blue ).

[0100] In summary, if we respectively cyan , T magenta , and T yellow During this time, the material is subjected to a brightness level of I red , I green , and I blue The red, green and blue light pixels can be irradiated by the light, and the CMY color values ​​(255-I red ,255-I green ,255-I blue ) color pixels, that is, a color pattern composed of cyan, magenta and yellow channels that matches the user's designed pattern, thereby achieving accurate reproduction of complex colors.

[0101] According to the original technical solution of Photo-Chromeleon, according to the design image imported by the user, it is necessary to calculate the irradiation time of RGB light of different wavelengths required for each pixel in the image one by one, and synthesize this control process into a dynamic image and import it into the projector to realize the process of dynamic light irradiation. This process is very cumbersome and the workload is huge. In the logic of the original Photo-Chromeleon technology, the color change result of the material is achieved by controlling the irradiation time of each pixel under the light intensity of R, G, and B pixels respectively locked. It only considers how to use the brightest light intensity of red, green, and blue (RGB) at each pixel point to process the photochromic material in this area, fix the light intensity values ​​of three different wavelengths, and then control the irradiation time of these three different color pixels to make the photochromic material in this area eliminate the magenta, magenta, and yellow components according to the design requirements, and finally achieve the expected color change result. This method only deals with the problem from a microscopic perspective, allowing the material to generate color changes in pixels. In addition to controlling the irradiation time of the three different wavelengths of RGB light within the pixel range, the digital light projector can also accurately adjust the irradiation intensity of these three different wavelengths of light at each pixel.

[0102] As can be seen from the above, if the light processing method for changing the color of the all-black photochromic dye in the above embodiment is used, when processing the user's color design scheme, it will no longer be necessary to analyze each pixel one by one on the computer side, and the color change process only needs to consider directly implementing the light irradiation of the overall monochrome image in three different light channels of RGB. The light processing method only needs to process the color image from a macroscopic perspective, and the color change result of the material is achieved by controlling the irradiation intensity of each pixel under the irradiation time of the three different light channels of R, G, and B. The signal fed back to the digital projector is also an overall image signal, and there is no need for pixel-by-pixel analysis and control, which greatly reduces the complexity of implementation, simplifies the calculation process and the process of implementing light irradiation, and greatly improves the processing speed of the computer side, saves time, reduces the complexity of calculation, and is easy to run on devices with limited processing power, such as mobile phones or single-chip microcomputers, with enhanced portability and application potential, and a wider range of application scenarios. The idea of ​​switching from time control to light intensity control can simplify the light processing process of this technology from a macroscopic perspective and avoid cumbersome calculation burdens.

[0103] That is, the all-black photochromic dye on the surface of the object is treated with light by the light treatment method described in steps S410, S420, and S430 to generate a color change result, such as Figure 7 As shown, the digital projector 17 performs light processing on the target object 15 initialized by ultraviolet light and generates a schematic diagram of a color change result that meets the user's needs.

[0104] Specifically, since red, green, and blue light of different wavelengths will only affect the corresponding magenta, yellow, and magenta components in the photochromic mixture, the light of different wavelengths and different intensity distributions can be used to eliminate a certain proportion of color depth in the magenta, magenta, and yellow image channels of the material according to a specific position and intensity sequence, so that different color depth distributions belonging to each channel can be created in the three channels of CMY. After superposition, a rich color image can be obtained on the overall material. Since this full-color image is synthesized through the precise regulation of the three color depth distributions of CMY, its color superposition effect will meet the user's design requirements.

[0105] In one embodiment, the size of the target irradiation area is 1 square millimeter to 25 square centimeters. By using a smaller target irradiation area, it can respond quickly to changes in light and save time. The small-sized target irradiation area also makes it easier for the detection device to more accurately detect that magenta, cyan, and yellow are completely eliminated. The obtained T Cyan , T Magenta and T Yellow More accurate and reliable. Further, the size of the target irradiation area can be 5mm×5mm to 20mm×20mm.

