Photochromic method and apparatus for objects

Abstract

The present invention relates to a photochromic method and apparatus for objects. Using a light treatment method to perform light treatment on an all-black photochromic dye on the surface of an object comprises: separating a design pattern into monochromatic images of red, green and blue channels; acquiring TCyan, TMagenta, and TYellow, wherein when light rays having RGB values of (255, 0, 0), (0, 255, 0), and (0, 0, 255) are separately irradiated on the all-black photochromic dye, durations when cyan, magenta, and yellow on the all-black photochromic dye are separately completely eliminated are TCyan, TMagenta, and TYellow; and projecting the monochromatic image of the red channel obtained in S410 onto the all-black photochromic dye for the duration Tcyan, projecting the monochromatic image of the green channel obtained in S410 onto the all-black photochromic dye for the duration Tmagenta, and projecting the monochromatic image of the blue channel obtained in S410 onto the all-black photochromic dye for the duration Tyellow. By means of the described arrangements, the present invention reduces the complexity of calculation, saves time, and facilitates running on devices having a limited processing capability.

Description

An object photochromic method and device TECHNICAL FIELD

[0001] The present application relates to the technical field of photochromic, in particular to an object photochromic method and device. BACKGROUND

[0002] Color is an important element to express personality, emotion and brand identity, which affects people's choice and love for the product. With the rise of the trend of personalized customization, consumers' demand for products reflecting personal style has grown, especially in color selection, covering the clothing, automobile, home and electronic product industries. In order to meet people's demand for intelligent color change, thermochromism that changes color with temperature change and electrochromism that changes color depending on electric field change have become two main technologies, but these technologies can 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 power, so the color change result is not stable enough, limiting its application and practicality.

[0003] A full-color color-changing technology based on photochromic materials, Photo-Photo-Chromeleon, shows significant advantages. This technology uses the absorption spectrum characteristics of photochromic dyes (with cyan, magenta and yellow as the primary colors) to control the color reaction of each dye by red, green and blue light (RGB light source) irradiation, to achieve accurate color mixing, and the color change of photochromic dyes is reversible, the color can be reduced to the initial state by special ultraviolet irradiation, allowing the surface of the object to be repeatedly customized in color, flexible and accurate, providing a new possibility for personalized design.

[0004] However, the 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. For this purpose, detailed experimental analysis of different photochromic dyes used is required, and the photochromic dye light data needs to be collected in advance and stored in the computer. When the user inputs a pattern, the computer analyzes the color of each pixel, calculates the optimal irradiation scheme of RGB light, integrates it into a whole dynamic pattern change signal, and finally completes the whole light irradiation process through a projector, which is time-consuming and computationally intensive, and it takes 10 to 20 minutes to realize color change on one side of the object; and updating the pattern requires re-computing the entire processing program, which is time-consuming and computationally intensive, and the computer's processing burden is heavy, requiring high processing capacity, and devices with limited processing capacity such as mobile phones or single-chip microcomputers are difficult to run, limiting the portability and lightweight application of the technology. SUMMARY

[0005] In order to solve the above-mentioned defects, the present application provides an object photochromic method and device.

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

[0007] S100, obtaining a photochromic dye;

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

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

[0010] S400, using a light processing method to process the full black photochromic dye on the surface of the object, to generate a color change result;

[0011] The S400, using a light processing method to process the full black photochromic dye on the surface of the object, specifically comprises the following steps:

[0012] S410, separating the design pattern into single-color images of three channels of red, green and blue;

[0013] S420, obtaining T Cyan , T Magenta and T Yellow , the T Cyan , T Magenta and T Yel l ow are defined as follows: based on the RGB color model with a numerical range of 0-255, when the light with RGB values of (255, 0, 0), (0, 255, 0) and (0, 0, 255) is respectively irradiated on the full black photochromic dye, the time when the sky blue, magenta and yellow on the full black photochromic dye are completely eliminated respectively is T Cyan , T Magenta and T Yellow ;

[0014] S430, projecting the single-color image of the red channel obtained in the S410 for T cyan onto the full black photochromic dye, projecting the single-color image of the green channel obtained in the S410 for T magenta onto the full black photochromic dye, and projecting the single-color image of the blue channel obtained in the S410 for T yellow onto the full black photochromic dye.

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

[0016] Selecting a target irradiation area on the full black photochromic dye;

[0017] irradiating light with RGB values (255, 0, 0), (0, 255, 0) and (0, 0, 255) on the target irradiation area respectively;

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

[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,

[0021] irradiating light with RGB values (255, 0, 0), (0, 255, 0) and (0, 0, 255) on the n target irradiation areas respectively;

[0022] When cyan, magenta and yellow of each of the target irradiation areas are respectively detected to be completely eliminated, the required time is recorded as T Cyan,1 , T Cyan,2 …T Cyan , T Magenta,1 , T Magenta,2 …T Magenta,n , T Yellow,1 , T Yellow ,2…T Yellow,n , T Cyan,1 , T Cyan，2 …T Cyan , T Magenta,1 , T Magenta，2 …T Magenta，n , T Yellow,1 , T Yellow,2 …T Yellow,n , T Cyan , T Magenta and TYellow .

[0023] Preferably, after step S400, the method further includes the following steps:

[0024] S500, judging whether a new color change result needs to be generated, if yes, jumping to step S300 and re-executing from step S300; if no, completing the color change.

[0025] Preferably, after step S400, the method further includes the following steps:

[0026] S500, judging whether the color change result is accurate, if yes, completing the color change; if no, executing step S600, and the S600 specifically includes the following steps:

[0027] S610. Calculate the deviation pattern between the design pattern and the color change result;

[0028] S620. Based on the deviation pattern, obtain monochrome images and / or ultraviolet images of the three channels: red, green, and blue.

