CN113119649A

CN113119649A - Special paper for knife painting for assisting painting and auxiliary device thereof

Info

Publication number: CN113119649A
Application number: CN202110230210.XA
Authority: CN
Inventors: 王静; 钟沂珊
Original assignee: Individual
Current assignee: Individual
Priority date: 2021-03-02
Filing date: 2021-03-02
Publication date: 2021-07-16
Anticipated expiration: 2041-03-02
Also published as: CN113119649B

Abstract

The invention relates to a knife drawing special paper for assisting drawing and an assisting device thereof, wherein the device at least comprises a drawing acquisition unit, at least one visible light source, an image processing unit and a light control assembly, the image processing unit identifies line outlines in drawing based on a drawing draft acquired by the drawing acquisition unit, and the light control assembly controls the visible light source to project light rays corresponding to the line outlines on the knife drawing special paper based on the line outlines sent by the image processing unit, so that a line outline pattern consistent with the drawing draft is formed on the knife drawing special paper. The line contour of the drawing draft is generated by photosensitive reaction between the specific light and the special drawing paper, so that the drawing difficulty of a knife drawing beginner who does not draw a draft is reduced.

Description

Special paper for knife painting for assisting painting and auxiliary device thereof

Technical Field

The invention relates to the technical field of knife drawing and painting, in particular to a special paper for assisting knife drawing and an auxiliary device thereof.

Background

The knife drawing originated in 1995, which means that a piece of paper is knife-drawn, and a small blade is used for removing surface color and leaving knife marks on coated paper by using the skill of Chinese craft strokes for reference, so that a picture with vivid image is formed. Knife painting is recognized by the painting industry as a new form of painting. Compared with other drawing modes, the creation difficulty of knife drawing is that the knife engraving on the coated paper is difficult to avoid errors. The art paper knife painting needs to be directly drawn. The direct drawing is to directly draw on the coated paper by a knife, a manuscript cannot be drawn before drawing, the contour line cannot be encircled, namely the contour line cannot be drawn in advance like other drawings, then filling, drawing and painting are formally carried out inwards along the contour line, and finally the contour line is covered or wiped off. If the coated paper knife print is made with a manuscript in advance, the outline cannot be processed. If the pencil is used for drawing the outline, the outline is wiped off afterwards, so that the expression effect of the drawing is also influenced, the coated paper is bright and smooth, fine and dust-free, any trace is not allowed to exist, and even the light eraser is used for wiping, the glossiness of the paper board is damaged, so that the image quality is influenced. The art paper knife painting can not have any trace in the painting process. Once there is an error, the picture is abandoned. The coated paper has high thickness and good glossiness, and once a knife leaves a mark on a paperboard, the knife can be permanently stored, and the coated paper can not be covered by other colors and can not change the line trend. Therefore, the knife can only be formed at one time accurately when the copper plate paper is carved by the knife.

Because the difficulty of knife carving exists, the knife-drawing learner who enters the line for the first time can not exercise the carving conveniently. Therefore, in order to facilitate the development of knife drawing art and reduce the difficulty of practicing knife drawing by beginners, a special paper for knife drawing and an auxiliary tool capable of assisting the beginners in drawing are needed.

Furthermore, on the one hand, due to the differences in understanding to the person skilled in the art; on the other hand, since the inventor has studied a lot of documents and patents when making the present invention, but the space is not limited to the details and contents listed in the above, however, the present invention is by no means free of the features of the prior art, but the present invention has been provided with all the features of the prior art, and the applicant reserves the right to increase the related prior art in the background.

Disclosure of Invention

Aiming at the defects of the prior art, the invention provides a knife drawing assisting device for assisting drawing, which at least comprises a drawing acquisition unit, at least one visible light source, an image processing unit and a light control assembly, wherein the image processing unit identifies line outlines in drawing based on a drawing draft acquired by the drawing acquisition unit, and the light control assembly controls the visible light source to project light rays corresponding to the line outlines on special paper for knife drawing based on the line outlines sent by the image processing unit, so that a line outline pattern consistent with the drawing draft is formed on the special paper for knife drawing.

Preferably, the device further comprises at least one color-changing light source, and when the special paper for knife drawing contains a photochromic component, the light control component controls the visible light source to project light on the special paper for knife drawing according to a track corresponding to the line profile based on the line profile sent by the image processing unit, the special paper for knife drawing forms a visible line corresponding to the line profile of the drawing draft based on a reversible photosensitive reaction between the photochromic component and the color-changing light source,

and under the condition that the light of the color-changing light source disappears and the color-changing recovery time is reached, the visible lines on the special paper for knife painting gradually change to disappear.