[0106] Shorten response time

[0107] In other embodiments, the step S420 may further specifically include the following steps:

[0108] S421, selecting n target irradiation areas on the all-black photochromic dye;

[0109] S422, irradiate the n target irradiation areas with lights having RGB values ​​of (255, 0, 0), (0, 255, 0) and (0, 0, 255) respectively;

[0110] S423, when the magenta, cyan and yellow colors in each target irradiation area are detected to be completely eliminated, the required time is recorded as T. Cyan，1 , T Cyan，2 …T Cyan , and T Magenta，1 , T Magenta，2 …T Magenta，n , and T Yellow，1 , T Yellow，2 …T Yellow，n , using statistical methods according to T Cyan，1 , T Cyan，2 …T Cyan , and T Magenta，1 , T Magenta，2 …T Magenta，n , and T Yellow，1, T Yellow，2 …T Yellow，n Get T Cyan , T Magenta and T Yellow .

[0111] Among them, n target irradiation areas can be selected within the color change range according to a predetermined resolution or step size. The light irradiation time is calibrated for each of the n target irradiation areas, and T is finally determined by recording the calibration time of light of different wavelengths in these areas and combining statistical methods (such as taking the average, weighted average, regression analysis, etc.). Cyan , T Magenta and T Yellow The method of this embodiment can effectively deal with the thickness, concentration differences or other surface unevenness of the material during the spraying process, and minimize the local deviation caused by single-area calibration, thereby improving the uniformity and accuracy of the overall color change effect.

[0112] Wherein, when step S420 in step S400 is implemented by steps S421, S422 and S423 in the above two embodiments, step S420 may be performed before step S300, so as to avoid affecting the all-black photochromic dye obtained in step S300.

[0113] In one embodiment, the monochrome images of the three channels of red, green and blue in S430 are projected onto the all-black photochromic dye, and the projection of the monochrome images of the three channels starts at the same time. Since each wavelength of red, green and blue light mainly affects the color depth of one channel among magenta, cyan and yellow, the irradiation process of red, green and blue light can be carried out simultaneously or sequentially, and will not significantly affect the color generation result. However, if the irradiation process of red, green and blue light is carried out simultaneously, the time can be greatly shortened, and the color change efficiency of the all-black photochromic dye can be improved.

[0114] In one embodiment, after step S400, the following steps are further included:

[0115] S500, determine whether a new color change result needs to be generated, if so, jump to step S300 and restart execution from step S300; if not, complete the color change.

[0116] Specifically, if the user needs to change the color again based on the color change pattern that has been completed, such as Figure 8As shown, the target object 15 that has changed color can be irradiated again with ultraviolet light of a special wavelength band of the ultraviolet light source 16, so that the magenta, fuchsia, and yellow dyes in the color-changing material are stimulated again, and the color depth reaches a saturated state, and the overall color of the material on the target object 15 will be restored to the original state of full black. At this time, the user inputs his new design pattern into the computer again, and the light processing method described in step S400 can be used again to change the color on the same object, and finally a new pattern different from the previous one is created on the same object, such as Fig. 9 As shown. Repeating this process can achieve repeated changes in the color of the same object. If the user does not need to change the color again, the photochromic change of the object is completed, and the user can use the object according to the current color change result.

[0117] The present invention significantly enhances the flexibility and adaptability of the original technology. Based on the new light processing method proposed by the present invention, even if the formulation of the photochromic dye needs to be improved and adjusted in the later stage, there is no need to re-perform a large number of preliminary experiments and data collection. Since the light processing method of the present invention can automatically adjust the light irradiation parameters during the proofreading process, the overall irradiation process of the proposed RGB different light channels does not depend on the specific dye formulation. This enables the technology to respond more quickly to the adjustment of the dye formulation and the needs of new applications, which is conducive to the upgrading of the technical formulation, rapid iteration and more diversified applications.