[0029] S630: Project the monochrome images and / or ultraviolet images of the red, green and blue channels acquired in S620 onto the photochromic dye on the surface of the object after processing in step S400 to generate a new color-changing result after correction.

[0030] Preferably, step S400, which involves phototreating the all-black photochromic dye on the surface of an object using a light treatment method, specifically includes the following steps:

[0031] S410, Separate the design pattern into a monochrome image with three channels: red, green, and blue;

[0032] S420, Obtain T Cyan T Magenta and T Yellow The T Cyan T Magenta and T Yellow Defined as follows: Based on the RGB color model with a numerical range of 0-255, when light with RGB values ​​of (255, 0, 0), (0, 255, 0), and (0, 0, 255) is shone onto the all-black photochromic dye, the time it takes for the magenta, cyan, and yellow hues on the all-black photochromic dye to be completely eliminated is defined as T. Cyan T Magenta and T Yellow ;

[0033] S430, The brightness of the monochrome images of the red, green, and blue channels obtained in S410 is respectively expressed as T... Cyan / T max T Magenta / T max and T Yellow / T max The proportions are reduced to obtain an optimized monochrome image with red, green, and blue channels. T is defined as follows. Cyan、 T Magenta and T Yellow The maximum value in is T max ;

[0034] S440: Project the optimized monochrome images of the red, green, and blue channels obtained in S430 onto the all-black photochromic dye, with a projection time of T for each projection. max .

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

[0036] A photochromic dye application unit is used to apply photochromic dyes to the surface of an object;

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

[0038] A monochrome image generation unit generates monochrome images with three channels: red, green, and blue, based on a design pattern.

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

[0040] The control unit is used to obtain the time T during which the indigo, magenta, and yellow pigments on the photochromic dyes 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 The monochrome images of the red, green, and blue channels generated by the monochrome image generation unit control the projection of the second light projection unit.

[0041] Preferred options also include:

[0042] The detection unit is used to detect the time T during which the Cyan, Magenta, and Yellow pigments on the photochromic dye on the surface of the object are completely eliminated. Cyan T Magenta and T Yellow and T Cyan T Megenta and T Yellow It is then delivered to the control unit.

[0043] Preferably, it further includes a time determination unit, the time determination unit being used to determine T. Cyan T Magenta and T Yellow The maximum value T in max ;

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

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

[0046] 1. According to the object photochromic method in the present application, when processing the color design scheme of a user, the computer end does not need to analyze each pixel one by one, and the photochromic process only needs to consider directly implementing the photoirradiation of the overall monochromatic image in the RGB three different light channels. The method only needs to process the color image from a macroscopic perspective, and through controlling the irradiation intensity of each pixel, the photochromic result of the material is realized under the locking of the irradiation time of the R, G and B three different light channels. The signal fed back to the digital projector is also the overall image signal, without the need for pixel-by-pixel analysis and control, which greatly reduces the complexity of implementation, simplifies the calculation process and the process of implementing photoirradiation, and at the same time greatly improves the processing speed of the computer end, saves time, reduces the complexity of calculation, and is convenient for running on devices with limited processing capacity, such as mobile phones or single-chip microcomputers, thereby enhancing portability and application potential and making the application scenario more extensive. The idea of switching from time control to light intensity control can simplify the light processing process of the technology from a macroscopic perspective, and avoid the cumbersome calculation burden.

[0047] 2. In the present application, the T Cyan , T Magenta and T Yellow of the target full-black photochromic dye are measured, so that the three light projection irradiation times are calibrated according to different photochromic dyes on different objects, and the results obtained are based on the actual concentration, thickness and other conditions of the photochromic dye on the actual object. Therefore, more accurate photochromic effects can be realized, the color pixels obtained after light processing are more consistent with the user's design pattern, and the reliability of the photochromic result is higher.

[0048] 3. Based on the method proposed in the present application, even if the formula of the photochromic dye needs to be improved and adjusted later, a large amount of preliminary experiments and data collection do not need to be performed again. Since the light processing method of the present application can automatically adjust the photoirradiation parameters in the calibration process, the overall irradiation process of the RGB different light channels proposed does not depend on the specific dye formula. This makes the technology be able to respond to the adjustment of the dye formula and the demand of new applications more quickly, and is beneficial to the upgrading, rapid iteration and more diversified application of the technical formula. BRIEF DESCRIPTION OF DRAWINGS

[0049] The present application will be described in detail below in conjunction with the embodiments and the accompanying drawings, in which:

[0050] Fig. 1 is a flowchart of an object photochromic method;

[0051] Fig. 2 is a flowchart of step S400 in an embodiment;

[0052] Fig. 3 is a schematic diagram of mixing cyan, magenta and yellow photochromic dyes into a desired photochromic dye;

[0053] Fig. 4 is a schematic diagram of applying photochromic dyes to a target object;

[0054] Fig. 5 is a schematic diagram of irradiating a target object with specific waveband ultraviolet light to initialize the color of the target object to full black;

[0055] Fig. 6 is a schematic diagram of irradiating a target object with red, green and blue light at the highest light intensity;

[0056] Fig. 7 is a schematic diagram of a digital projector performing light processing on the initialized target object and generating a color change result that meets the user's needs;

[0057] Fig. 8 is a schematic diagram of irradiating a target object with specific waveband ultraviolet light to restore the color of the target object to full black again;

[0058] Fig. 9 is a schematic diagram of performing light processing on the target object again by a digital projector and generating a new color change result;