Preferably, the light control component controls the visible light source to project the line profile in a pre-projection manner on the special paper for cutting based on the line profile sent by the image processing unit,

and after the standing time of the special paper for knife drawing exceeds the preset time, the image processing unit records and stores the position information of the line outline based on the calibration identification on the special paper for knife drawing.

Preferably, the light control component determines the projection position and/or projection track of the color-changing light source on the special paper for knife drawing based on the calibration mark on the special paper for knife drawing and the position information of the line outline sent by the drawing collection unit.

Preferably, the light control component controls the working state of the visible light source and/or the color-changing light source based on the surface temperature and/or the temperature change of the special paper for knife drawing fed back by the infrared temperature component.

And under the condition that the surface temperature and/or the temperature change of the special paper for cutting and painting exceeds a preset temperature threshold value, the light control assembly adjusts the illumination intensity, the illumination time, the number of the light sources or turns off the light sources of the visible light source and/or the color-changing light source.

Preferably, the visible light sources and the color-changing light sources are independently distributed, and the visible light sources and the color-changing light sources are respectively connected with the corresponding light control assemblies; and/or

The visible light sources and the color changing light sources are distributed in a staggered manner so that the visible light sources and the color changing light sources share the light control assembly.

Preferably, the photochromic reversible photochromic component on the special paper for knife drawing is distributed on the coating, and/or

The special paper for knife painting is provided with a photochromic reversible photochromic film.

Preferably, the photochromic reversible photochromic component on the special paper for knife drawing does not develop color under the irradiation of visible light.

The invention also provides the special paper for knife drawing for assisting drawing, the coating paint of the special paper for knife drawing contains photochromic reversible components, and/or the special paper for knife drawing is provided with photochromic reversible films,

under the condition that the color-changing light source projects light rays to the special paper for knife drawing in a corresponding track according to the line contour of the drawing draft,

the special paper for knife drawing forms visible lines corresponding to the line outline of the drawing draft based on the reversible photosensitive reaction of the photochromic component and the photochromic light source,

Preferably, at least one calibration identifier which can be identified by the knife drawing assisting device is arranged on the special paper for knife drawing, so that the knife drawing assisting device can determine the projection position and/or the projection track of the color-changing light source projected onto the special paper for knife drawing based on the calibration identifier.

The invention has the beneficial technical effects that:

(1) according to the special paper for knife drawing, which contains the photochromic reversible photochromic component, a knife drawing author can draw on the special paper for knife drawing by holding the light source pen corresponding to the photosensitive reaction of the photochromic component and generate a drawing draft with limited color development time, so that the difficulty of drawing the draft by a knife drawing beginner is reduced;

(2) the invention also provides a knife drawing auxiliary device which can be matched with the special paper for knife drawing, and the knife drawing auxiliary device has the following advantages compared with a common light source pen: the draft formed by the common light source pen cannot be repeated after disappearing, and the drawing is an unreproducible art, so that the drawing draft disappears in the middle of drawing, and a knife drawing author is hindered; the knife drawing auxiliary device can collect drawing drafts and repeatedly reappear the drawing drafts on the paper special for knife drawing, does not cause the displacement of the drawing drafts, and thoroughly solves the problem that the knife drawing drawings can not be used as the drawing drafts.

Drawings

FIG. 1 is a schematic view of the paper and the auxiliary device for knife drawing according to the present invention;

FIG. 2 is a schematic structural diagram of the knife-drawing assisting device of the present invention;

FIG. 3 is a schematic structural view of a light management assembly of the present invention;

FIG. 4 is a schematic view of another angled configuration of a light management assembly.

List of reference numerals

10: an auxiliary tool; 20: cutting and drawing special paper; 11: a drawing acquisition component; 12: a visible light source; 13: a color-changing light source; 14: an image processing unit; 15: a light control assembly; 41: a mirror assembly; (ii) a 50: a first reflector; 51: a first fulcrum; 52: a second fulcrum; 53: reflecting the light; 54: a third fulcrum; 55: a second reflector; 56: and a fourth fulcrum.

Detailed Description

The following detailed description is made with reference to the accompanying drawings.

In order to overcome the defects of the prior art, the invention provides special paper for assisting drawing with a knife and an auxiliary device.