[0118] In one embodiment, after step S400, the following steps are further included:

[0119] S500, determine whether the color change result is accurate, if so, complete the color change; if not, execute step S600. A sensor, camera or other detection unit can be used to collect the surface image after the color change, and compare it with the expected design pattern. Step S600 is to compensate for the color change result, which is a correction process.

[0120] like Fig.13 As shown, the S600 specifically includes the following steps:

[0121] S610: Calculate a deviation pattern between the design pattern and the color change result. The deviation pattern reflects the color difference between the current color change effect and the expected design.

[0122] S620: Obtain a monochromatic image of three channels of red, green and blue and / or an ultraviolet image based on the deviation pattern. The ultraviolet image is used to supplement and deepen the color, and the monochromatic image of three channels of red, green and blue is used to continue to eliminate the color.

[0123] S630 , projecting the monochrome images of the three channels of red, green and blue and / or the ultraviolet light image acquired in S620 onto the photochromic dye on the surface of the object processed in step S400 , to generate a corrected new color change result.

[0124] Based on steps S500 and S600, it can be further ensured that the color change effect is highly consistent with the design pattern, which is suitable for scenarios requiring high-precision color change control, such as smart display, decoration, billboards or other industrial fields requiring color change effects.

[0125] In a more specific embodiment, the color change of the lion pattern is achieved on a pure white polyvinyl chloride (PVC) card using the object photochromic method. The specific steps are as follows:

[0126] Step 1: Obtain photochromic dyes. Material selection: Select diarylethenes as the main materials of photochromic dyes, including cyan, magenta and yellow photochromic dyes. Mix dyes: Mix the three dyes in a certain proportion to ensure uniform mixing, and add specific additives to improve their environmental stability and reliability. Finally, a black photochromic dye mixture is obtained.

[0127] Step 2: Apply the photochromic dye to the surface of the object, that is, apply the photochromic dye to the PVC card. Prepare the dye suspension: Mix the powdered photochromic dye with an appropriate solvent to form a uniform dye suspension. Spray the dye: Use a high-precision spray gun to evenly spray the dye suspension on the pure white PVC card to ensure that the dye evenly covers the surface of the card. After spraying, a layer of transparent protective coating can be applied to the surface of the card to enhance the finished product's resistance to wear and tear and resistance to environmental factors.

[0128] Step three, calibrate the projection time. Initialize the color: Use ultraviolet light of a special band to irradiate the PVC card sprayed with photochromic dye to make its color reach a saturated black state, providing a basis for calibrating the projection time. Use the aforementioned light treatment method to treat the all-black photochromic dye on the surface of the object to generate a color change result. Calibrate the projection time: Before the color change treatment, select a target area on the PVC card and install a micro color sensor. Project red, green, and blue light with an intensity of 255 in turn, and record the time it takes for each color to be completely eliminated (T Cyan , T Magenta , T Yellow ). Adjust light irradiation parameters: According to the data recorded by the color sensor, adjust the irradiation time of red, green and blue light to ensure accurate color change effect in actual operation.

[0129] Step 4: UV irradiation to make the dye reach the initial black state. That is, the PVC card sprayed with photochromic dye is irradiated with UV light of a special band again to make its color reach a saturated black state, providing a basis for subsequent color changes.

[0130] Step 5: Use a digital projector to project light. Design the pattern: Import the lion pattern required for design on the computer, and separate the pattern into three channels of RGB monochrome images, as shown in the following figure. Fig.10 Projection pattern: Use a digital projector to project the decomposed red, green, and blue light images onto the CMY channels of the material. Project red, green, and blue light images of different intensities at different time periods, so that the magenta, fuchsia, and yellow photochromic dyes produce different color depth distributions on the corresponding channels, as shown in the specific diagram. Fig.11 shown.

[0131] The red light image irradiation time is T Cyan , so that the magenta channel produces the residual color required for the color change result. The green light image irradiation time is T Magenta , so that the magenta channel produces the residual color required for the color change result. The blue light image irradiation time is T Yellow , so that the yellow channel produces the residual color required for the color change result. Generate color images: After the CMY three channels of the mixed photochromic dye have been irradiated by the three different light channels of RGB, the residual colors are synthesized to form a color image that meets the user's design requirements.