[0059] Fig. 10 is a specific schematic diagram of importing a lion pattern designed by a computer and separating the pattern into single-color images of RGB three channels;

[0060] Fig. 11 is a specific schematic diagram of applying red, green and blue light images to the CMY channels of the material respectively, projecting red, green and blue light images of different intensities at different time periods, and making cyan, magenta and yellow photochromic dyes produce different color depth distributions on the corresponding channels, so as to finally generate a design target;

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

[0062] Fig. 13 is a flowchart of step 600 in an embodiment. DETAILED DESCRIPTION

[0063] To make the purpose, technical solutions and advantages of the present application clearer, the embodiments of the present application will be further described in detail below with reference to the drawings. The examples of the embodiments are shown in the drawings, wherein the same or similar reference signs represent the same or similar parts or parts having the same or similar functions throughout. The embodiments described below with reference to the drawings are exemplary and are only used to explain the present application, but cannot be interpreted as a limitation on the present application.

[0064] In an embodiment, as shown in Fig. 1, an object photochromic method comprises the following steps:

[0065] S100, obtaining photochromic dyes.

[0066] Specifically, a diarylethene compound can be selected as the main material of the photochromic dye, which has bright color, good color stability, good light response, and good anti-fatigue of repeated color change. As shown in FIG. 3, cyan photochromic dye 11, magenta photochromic dye 12, and yellow photochromic dye 13 are selected, and the photochromic dyes of each color are uniformly mixed in a certain proportion to obtain the required photochromic dye 10, ensuring that the mixing process does not introduce impurities. The mixed dye is in a powder state, and additives can be added to improve its environmental stability and reliability. The dye can also be subjected to quality tests such as color test, light response test, and environmental stability test to ensure that the photochromic dye mixture meets the expected standards and effects.

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

[0068] Specifically, the powder photochromic dye 10 can be first converted into a form suitable for spraying. In a specific operation, the powder dye can be mixed with a suitable solvent to form a uniform dye suspension. This suspension can be adjusted to a suitable viscosity for the spray gun 14 to ensure uniform distribution of the dye and maintenance of the optimal particle size during the spraying process. A high-precision pneumatic or electric spray gun can be used for spraying, and the target object 15 can be uniformly sprayed 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 is adequately covered with dye while avoiding unevenness caused by excessive accumulation. As shown in FIG. 4, the colored appearance of the target object 15 does not change after spraying. After the thin film spraying is completed, a series of post-processing steps can usually be performed, such as applying a transparent protective coating to enhance the wear resistance and environmental resistance of the finished product.

[0069] For fiber or fabric objects, the dye can also be applied by immersion, i.e., by immersing the object in a solution containing the dye to ensure that each fiber fully absorbs the dye.

[0070] In addition, for some fine pattern dyeing, screen printing or digital inkjet technology can be used, which allows precise application of dye in specific areas to form complex designs or patterns that can produce color change.

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

[0072] Specifically, after the photochromic dye is applied to the object, as shown in FIG. 5, a special waveband of ultraviolet light from the ultraviolet light source 16 is used to irradiate the photochromic dye on the surface of the target object 15, making the color of the photochromic dye on the surface of the target object 15 reach a completely black saturated state.

[0073] In the physical color theory, all color images can be separated by the CMY three-color channel (cyan, magenta, yellow) to obtain three single-color images with different color depth distributions. According to the reverse thinking, if three cyan, magenta and yellow images with specific color depth distribution can be created on the physical medium, a full-color image can be synthesized by superimposing the three images, which is essentially the process of restoring the original image color through the color mixing theory. The material used in Photo-Chromeleon technology is essentially a mixture of cyan, magenta and yellow photochromic materials, which will all reach a saturated state after being irradiated by special ultraviolet light, so that the mixed dye becomes a state close to black. At this time, this full black state material can be regarded as the basis for the bottom image formed by the complete saturation of the CMY three colors.

[0074] S400, using a light processing method to process the full black photochromic dye on the surface of the object, to generate a color change result.

[0075] The S400, using a light processing method to process the full black photochromic dye on the surface of the object, specifically includes the following steps:

[0076] S410, separating the design pattern into three single-color images of red, green and blue channels.

[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 three single-color images of red, green and blue channels, and the color intensity values of different pixel points on a single-color image may be the same or different based on the original design pattern.

[0078] This separation process can be automatically completed by computer image processing software or programming tools, etc.

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

[0080] S411, read the color information of each pixel point from the design pattern. In the RGB color model, the color of each pixel point is composed of the intensity values of the red (R), green (G) and blue (B) channels, and the intensity range is 0 to 255. For example, the color information of a certain pixel point 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, the information of red, green and blue channels is extracted respectively, and they are processed independently to obtain three monochrome images, each of which contains only the intensity information of one color channel. For example, for a pixel point 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 intensity of other colors is 0.

[0082] S420, T Cyan , T Magenta and T Yellow are obtained. Cyan , T Magenta and T Yellow are defined as follows: based on the RGB color model with a numerical range of 0-255, when the light with RGB values of (255, 0, 0), (0, 255, 0) and (0, 0, 255) is respectively irradiated on the full black photochromic dye, the time when the sky blue, magenta and yellow on the full black photochromic dye are completely eliminated respectively is T Cyan , T Magenta and T Yellow .

[0083] The values of T Cyan , T Magenta and T Yellow can be obtained by consulting materials or measurement.

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

[0085] S421, a target irradiation area is selected on the full black photochromic dye.

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

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

[0088] When the photochromic dye is applied to the surface of an object, the concentration, thickness and the like will be different. The same T Cyan , T Magenta and T Yellow are used for photochromic dyes with different concentrations and thicknesses, and the final color pixels obtained after light processing will be different from the user's design pattern.