Example 1

The special paper for knife painting for assisting painting at least comprises a coated paper body and a photosensitive film. The surface of the coated paper body comprises at least one layer of photosensitive film. The photosensitive film may be coated when the coated paper leaves a factory, or may be coated by a coating device as needed after leaving the factory.

The photosensitive film can generate photosensitive reaction through light projected onto the photosensitive film, so that a contour line for drawing is formed and displayed within a period of time, the knife drawing personnel are assisted to pre-judge the position of the lower knife, and the difficulty of knife drawing is reduced.

The photosensitive film contains a photochromic substance. Photochromic refers to a compound A which is irradiated by light with a certain wavelength and undergoes photochemical reaction to generate a product B. The change in structure results in a significant change in the absorption spectrum in the visible portion, i.e., a color change. But can be restored to the original state under the irradiation of light with another wavelength (or under the action of heat).

Preferably, the photochromic component may be mixed in the raw material of the coated paper to form the coated paper capable of photochromism. For example, photochromic ingredients can be added to coating paints in coated paper production to form photochromic coated paper that is capable of reversible color change. The percentage range of the photochromic component is 5% -20%.

Preferably, the surface of the coated paper is coated with a photochromic solution and dried to form a coated paper containing a photosensitive film. The drying mode comprises natural drying at room temperature and professional drying.

Preferably, the component photochromic substances in the photosensitive film include at least photochromic substances spirooxazine and chitosan. The chitosan is a biological coupling agent, has good film-forming property, has a plurality of hydroxyl (OH-) and amino (NH2-) on the surface, can be in hydrogen bond combination with the hydroxyl on the surface of coated paper, and can be crosslinked with the group on the modified photochromic surface, such as OH-. After the chitosan and the modified photochromic substance are manufactured into a film, the film is combined with art paper, and the photochromic effect can be generated.

For example, the coated paper covered with the photosensitive film is irradiated by ultraviolet light, and the color of the coated paper gradually turns blue under the irradiation of the ultraviolet light along with the increase of the irradiation time, so that the color change effect is obvious. When the ultraviolet light disappears and only visible light remains, the color on the coated paper begins to gradually become lighter and finally disappears to be the original color.

Preferably, one of the ways of forming the spirooxazine-containing photosensitive thin film solution is as follows.

S1: uniformly mixing gamma-aminopropyltriethoxysilane, water and ethanol to obtain a modified solution, wherein the volume ratio of the gamma-aminopropyltriethoxysilane to the water to the ethanol is 1.5:6.0: 92.5;

s2: and (4) adding the photochromic substance spirooxazine into the modified liquid obtained in the step S1, stirring at the speed of 640-660 r/min, and mechanically stirring for 0.8-1.2 h to obtain the modified photochromic agent. Wherein the volume ratio of the photochromic substance spirooxazine to the modifying liquid is 1.0g:1.0 mL;

s3: preparing an acetic acid aqueous solution with the mass concentration of 2.0%, adding chitosan into the acetic acid aqueous solution, controlling the temperature to be 68-72 ℃, mechanically stirring uniformly, and filtering out insoluble substances to obtain a chitosan solution;

s4: and (4) mixing the modified photochromic agent obtained in the step (S2) with the chitosan solution obtained in the step (S3), controlling the stirring speed to be 800r/min, and mechanically stirring for 2h to obtain a photosensitive film solution. Wherein the concentration of the modified photochromic agent in the photosensitive film solution is 1.5 g/L-7.5 g/L.

The photosensitive film solution is mixed with the coating paint in the production process of coated paper according to a certain proportion to form the photosensitive coating. Photosensitive coating paint containing spirooxazine and chitosan is coated on two surfaces of the base paper. And performing calendaring on the base paper coated with the photosensitive coating to obtain the art paper capable of performing photochromism.

Preferably, the photochromic substance in the special paper for knife drawing can also be a photochromic Maya blue pigment.

For example, the formation principle of the photochromic Maya blue pigment is as follows: dissolving 0.1g of spiro [1,3, 3-trimethylindole- (6-nitrobenzdihydropyran) ] in 100mL of acetone, adding 10g of attapulgite treated at 300 ℃ under the condition of stirring for adsorbing at room temperature for 2h, grinding for 30min, adding 50mL of ethanol, 0.2g of potassium silicate and 2mL of ethylenediamine, continuing to react at room temperature for 15h, cooling to room temperature, filtering, washing with acetone, and drying at 90 ℃ for 3h to obtain the product.