[0132] Fig.12 Shown are actual color change results on PVC cards, including:

[0133] In its initial state, the pure white PVC card has no color at all when not exposed to UV light.

[0134] Black saturation state: after being irradiated by ultraviolet light, the photochromic material on the card is fully excited to a black saturation state.

[0135] The generated color image is projected through a digital projector to project the three channels of RGB images respectively. Cyan , T Magenta , T Yellow Within the time, a lion pattern color-changing effect that meets design expectations is generated.

[0136] Further, if you need to erase and recreate the color, you can do the following steps:

[0137] Color erasing. If you need to change the pattern, you can jump back to step 4 and use ultraviolet light of a special band to irradiate the discolored PVC card to restore its color to its original black state.

[0138] Change color again, and repeat the process of step five according to the new design pattern to achieve a new color change effect again.

[0139] This example describes in detail the specific operation steps for achieving color change of the lion pattern on a PVC card, and proves the feasibility and practical application value of the method of the present invention.

[0140] In one embodiment, the overall brightness of the image of the channel with the fastest fading speed and the shortest required time among the three channels of red, green and blue monochrome images can be proportionally weakened to match the time of other channels, so as to reduce T Cyan , T Magenta and T Yellow The irradiation time of the three channels is unified into a longer time range. Therefore, the light treatment method for changing the color of the all-black photochromic dye in this embodiment only needs to be operated according to a unified time parameter, and there is no need to adjust the time for each channel separately, which reduces the complexity of control, can better synchronize processing or simplify the control process, and the color change process is more convenient and smooth, which improves the user experience.

[0141] Specifically, the step S400, using a light treatment method to perform light treatment on the all-black photochromic dye on the surface of the object, specifically includes the following steps:

[0142] S410, separating the design pattern into monochrome images of three channels: red, green and blue;

[0143] S420, obtain T Cyan , T Magenta and T Yellow , the T Cyan , T Magenta and T Yellow The definition is as follows: Based on the RGB color model with a value range of 0-255, when light with RGB values ​​of (255, 0, 0), (0, 255, 0) and (0, 0, 255) is irradiated on the all-black photochromic dye, the time when the magenta, red and yellow on the all-black photochromic dye are completely eliminated is T Cyan , T Magenta and T Yellow ;

[0144] S430, respectively calculate the brightness of the monochrome images of the three channels of red, green and blue obtained in S410 as T Cyan / T max , T Magenta / T max and T Yellow / T max The ratio of is reduced, and the optimized monochrome images of the red, green and blue channels are obtained. Define T Cyan , TMagenta and T Yellow The maximum value in is T max ;

[0145] S440, projecting the optimized monochromatic images of the three channels of red, green and blue obtained in S430 onto the all-black photochromic dye, and the projection time is T max .

[0146] In other embodiments, the overall light irradiance intensity of the monochrome images of the three channels of red, green and blue may be enhanced proportionally, thereby shortening the color change time, accelerating the color change process and improving the overall color change efficiency.

[0147] In one embodiment, an object photochromic device, based on the object photochromic method described in the above embodiment, includes a photochromic dye application unit, a first light projection unit, a monochrome image generation unit, a second light projection unit and a control unit.

[0148] The photochromic dye application unit is used to apply the photochromic dye to the surface of the object. The photochromic dye application unit may include a spray gun loaded with mixed photochromic dye, an immersion tank, a printing device, etc. The first light projection unit is used to project ultraviolet light to the photochromic dye on the surface of the object. The first light projection unit may include ultraviolet lasers, ultraviolet LED light sources, etc., which can project ultraviolet light of a special band, so that the color of the mixed photochromic dye reaches full black. The monochrome image generation unit generates a monochrome image of three channels of red, green and blue according to the design pattern. The monochrome image generation unit may include image processing software or programming tools, etc. The second light projection unit is used to project monochrome images of three channels of red, green and blue to the photochromic dye on the surface of the object, respectively. The second light projection unit may include a digital projector, a laser projector, etc.