[0089] In the original Photo-Chromeleon technology light processing method, the adverse effects of the concentration, thickness and the like of the material coating on the actual object on the color change result are not considered. The original scheme of this technology is to collect the color change curves of the selected three kinds of photochromic dyes under different wavelength light conditions through experiments in advance, and store these data in the computer. During irradiation, only these pre-stored data are used to implement the optimization algorithm and output light. However, in the actual irradiation process, the irradiation time of different concentrations and thicknesses of materials at each wavelength during the fading process will also be different, and the fading rate will also change. Therefore, in the specific implementation process of the original technology, there is a lack of light irradiation data calibration for specific examples, which will also lead to the inability to achieve precise target color change effect.

[0090] In this embodiment, T Cyan , T Magenta and T Yellow of the target full-black photochromic dye are measured, and the irradiation time of the three kinds of light is calibrated according to different photochromic dyes on different objects. The obtained results are based on the actual concentration, thickness and the like of the photochromic dye on the actual object, and therefore a more precise color change effect can be achieved, the final color pixels obtained after light processing are more consistent with the user's design pattern, and the reliability of the color change result is higher.

[0091] S430, project the monochrome image of the red channel obtained in S410 for a T cyan long time onto the full-black photochromic dye, and project the monochrome image of the green channel obtained in S420 for a T magentaThe S410 obtained monochrome image of green channel is projected onto the full black photochromic dye for a time length of T yellow The S410 obtained monochrome image of blue channel is projected onto the full black photochromic dye for a time length of T

[0092] Specifically, let the total projection time length of the red image be T cyan Then the red pixels of different brightness levels from 0 to 255 in the image will fade the corresponding cyan component in proportion, and finally form an image composed of cyan pixels of different depths in the cyan channel of the material, which is opposite to the contrast of the projected image.

[0093] Let the total projection time length of the green image be T magenta， Then the green pixels of different brightness levels from 0 to 255 in the image will fade the corresponding magenta component in proportion, and finally form an image composed of magenta pixels of different depths in the magenta channel of the material, which is opposite to the contrast of the projected image.

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

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

[0096] The color image projected by a digital projector 17, for example, is composed of a large number of pixels, each of which has a different color, which is essentially formed by the superimposed combination of pixels of red, green, and blue (RGB) light of different intensities. Each pixel has a different level of intensity, usually ranging from 0 to 255, which represents the 256 levels of intensity of the pixel, with 0 representing complete black (no light output) and 255 representing the maximum light intensity output. The optical display principle of the projector allows the intensity of the pixel to be finely graduated in these 256 levels, so that different colors of pixels can be produced by the superimposed combination of red, green, and blue (RGB) light of different intensities.

[0097] Based on the light irradiation principle of the projector, taking red light as an example, it is assumed that, within a certain time range, red light of intensity 255 can completely eliminate the blue light component of the mixed dye. Since the irradiation intensity is directly proportional to the fading speed of the photochromic material, within this certain time range, the red light of different intensities from 0 to 255 projected onto the color-saturated material will cause the blue component to have different color depths from 255 to 0 after irradiation. This principle is also applicable to the use of green light acting on the magenta photochromic dye and the use of blue light acting on the yellow photochromic dye.

[0098] Specifically, within a pixel range of light irradiation, there is black photochromic material that is completely saturated after ultraviolet irradiation, and the CMY color depth is (255, 255, 255). If the red light pixel of intensity 255 can completely eliminate the blue component in the material within time T cyan , then within this time, the color depth of the remaining blue component in the material in this pixel range can be adjusted to 255-I red after irradiation of the red light pixel of intensity I red (0≤I red ≤255). Similarly, if the green light pixel of intensity 255 can completely eliminate the magenta component in the material within time T magenta , then after irradiation of the green light pixel of intensity I green (0≤I green ≤255), the color depth of the remaining magenta component in this region is 255-I green . Similarly, if the blue light pixel of intensity 255 can completely eliminate the yellow component within time T yellow , then after irradiation of the blue light pixel of intensity I blue (0≤I blue ≤255), the color depth of the remaining yellow component in this region is 255-I blue .

[0099] And based on the complementary relationship between CMY color model and RGB color model, RGB color model generates color by emitting light, and CMY color model generates color by absorbing light. If the RGB color value of a pixel is (I red , green， , blue ), then the color value under the CMY color model is (255-I red , 255-I green , 255-I blue ).

[0100] In summary, if the material is irradiated by red, green and blue light pixels with intensity levels I cyan， , magenta， and I yellow for T red， , green and T blue respectively, the color pixel with CMY color value (255-I red , 255-I green , 255-I blue ) can be generated on the material after the irradiation, which is the color pattern composed of cyan, magenta and yellow channels corresponding to the user's design pattern, thereby realizing the accurate reproduction of complex colors.

[0101] According to the original technical solution of Photo-Chromeleon, the irradiation time of different wavelengths of light required by each pixel in the image needs to be calculated one by one according to the user-imported design image, and this control process is integrated into a dynamic image imported into a projector to realize the process of dynamic light irradiation. This process is very tedious and has a huge task. In the original Photo-Chromeleon technology, the irradiation time of each pixel is controlled to achieve the color change result of the material under the locked light intensity of R, G and B pixels. Only the use of red, green and blue (RGB) brightest light intensity to process the photochromic material in each pixel point is considered, and the intensity values of the three different wavelengths of light are fixed. Then, the irradiation time of the three different color pixels is controlled to make the photochromic material in this area eliminate the cyan, 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 point of view, and makes the material generate color change in pixel units. In addition to controlling the irradiation time of RGB three different light in the pixel range, the digital light projector can also accurately adjust the irradiation intensity of the three different wavelengths of light on each pixel point.