The photosensitive change principle of the photochromic Maya blue pigment is as follows: a xenon lamp is used as a light source, an optical filter is used as an auxiliary material, and the photochromic Maya blue pigment has reversible conversion from colorless to red under the irradiation of ultraviolet light (365 nm) and from red to colorless under visible light (570 nm).

In the process of manufacturing the coated paper, the photochromic Maya blue pigment can be added into the coating paint of the coated paper to form photosensitivity. After the base paper is made, a coating paint containing a photochromic Maya blue pigment is coated on both surfaces of the base paper. And performing calendaring on the base paper coated with the photosensitive coating to obtain the art paper capable of performing photosensitive color change.

Preferably, the photochromic Maya blue pigment can be added into the film raw material to form a photosensitive film. And covering the surface of the coated paper with a photosensitive film to form the photochromic coated paper.

Or the photochromic Maya blue pigment can be added into coating paint in the production of coated paper to form photochromic reversible coated paper.

Preferably, the photochromic substance in the special paper for knife drawing can be selected as a near-infrared photosensitizer. The formation process of the near-infrared photosensitizer is as follows: reacting cinnamaldehyde and urea in an organic solvent at 180-220 ℃ for 6-12 h, centrifuging, dialyzing supernate, and drying to obtain carbon dots; activating the pheophorbide by an activating agent in an organic solvent to obtain activated pheophorbide; dispersing carbon dots in an organic solvent to obtain a carbon dot dispersion liquid; and dripping the carbon dot dispersion liquid into activated pheophorbide, reacting, centrifuging, dialyzing, and drying to obtain the near-infrared photosensitizer. The near-infrared photosensitizer turns blue and red under near-infrared illumination.

Preferably, the color of the special paper for knife drawing after color change is a color recognized by naked eyes, and the color change disappears after the color change time exceeds a limit. Preferably, the irradiation time of the color-changing light source can be 5 to 30 minutes.

In particular, when the photochromic substance in the paper for knife drawing is a compound with a recovery time of several hours, the line contour on the paper for knife drawing disappears after several hours. For example, when the recovery time of the photochromic substance is 1 hour, the line profile on the special paper for knife drawing becomes light and completely disappears after 1 hour.

For example, when the photochromic substance is rhodamine R2 whose recovery time is as long as one week, a pink line profile displayed by irradiation of ultraviolet rays can be developed on the paper exclusive for knife drawing for as long as one week and then gradually disappears.

Preferably, the surface of the special paper for knife drawing is further provided with at least one calibration mark for determining paper surface coordinates of the special paper for knife drawing. The calibration mark can be arranged on the edge of the special paper for knife drawing, and also can be arranged at other positions of the special paper for knife drawing. The number of the calibration marks is not limited, and the color is not limited.

Preferably, the scale mark may be a mark pattern having a coordinate origin and a coordinate axis, or may be a coordinate line displayed by a combination of a dotted line and a number. Preferably, the calibration mark is arranged at one corner of the edge of the special paper for knife drawing. After the knife drawing is finished, the calibration mark can be cut off, so that the drawing is more perfect.

Preferably, the calibration marking can be printed with a pigment containing a photochromic component. And displaying the calibration mark when the corresponding color-changing light source irradiates. The scaled logo is not displayed in a visible light environment.

Example 2

This embodiment is a further improvement of embodiment 1, and repeated contents are not described again.

The invention also provides a knife drawing auxiliary device for assisting drawing, which at least comprises a drawing acquisition unit 11, an image processing unit 14, at least one visible light source 12, at least one color-changing light source 13 and a light control assembly 15, as shown in fig. 2. The drawing acquisition unit 11 establishes an information connection relationship with the image processing unit 14, and the at least one visible light source 12, the at least one color-changing light source 13 and the light control assembly 15 respectively establish an information connection relationship to transmit information. The knife drawing auxiliary device also comprises a power supply device, and the power supply device can be a battery or a power line plug.

Specifically, the drawing acquisition unit is electrically connected with the acquisition circuit. The acquisition circuit is electrically linked to at least one power sensor that provides power to the visible light source and the color changing light source. The power inductor is electrically connected with the visible light source and the color-changing light source respectively. The visible light source and the color-changing light source are respectively transmitted to the special paper for knife drawing through the control of the light control assembly. Preferably, the visible light source and the color changing light source are light sources of a multi-source array.

The image processing unit can be one or more of an application-specific integrated chip, a processor and a server. To facilitate portability and downsizing of the auxiliary device, the image processing unit is preferably an application specific integrated chip.