[0149] A control unit is used to obtain the time T at which the magenta, red and yellow on the photochromic dye on the surface of the object are completely eliminated. Cyan , T Magenta and T Yellow , and based on T Cyan , T Magenta and T Yellow , and the monochrome images of the three channels of red, green and blue generated by the monochrome image generating unit, to control the projection of the second light projection unit. The control unit may include a single chip microcomputer, a portable computer, etc.

[0150] The control unit controls the projection of the second light projection unit, which may be specifically: the control unit controls the second light projection unit to project T to the photochromic dye on the surface of the object respectively. cyanThe monochrome image of the red channel of the time duration, T magenta The green channel monochrome image of the duration, and T yellow A monochrome image of the blue channel with a duration of 1.

[0151] In other embodiments, based on the object photochromic method including steps S410-S440, the control unit controls the projection of the second light projection unit, which can be specifically: the control unit controls the second light projection unit to project the optimized monochrome images of the three channels of red, green and blue onto the all-black photochromic dye, and the projection time is T max The control unit in this embodiment only needs to control T max One time, reduced control and improved efficiency.

[0152] The object photochromic device in this embodiment is based on the object photochromic method described in the above embodiment, which greatly reduces the requirements on the processing capabilities of the monochrome image generating unit and the control unit. The volume of the monochrome image generating unit and the control unit can be reduced, making the object photochromic device more portable and lightweight, and easy to promote and apply.

[0153] In one embodiment, the object photochromic device further comprises: a detection unit for detecting the time T at which the magenta, cyan and yellow on the photochromic dye on the surface of the object are completely eliminated. Cyan , T Magenta and T Yellow , and T Cyan , T Magenta and T Yellow The detection unit may include a micro color sensor, an optical density sensor, etc.

[0154] Specifically, in order to accurately obtain the light projection duration of red, green and blue images of different colors required by the target object, a projection time calibration process is still required before the color-changing light processing. This process can help achieve more accurate color change on the target object using the object photochromic method.

[0155] Select a target irradiation area of ​​the photochromic material on the surface of the target object, and install a micro color sensor on this area. The device should be small enough to be easily attached to the surface of the target object and not affect the color change process of the object. Use a projector to project red light, green light, and blue light with a light intensity of 255 on the material in this area. Since the color sensor can detect the light intensity of a specific wavelength, it can be set to specifically sense the reflectivity changes of light wavelengths corresponding to magenta, magenta, and yellow (CMY). When three of the specific color components are completely eliminated in turn, the reflectance spectrum of the material will change differently. These three specific times T Cyan , T Magenta and T Yellow It can be recorded by the color sensor and fed back to the second light projection unit. After receiving this data, the second light projection unit will automatically adjust the light projection duration during the red, green and blue light irradiation process according to the time required for complete elimination of different CMY color components to ensure accurate color change effect on the target object.

[0156] In one embodiment, the object photochromic device further includes: a judgment unit, which terminates the work according to the instruction, or restarts the monochrome image generating unit, the control unit and the second light projection unit. If the user has obtained the desired color pattern, the judgment unit can terminate the work according to the user's instruction. If the user needs to change the color again based on the completed color change pattern, the judgment unit can restart the monochrome image generating unit, the control unit and the second light projection unit according to the user's instruction to generate a new color pattern. The judgment unit can restart the monochrome image generating unit, the control unit and the second light projection unit multiple times until the user obtains the desired color pattern, and the flexibility and adaptability are greatly improved.

[0157] In one embodiment, the object photochromic device further comprises a time determination unit, wherein the time determination unit is used to determine T Cyan , T Magenta and T Yellow The maximum value T max The control unit is based on T Cyan , T Magenta and T Yellow , T determined by the time determination unit max , and the monochrome images of the three channels of red, green and blue generated by the monochrome image generating unit, control the projection of the second light projection unit. The brightness of the monochrome images of the three channels of red, green and blue is respectively T Cyan / T max , T Magenta / T max and T Yellow / Tmax The ratio of the optimized red, green and blue channels is reduced to obtain the optimized monochrome images of the three channels, and the control unit can control the second light projection unit to project the optimized monochrome images of the three channels of red, green and blue onto the all-black photochromic dye, and the projection time is T max , reducing the complexity of control.