[0102] As known from the foregoing, if the light treatment method for changing the color of the full black photochromic dye in the above embodiments is used, when processing the color design scheme of the user, the computer end will not need to analyze each pixel one by one, and the color changing process only needs to consider directly implementing the light irradiation of the overall monochrome image in the RGB three different light channels. This light treatment method only needs to process the color image from a macroscopic perspective, and through controlling the irradiation intensity of each pixel, the color changing result of the material is achieved under the irradiation time of the R, G and B three different light channels. The signal fed back to the digital projector is also the overall image signal, without the 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 end, saves time, reduces the complexity of calculation, and is convenient for running on devices with limited processing capacity, such as mobile phones or single-chip microcomputers, thereby enhancing portability and application potential and making the application scenario more extensive. The idea of switching from time control to light intensity control can simplify the light processing process of the technology from a macroscopic perspective and avoid the cumbersome calculation burden.

[0103] That is, the full black photochromic dye on the surface of the object is subjected to light treatment by using the light treatment method described in steps S410, S420 and S430, and a color changing result is generated, as shown in FIG. 7. The digital projector 17 performs light treatment on the target object 15 initialized by ultraviolet light and generates a schematic diagram of a color changing result meeting the user's requirements.

[0104] Specifically, since different wavelengths of red light, green light and blue light only affect the corresponding sky blue, magenta and yellow components in the photochromic mixture, respectively, and the light of different wavelengths and intensity distributions is used to eliminate a certain proportion of color depth in the sky blue, magenta and yellow image channels of the material according to a specific position and intensity sequence, different color depth distributions belonging to the respective channels can be created in the three channels of CMY, and a color image with rich colors can be obtained on the overall material through superposition. Since this full-color image is synthesized by accurately regulating the color depth distribution of the three colors of CMY, the 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 quickly respond to changes in light and save time. The small size of the target irradiation area also makes it easier for the detection device to more accurately detect the complete elimination of sky blue, magenta and yellow, and obtain more accurate and reliable T Cyan , T Magenta and T Yellow . Further, the size of the target irradiation area can be 5 mm x 5 mm to 20 mm x 20 mm.

[0106] Shorten the response time

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

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

[0109] S422, irradiating light with RGB values of (255, 0, 0), (0, 255, 0) and (0, 0, 255) respectively on the n target irradiation regions;

[0110] S423, when cyan, magenta and yellow of each target irradiation region are detected to be completely eliminated respectively, record the required time as T Cyan,1 , T Cyan,2 …T Cyan , T Magenta,1 , T Magenta，2 …T Magenta，n , and T Yellow ,1, T Yellow,2 …T Yellow,n respectively. Cyan，1 , T Cyan,2 …T Cyan , and T Magenta，1、 T Magentat2 …T Magenta， n , and T Yellow ,1, T Yellow，2 …T Yellow,n are obtained by using statistical methods according to T Cyan , T Magenta and T Yellow .

[0111] Wherein, the n target irradiation regions can be selected in the color-changing range according to a predetermined resolution or step. The calibration of light irradiation time is performed on the n target irradiation regions one by one, the calibration time of different wavelengths of light is recorded in these regions, and statistical methods (such as taking average, weighted average, regression analysis, etc.) are combined to finally determine T Cyan , T Magenta and T Yellow . The method of the embodiment can effectively deal with the thickness, concentration difference or other surface unevenness of the material in the spraying process, and more greatly reduce the local deviation caused by single region calibration, thereby improving the uniformity and precision of the overall color-changing effect.

[0112] Wherein, when the step S420 in the step S400 is realized by the steps S421, S422 and S423 in the aforementioned two embodiments, the step S420 can be executed before the step S300, thereby avoiding affecting the full-black photochromic dye obtained in the step S300.

[0113] In one embodiment, the monochromatic images of the three channels of red, green and blue projected on the full black photochromic dye in the S430 are projected at the same starting time. Since the light of each wavelength of red, green and blue mainly affects the color depth of one of the cyan, magenta and yellow channels, the irradiation process of red, green and blue light can be carried out simultaneously or sequentially, and will not significantly affect the generation of color. 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 full black photochromic dye can be improved.

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

[0115] S500, judge whether a new color change result needs to be generated, if yes, jump to step S300 and start executing from step S300 again; if no, complete the color change.

[0116] Specifically, if the user needs to change the color again on the basis of the completed color change pattern, as shown in FIG. 8, the target object 15 that has been color changed can be irradiated again by the special waveband ultraviolet light of the ultraviolet light source 16, so that the cyan, magenta and yellow dyes in the color change material are excited again, and the color depth reaches the saturation state. At this time, the user inputs his new design pattern to the computer end again, and the color changing can be performed on the same object again through the light processing method of step S400. Finally, a new pattern different from the previous one is created on the same object, as shown in FIG. 9. By repeating this process, the color of the same object can be repeatedly changed. If the user does not need to change the color again, the photochromic of the object is completed, and the user can use the object according to the current color change result.

[0117] The present application significantly enhances the flexibility and adaptability of the original technology. Based on the new light processing method proposed in the present application, even if the formula of the photochromic dye needs to be improved and adjusted at a later stage, a large amount of preliminary experiments and data collection need not be performed again. Since the light processing method of the present application can automatically adjust the light irradiation parameters during the correction process, the overall irradiation process of the different light channels of RGB is also independent of the specific dye formula. This makes the technology more quickly respond to the adjustment of the dye formula and the demand of new applications, and is conducive to the upgrading, rapid iteration and more diversified application of the technology formula.