The visible light source and the color-changing light source can be arranged independently or in a mixed array, and preferably, the visible light source is converted into the color-changing light source under the condition that a light source filter is added to the visible light source.

The drawing collection unit is used for collecting drawing drafts of the knife drawing author. The image processing unit is used for identifying lines in the drawing draft based on the drawing draft. Preferably, the drawing acquisition units are not limited to one, and may be two or more.

The light control assembly is used for controlling the color-changing light source to form an illumination image or an illumination track which is consistent with the drawing draft on the special paper for knife drawing according to the identified lines.

Because the special paper for knife drawing contains photochromic substances, under the irradiation of the color-changing light source, the special paper for knife drawing can form a photochromic outline which is the same as that of the drawing draft in a color-changing mode, so that a knife drawing writer can conveniently judge the position of the lower knife. The photochromic contour on the special paper for knife drawing can disappear gradually in a certain time, so that a certain knife drawing progress comparison time and thinking time can be reserved for a knife drawing author.

The drawing acquisition unit is an image acquisition component, such as a camera, a camera and the like, and can be used for shooting and acquiring or video acquiring the drawing draft.

In the drawing assistance device for assisting drawing according to the present invention, the method for recognizing a line contour in a drawing draft by an image processing unit includes:

according to the edge position and the trend of the line, the line contour of the image is extracted by utilizing edge detection and edge feature filtering, then different objects are identified according to the edge communication state and the inclusion relation, a circumscribed rectangle is made in the range of the color communication line by depending on color change information, and the range of the object is identified.

The visible light source is used for lighting and emitting visible light. The visible light source may be an LED lamp, hernia lamp, or the like.

The color-changing light source is preferably near infrared light harmless to human body, and can also be selected as ultraviolet light. When the ultraviolet light is set, the special paper is irradiated to the knife without irradiating human eyes. For the purpose of protecting human eyes, a protective cover for protecting human eyes can be arranged at the position around the color-changing light source so as to avoid damaging human eyes.

The visible light source and the color-changing light source can be provided with adjusting components for adjusting directions, so that the irradiation angle of the visible light source and the irradiation angle of the color-changing light source can be adjusted conveniently. The visible light source and the color-changing light source can be respectively and independently started or can be simultaneously started.

The light control assembly is connected with the adjusting assembly so as to control the irradiation direction of the visible light source and/or the color-changing light source. Preferably, the light control assembly is adjusted by light emitted from the color-changing light source so that the light is projected on the special paper for knife drawing according to a preset pattern.

Preferably, the drawing collection unit is further capable of recognizing the calibration mark by collecting an image of the special paper for drawing. The image processing unit determines the position, the placing angle, the main drawing area and the like of the special paper for knife drawing based on the collected calibration identification.

The image processing unit pre-irradiates the drawing line profile to the special paper for knife drawing based on the position, the placing angle and the main drawing area of the special paper for knife drawing. Preferably, the special paper for knife drawing can be pre-irradiated by colored visible light, so that the knife drawing writer can see the pattern of the drawing draft conveniently.

In the invention, the drawing draft is projected on the common copper plate paper by the colored visible light source, and partial auxiliary action can be realized. However, the colored visible light source is instantaneous and once the light is blocked, the line profile is not visible. During drawing, the hand and the blade of the knife-drawing author must block the projected light, so that the line contour of the drawing draft cannot be seen during drawing, which affects the attention and concentration of the knife-drawing author. Moreover, long-term illumination can rise the temperature around the coated paper, and influence is produced to the paper quality of coated paper, so that the drawing effect becomes poor.

Therefore, the line outline of the drawing draft is fixed on the special paper for knife drawing for a short time, so that a knife drawing author can concentrate on knife-carving drawing without being distracted, and the final improved aim of the invention is achieved. The special paper for knife drawing containing photochromic substances is combined with the auxiliary device to generate a transient color-changing drawing draft on the special paper for knife drawing, so that a knife drawing writer can concentrate on drawing and realize a real auxiliary effect.

Under the condition that the pre-irradiated drawing line profile is not matched with the ideal position of the knife drawing special paper, the knife drawing author can adjust the ideal effect by adjusting the position of the knife drawing special paper. In the case of determining the projection position, the knife drawing writer does not move the knife drawing special paper any more. And the image processing unit associates the calibration identification information of the special paper for knife drawing with the position of the projected drawing line profile after the time of fixing the position of the special paper for knife drawing exceeds the preset time, so as to determine the specific position information of the drawing line profile on the special paper for knife drawing. For example, after the position of the special paper for cutting has not moved for more than 1 minute, the image processing unit determines and stores the coordinate position of the drawing line profile.