[0158] In the description of this specification, if the terms "embodiment one", "this embodiment", "in an embodiment" and the like appear, it means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in the invention or at least one embodiment or example of the invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example; moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in an appropriate manner.

[0159] In the description of this specification, the terms "connect", "install", "fix", "set", "have", etc. are all understood in a broad sense. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0160] In the description of this specification, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "comprises", "comprising" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, an element defined by the statement "comprising a ..." does not exclude the presence of other identical elements in the process, method, article or device including the element.

[0161] The above description of the embodiments is to facilitate ordinary technicians in the technical field to understand and apply the technology of this case. People familiar with the technology in this field can obviously easily make various modifications to these examples and apply the general principles described here to other embodiments without creative work. Therefore, this case is not limited to the above embodiments. Modifications to the following situations should all be within the scope of protection of this case: ① A new technical solution implemented based on the technical solution of the present invention and combined with existing common knowledge, the technical effect produced by the new technical solution does not exceed the technical effect of the present invention; ② The equivalent replacement of some features of the technical solution of the present invention by using known technology, the technical effect produced is the same as the technical effect of the present invention; ③ The technical solution of the present invention can be expanded, and the substantive content of the expanded technical solution does not exceed the technical solution of the present invention; ④ The equivalent transformation made by using the contents of the description and drawings of the present invention is directly or indirectly applied to other related technical fields.

Claims

1. A method for photochromic change of an object, characterized in that: The following steps are involved: S100, obtaining a photochromic dye; S200, applying the photochromic dye to the surface of an object; S300, initializing the photochromic dye on the surface of the object to be completely black; S400, performing light treatment on the all-black photochromic dye on the surface of the object using a light treatment method to generate a color change result; The S400, using a light treatment method to perform light treatment on the all-black photochromic dye on the surface of the object, specifically comprises the following steps: S410, separating the design pattern into monochrome images of three channels: red, green and blue; S420, obtain T Cyan 、T Magenta and T Yellow , the T Cyan 、T Magenta and T Yellow The definition is as follows: Based on the RGB color model with a value range of 0-255, when light with RGB values ​​of (255, 0, 0), (0, 255, 0) and (0, 0, 255) is irradiated on the all-black photochromic dye, the time when the magenta, red and yellow on the all-black photochromic dye are completely eliminated is T Cyan 、T Magenta and T Yellow ; S430, Projection T cyan The monochromatic image of the red channel obtained in S410 is projected onto the all-black photochromic dye, and T magenta The green channel monochrome image obtained in S410 is projected onto the all-black photochromic dye, and T yellow The monochrome image of the blue channel obtained in S410 is then transferred onto the all-black photochromic dye.

2. The method for photochromic change of an object according to claim 1, characterized in that: The S420 specifically includes the following steps: selecting a target irradiation area on the all-black photochromic dye; Irradiate the target irradiation area with lights having RGB values ​​of (255, 0, 0), (0, 255, 0) and (0, 0, 255); When the magenta, yellow and blue in the target irradiation area are detected to be completely eliminated, the required time is recorded as T. Cyan 、T Magenta and T Yellow .

3. The method for photochromic change of an object according to claim 2, characterized in that: The size of the target irradiation area is 1 square millimeter to 25 square centimeters.