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

[0119] S500, determine whether the color change result is accurate, if yes, complete the color change; if not, execute step S600. The surface image after color change can be collected using sensors, cameras or other detection units, and compared with the expected design pattern. Step S600 is a compensation for the color change result, which is a correction process.

[0120] As shown in FIG. 13, S600 specifically includes the following steps:

[0121] S610, calculate the deviation pattern between the design pattern and the color change result. The deviation pattern reflects the color gap between the current color change effect and the expected design.

[0122] S620, obtain monochrome images of red, green and blue channels and / or ultraviolet light images based on the deviation pattern. The ultraviolet light image is used to supplement and deepen the color, and the monochrome images of red, green and blue channels are used to continue to eliminate the color.

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

[0124] Based on steps S500 and S600, the color change effect can be further ensured to be 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 effect.

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

[0126] Step one, obtain photochromic dye. Select materials: select diarylethene compounds as the main material of photochromic dye, which specifically includes cyan, magenta and yellow photochromic dyes. Mix the 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 two, apply the photochromic dye to the object surface, i.e. apply the photochromic dye to the PVC card. Prepare the dye suspension: mix the powdered photochromic dye with the 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, ensuring that the dye evenly covers the surface of the card. After spraying is complete, a layer of transparent protective coating can be applied to the surface of the card to enhance the wear resistance and environmental resistance of the finished product.

[0128] Step three, perform the projection time calibration. Initialize the color: use a special band of ultraviolet light to irradiate the PVC card sprayed with photochromic dye, making its color reach a black saturated state, providing a basis for the calibration of projection time. Use the aforementioned light processing method to process the full black photochromic dye on the surface of the object, generating a color change result. Calibrate the projection time: before the color change process, 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 (T Cyan 、T Magenta 、T Yellow ) for each color to completely disappear. Adjust the light irradiation parameters: based on the data recorded by the color sensor, adjust the irradiation time of red, green, and blue light to ensure precise color change effects in actual operation.

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

[0130] Step five, use a digital projector to perform light projection. Design the pattern: import the desired lion pattern into the computer and separate the pattern into single-color images for the RGB three channels, as shown in Figure 10. Project the pattern: use a digital projector to project the decomposed red, green, and blue light images onto the CMY channels of the material. Project different intensities of red, green, and blue light images at different time periods to produce different color depth distributions of cyan, magenta, and yellow photochromic dyes in the corresponding channels, as shown in Figure 11.

[0131] The irradiation time of the red light image is T Cyan , which produces the residual color needed for the color change result in the cyan channel. The irradiation time of the green light image is T Magenta , which produces the residual color needed for the color change result in the magenta channel. The irradiation time of the blue light image is T YellowThe residual color required for the yellow channel to produce the color change result. The color image generated: the residual color of the three channels of the mixed photochromic dye after the image irradiation of the RGB three different light channels is the color image that meets the user's design requirements.

[0132] Figure 12 shows the actual color change results on the PVC card, including:

[0133] Initial state, the pure white PVC card has no color when not irradiated by ultraviolet light.

[0134] Black saturated state, after irradiation by ultraviolet light, the photochromic material on the card is completely excited to a black saturated state.

[0135] Generated color image, by projecting the images of the RGB three channels respectively through the digital projector, the T Cyan、 T Magenta , T Yellow time, generate the lion pattern color change effect as expected by the design.

[0136] Further, if color erasing and re-creating are required, the following steps can be taken:

[0137] Color erasing, if the pattern needs to be changed, step four can be returned to, and the already colored PVC card is irradiated by ultraviolet light of a special wave band to restore its color to the initial black state.

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

[0139] This embodiment details the specific operation steps of realizing the lion pattern color change on the PVC card, proving the feasibility and practical application value of the method.

[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 red, green and blue three channels of the monochrome image can also be reduced in proportion to match the time of the other channels, so that the irradiation times of the T Cyan , T Magenta and T Yellow three channels are unified to a longer time range. Thus, the light treatment method for changing the color of the all-black photochromic dye in this embodiment only needs to be operated according to the unified time parameter, without the need to adjust the time for each channel individually, reducing the complexity of control, better synchronizing the processing or simplifying the control process, making the color change process more convenient and smooth, and improving the user experience.

[0141] Specifically, the S400, the light treatment method is used to treat the all-black photochromic dye on the surface of the object, specifically including the following steps:

[0142] S410, Separate the design pattern into a monochrome image with 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 numerical range of 0-255, when light with RGB values ​​of (255, 0, 0), (0, 255, 0), and (0, 0, 255) is shone onto the all-black photochromic dye, the time it takes for the magenta, cyan, and yellow hues on the all-black photochromic dye to be completely eliminated is defined as T. Cyan T Magenta and T Yellow ;

[0144] S430, The brightness of the monochrome images of the red, green, and blue channels obtained in S410 is respectively expressed as T... Cyan / T max T Magenta / T max and T Yellow / T max The proportions are reduced to obtain an optimized monochrome image with red, green, and blue channels. T is defined as follows. Cyan、 T Magenta and T Yellow The maximum value in is T max ;

[0145] S440: Project the optimized monochrome images of the red, green, and blue channels obtained in S430 onto the all-black photochromic dye, with a projection time of T for each projection. max .

[0146] In other embodiments, the overall light irradiance of the monochrome image in the red, green, and blue channels can be increased proportionally, thereby shortening the color-changing time, accelerating the color-changing process, and improving the overall color-changing efficiency.