4. The method for photochromic change of an object according to claim 3, characterized in that: The target irradiation area includes n areas, Irradiate the n target irradiation areas with lights having RGB values ​​of (255, 0, 0), (0, 255, 0) and (0, 0, 255) respectively; When the magenta, red, and yellow colors of each target irradiation area are detected to be completely eliminated, the required time is recorded as T. Cyan，1 、T Cyan，2 …T Cyan , and T Magenta，1 、T Magenta，2 …T Magenta，n , and T Yellow，1 、T Yellow，2 …T Yellow，n , using statistical methods according to T Cyan，1 、T Cyan，2 …T Cyan , and T Magenta，1 、T Magenta，2 …T Magenta，n , and T Yellow，1 、T Yellow，2 …T Yellow，n Get T Cyan 、T Magenta and T Yellow .

5. The method for photochromic change of an object according to any one of claims 1 to 4, characterized in that: After step S400, the following steps are also included: S500, determine whether a new color change result needs to be generated, if so, jump to step S300 and restart execution from step S300; if not, complete the color change.

6. The method for photochromic change of an object according to any one of claims 1 to 4, characterized in that: After step S400, the following steps are also included: S500, judging whether the color change result is accurate, if so, completing the color change; if not, executing step S600, said S600 specifically includes the following steps: S610, calculating a deviation pattern between the design pattern and the color change result; S620, acquiring monochrome images and / or ultraviolet images of three channels of red, green and blue based on the deviation pattern; S630 , projecting the monochrome images of the three channels of red, green and blue and / or the ultraviolet light image acquired in S620 onto the photochromic dye on the surface of the object processed in step S400 , to generate a corrected new color change result.

7. The method for photochromic change of an object according to any one of claims 1 to 4, characterized in that: The S400, using a light treatment method to perform light treatment on the all-black photochromic dye on the surface of the object, specifically comprises the following steps: S410, separating the design pattern into monochrome images of three channels: red, green and blue; S420, obtain T Cyan 、T Magenta and T Yellow , the T Cyan 、T Magenta and T Yellow The definition is as follows: Based on the RGB color model with a value range of 0-255, when light with RGB values ​​of (255, 0, 0), (0, 255, 0) and (0, 0, 255) is irradiated on the all-black photochromic dye, the time when the magenta, red and yellow on the all-black photochromic dye are completely eliminated is T Cyan 、T Magenta and T Yellow ; S430, respectively calculate the brightness of the monochrome images of the three channels of red, green and blue obtained in S410 as T Cyan / T max 、T Magenta / T max and T Yellow / T max The ratio of is reduced, and the optimized monochrome images of the red, green and blue channels are obtained. Define T Cyan 、T Magenta and T Yellow The maximum value in is T max ; S440, projecting the optimized monochromatic images of the three channels of red, green and blue obtained in S430 onto the all-black photochromic dye, and the projection time is T max .

8. An object photochromic device, based on the object photochromic method according to any one of claims 1 to 7, characterized in that: include: a photochromic dye application unit for applying the photochromic dye to the surface of the object; a first light projection unit, which is used to project ultraviolet light to the photochromic dye on the surface of the object; A monochrome image generating unit, which generates monochrome images of three channels of red, green and blue according to the designed pattern; A second light projection unit, which is used to project monochrome images of three channels, red, green and blue, respectively, onto the photochromic dye on the surface of the object; A control unit is used to obtain the time T at which the magenta, red and yellow on the photochromic dye on the surface of the object are completely eliminated. Cyan 、T Magenta and T Yellow , and based on T Cyan 、T Magenta and T Yellow , and the monochrome images of three channels of red, green and blue generated by the monochrome image generating unit, to control the projection of the second light projection unit.

9. The object photochromic device according to claim 8, characterized in that: Also includes: The detection unit is used to detect the time T when the magenta, red and yellow on the photochromic dye on the surface of the object are completely eliminated. Cyan 、T Magenta and T Yellow , and T Cyan 、T Magenta and T Yellow is delivered to the control unit.

10. The object photochromic device according to claim 8, characterized in that: The time determination unit is used to determine T Cyan 、T Magenta and T Yellow The maximum value T max ; The control unit is based on T Cyan 、T Magenta and T Yellow , T determined by the time determination unit max , and the monochrome images of three channels of red, green and blue generated by the monochrome image generating unit, to control the projection of the second light projection unit.

Images