[0147] In one embodiment, a photochromic device for an object, based on the photochromic method for an object described in the above embodiments, 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 photochromic dye to the surface of the object, and can include a spray gun loaded with mixed photochromic dye, a soaking pool, a printing device, etc. The first light projection unit is used to project ultraviolet light onto the photochromic dye on the surface of the object, and can include an ultraviolet laser, an ultraviolet LED light source, etc. The device can project special waveband ultraviolet light, so that the color of the mixed photochromic dye reaches full black. The monochrome image generation unit generates monochrome images of red, green and blue three channels according to the design pattern, and can include image processing software or programming tools, etc. The second light projection unit is used to project monochrome images of red, green and blue three channels onto the photochromic dye on the surface of the object respectively, and can include a digital projector, a laser projector, etc.

[0149] a control unit for obtaining the time T Cyan , T Magenta and T Yellow at which the cyan, magenta and yellow colors on the photochromic dye on the surface of the object are completely eliminated respectively, and controlling the projection of the second light projection unit based on T Cyan , T Magenta and T Yellow , and the monochrome images of red, green and blue three channels generated by the monochrome image generation unit. The control unit can include a single-chip microcomputer, a portable computer, etc.

[0150] The control unit controls the projection of the second light projection unit, specifically, the control unit controls the second light projection unit to project monochrome images of the red channel for T cyan , monochrome images of the green channel for T magenta , and monochrome images of the blue channel for T yellow on the photochromic dye on the surface of the object respectively.

[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, and specifically, the control unit controls the second light projection unit to project the optimized monochrome images of red, green and blue three channels onto the full black photochromic dye, and the projection time is T max。 In this embodiment, the control unit only needs to control T max a time, reducing the control and improving the efficiency.

[0152] The object photochromic device in the embodiment is based on the object photochromic method described in the above embodiments, greatly reduces the requirements for the processing capacity of the monochromatic image generation unit and the control unit, and the volume of the monochromatic image generation unit and the control unit can be reduced, so that the object photochromic device is more portable and lightweight, and is convenient for popularization and application.

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

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

[0155] A target irradiation area of the photochromic material on the surface of the target object is selected, and a micro color sensor is installed on the area. The device should be small enough to be easily attached to the surface of the target object without affecting the color change process of the object. A projector is used to project red light, green light and blue light with an intensity of 255 on the material in the area in turn. Since the color sensor can detect the intensity of light of a specific wavelength, it can be set to specifically sense the reflectivity changes of the wavelengths corresponding to cyan, magenta and yellow (CMY). When the three specific color components are completely eliminated in turn, the reflectance spectrum of the material will change differently. The three specific times T Cyan , T Magenta and T Yellow can be recorded by the color sensor and fed back to the second light projection unit. After receiving the data, the second light projection unit will automatically adjust the light projection time length in the red, green and blue light irradiation process according to the time required for the complete elimination of the CMY different color components, to ensure accurate color change effect on the target object.

[0156] In one embodiment, the object photochromic device further comprises a judging unit which terminates operation or reactivates the monochromatic image generating unit, the control unit and the second light projecting unit according to the instruction. If the user has obtained the desired color pattern, the judging unit can terminate operation according to the instruction of the user. If the user needs to change the color again on the basis of the color-changing pattern that has been completed, the judging unit can reactivate the monochromatic image generating unit, the control unit and the second light projecting unit according to the instruction of the user to generate a new color pattern. The judging unit can reactivate the monochromatic image generating unit, the control unit and the second light projecting unit for 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 determining unit for determining the maximum value T Cyan of T Magenta , T Yellow and T max ; the control unit controls the projection of the second light projecting unit based on T Cyan , T Magenta , T Yellow , T max determined by the time determining unit and the monochromatic images of red, green and blue three channels generated by the monochromatic image generating unit. The brightness of the monochromatic images of red, green and blue three channels is weakened in the proportion of T Cyan / T max , T Magenta / T max and T Yellow / T max respectively to obtain the optimized monochromatic images of red, green and blue three channels, and the control unit can control the second light projecting unit to project the optimized monochromatic images of red, green and blue three channels to the full-black photochromic dye, and the projection time is T max , which reduces the complexity of control.

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

[0159] In the description of the present specification, the terms "connection", "installation", "fixation", "arrangement", "have" and the like are understood in a broad sense, for example, "connection" can be fixed connection, or detachable connection, or integrally connected; can be mechanical connection, or electrical connection; can be directly connected, or indirectly connected through an intermediate medium, or internal communication of two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0160] In the description of the present specification, the relationship terms such as "first" and "second" are only used 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 the entities or operations. Moreover, the terms "include", "contain" or any other variant thereof are intended to cover non-exclusive inclusion, so that the process, method, article or device including a series of elements not only includes those elements, but also includes other elements not explicitly listed, or includes elements inherent to such process, method, article or device. Without more limitations, the element defined by the statement "including 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 the understanding and application of the technology by those skilled in the art. Those skilled in the art can easily make various modifications to these examples, and apply the general principles described herein to other embodiments without creative labor. Therefore, the present application is not limited to the above embodiments, and the following modifications should be within the scope of protection: ① new technical solutions based on the technical solutions of the present application and combined with existing common knowledge, the technical effects generated by the new technical solutions do not exceed the technical effects of the present application; ② equivalent replacement of part of the features of the technical solutions of the present application using known technology, the technical effects generated are the same as the technical effects of the present application; ③ expandable based on the technical solutions of the present application, the essential content of the expanded technical solutions does not exceed the technical solutions of the present application; ④ equivalent transformation using the contents of the present application specification and drawings, direct or indirect application in other related technical fields.

Claims

A method of photochromic of an object, characterized in that, The method comprises the following steps: S100, acquiring a photochromic dye; S200, applying the photochromic dye to a surface of an object; S300, initializing the photochromic dye on the surface of the object to be full black; S400, performing light processing on the full black photochromic dye on the surface of the object by using a light processing method to generate a color change result; The S400, performing light processing on the full black photochromic dye on the surface of the object by using a light processing method, specifically comprises the following steps: S410, separating the design pattern into monochrome images of three channels of red, green and blue; S420, obtaining T Cyan , T Magenta and T Yellow , the T Cyan , T Magenta and T Yellow are defined as follows: based on the RGB color model with a numerical range of 0-255, when the light with RGB values of (255, 0, 0), (0, 255, 0) and (0, 0, 255) respectively irradiates on the full-black photochromic dye, the time when the sky blue, magenta and yellow on the full-black photochromic dye are completely eliminated respectively is T Cyan , T Magenta and T Yellow ; S430, projecting T cyan S410 obtained red channel monochrome image onto the full black photochromic dye for a duration T Magenta S410 obtained green channel monochrome image onto the full black photochromic dye for a duration T yellow S410 obtained blue channel monochrome image onto the full black photochromic dye for a duration T The object photochromic method according to claim 1, wherein, The S420 specifically comprises the following steps: Selecting a target irradiation area on the full black photochromic dye; Irradiating light with RGB values of (255, 0, 0), (0, 255, 0) and (0, 0, 255) on the target irradiation area; The time required for the complete elimination of the blue, magenta and yellow colors of the target irradiated area is recorded as T Cyan , T Magenta and T Yellow , respectively. The object photochromic method according to claim 2, wherein, The size of the target irradiation area is 1 square millimeter to 25 square centimeters. The object photochromic method according to claim 3, characterized in that, The target irradiation area includes n, Irradiating light with RGB values of (255, 0, 0), (0, 255, 0) and (0, 0, 255) on the n target irradiation areas, respectively; The time required for each of the target irradiation regions to be detected to be completely eliminated 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 , 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 , T Cyan , T Magenta , and T Yellow are obtained using statistical methods. The object photochromic method according to any one of claims 1 to 4, characterized in that, After step S400, the following steps are further included: S500, judging whether a new color change result needs to be generated, if yes, jumping to step S300 and re-executing from step S300; if no, completing the color change. The object photochromic method according to any one of claims 1-4, characterized in that, After step S400, the following steps are further included: S500, judging whether the color change result is accurate, if yes, completing the color change; if no, executing step S600, and the S600 specifically comprises the following steps: S610, calculating a deviation pattern between the design pattern and the color change result; S620, acquiring monochrome images of three channels of red, green and blue and / or ultraviolet light images based on the deviation pattern; S630, projecting the monochrome images of three channels of red, green and blue and / or ultraviolet light images acquired in S620 onto the photochromic dye on the surface of the object processed in step S400 to generate a new color change result after correction. The object photochromic method according to any one of claims 1 to 4, characterized in that, The S400, performing light processing on the full black photochromic dye on the surface of the object by using a light processing method, specifically comprises the following steps: S410, separating the design pattern into monochrome images of three channels of red, green and blue; S420, acquiring T Cyan , T Magenta , and T Yellow , the T Cyan , T Magenta , and T Yellow are defined as follows: based on the RGB color model with a numerical range of 0-255, when the light with RGB values of (255, 0, 0), (0, 255, 0), and (0, 0, 255) respectively irradiates on the full-black photochromic dye, the time when the sky blue, magenta, and yellow on the full-black photochromic dye are completely eliminated respectively is T Cyan , T Magenta , and T Yellow ; S430, the brightness of the monochrome images of the red, green and blue three channels obtained in S410 is respectively reduced by the ratio of T Cyan / T max , T Magenta / T max and T Yellow / T max , to obtain the optimized monochrome images of the red, green and blue three channels, and the maximum value of T Cyan , T Magenta and T Yellow is defined as T max ; S440, projecting the single-color images of the three channels of red, green and blue obtained in S430 onto the full-black photochromic dye, and the projection time is T max . An object photochromic device based on the object photochromic method according to any one of claims 1 to 7, characterized in that It comprises: A photochromic dye application unit for applying a photochromic dye to a surface of an object; A first light projection unit for projecting ultraviolet light onto the photochromic dye on the surface of the object; A monochrome image generation unit for generating monochrome images of three channels of red, green and blue according to a design pattern; A second light projection unit for projecting monochrome images of three channels of red, green and blue onto the photochromic dye on the surface of the object, respectively; a control unit configured to acquire times T Cyan , T Magenta , and T Yellow at which the blue, the magenta, and the yellow, respectively, are completely eliminated on the photochromic dye of the object surface, and control the projection of the second light projection unit based on T Cyan , T Magenta , and T Yellow , and monochrome images of three channels of red, green, and blue generated by the monochrome image generation unit. The object photochromic device according to claim 8, characterized in that, It further comprises: a detection unit for detecting the time T at which the blue, the magenta and the yellow color on the photochromic dye of the object surface are completely eliminated, respectively Cyan , T Magenta and T Yellow and delivering T Cyan , T Magenta and T Yellow to the control unit. The object photochromic device according to claim 8, characterized in that, Further comprising a time determination unit for determining the maximum of T Cyan , T Magenta , and T Yellow , T max ; The control unit controls the projection of the second light projection unit based on T Cyan , T Magenta , and T Yellow , T max determined by the time determination unit, and the monochrome images of the three channels of red, green, and blue generated by the monochrome image generation unit.

Images