The knife painting is different from other painting modes in that other painting modes can fix the painting paper to perform painting without moving, and the knife painting needs different hand forces for a knife painting author to cooperate with the use of a knife gesture in the painting process because the carving force of each knife is different, so that the paper special for knife painting cannot be completely fixed in the whole painting process and certainly can move locally. If the paper is fixed, the special paper for knife drawing may be damaged due to too large drawing force. When the auxiliary device repeatedly projects the drawing line contour on the special paper for knife drawing through the visible light source or the color-changing light source, the drawing line contour is projected at the same position all the time based on the calibration mark of the special paper for knife drawing, and the projection effect of the drawing line contour is not influenced even if the special paper for knife drawing is shifted. Therefore, the invention frees the two hands of the knife drawing writer by fixing the drawing line outline, and does not need the knife drawing writer to fix the special paper for matching the drawing line outline with the special paper for knife drawing. When the knife drawing writer needs, the auxiliary device is used for projecting the drawing line outline, and the special paper for knife drawing is only required to be placed in the projection range of the light source, so that the use is convenient.

Preferably, the light control component is capable of projecting a partial or partial line of the drawing line profile to the paper-specific for cutting based on an indication by the image processing unit.

After acquiring the drawing line profile of the drawing draft, the image processing unit may perform feature change on the line profile, for example, convert the line profile into a profile such as a solid line, a dotted line, or a dotted line.

The light control component can project line profiles of corresponding features to the special paper for knife drawing based on the profiles converted by the image processing unit. The advantage of so setting up lies in, can realize the simple deformation of the line profile of drawing the draft based on sword draws author's individual habit and needs, better assists sword to draw author's drawing creation.

Preferably, as shown in fig. 3, at least two rotatable mirrors reflect the color-changing light source on the special paper for knife drawing in a manner that at least one of the mirrors rotates at a set frequency, so that the color-changing light source can scribe a line outline on the special paper for knife drawing in a curved line.

As shown in fig. 3, the light control assembly includes: a movable mirror 41 for rapidly moving the spot. The plurality of movable mirrors are capable of forming various patterns of light spots on the paper specific for knife drawing. In the case of a moving mirror, the light spot of the light source moves as a function of the angle of the mirror at a set moment, thereby creating a pattern of light. For example, a raster pattern, a curvilinear pattern, or an elliptical pattern can be created by movement of the mirror.

As shown in fig. 4, the two mirrors 50 are freely rotatable at a first fulcrum 51 and a second fulcrum 52, respectively. The two mirrors 55 are free to rotate at a third pivot 54 and a fourth pivot 56, respectively. The light of the color-changing light source is projected on the first mirror 50, and the reflected light 53 based on the first mirror is projected on the second mirror 55. The first mirror 50 oscillates at a high frequency, for example 20KHZ, causing the raster pattern to move horizontally. The moving beam reflected by the first mirror 50 impinges on the second mirror 55 and the grating pattern is formed by the second mirror 55 moving at a relatively slow frequency, for example 60 KHZ.

The mirrors in the light control module have multiple sets. The first set of reflectors are configured to change the pattern characteristics of the color changing light source and the second set of reflectors are configured to change the pattern characteristics of the visible light source.

Preferably, the image processing unit is connected to at least one display key. The display key is used to select a display feature of the line profile, for example, whether the line profile is projected according to an actual line in the drawing draft or projected as a feature such as a solid line, a broken line, or a dot.

Preferably, the image processing unit is further capable of enlarging or reducing the line contour in the identified drawing draft at a preset scale, so that the color-changing contour projected on the cutting paper is reduced or enlarged.

Preferably, the temperature range of the visible light source and the color-changing light source projected on the special paper for knife painting is 25-35 ℃. The temperature is too high, so that the special paper for knife drawing is easy to deform, and the drawing effect in the knife drawing process is influenced. Therefore, the temperature of the light source projection on the paper dedicated for cutting needs to be controlled. Preferably, the auxiliary device is provided with at least one infrared temperature component for measuring the paper surface temperature of the special paper for the track bed within the projection range. And when the infrared temperature assembly detects that the temperature of the paper surface is higher than the limited temperature, temperature warning information is sent to the light control assembly. The light control assembly turns off the visible light source and/or the color changing light source based on the temperature alert information. Or the light control assembly turns off a part of visible light sources and/or lamp beads in the color-changing light source based on the temperature warning information so as to reduce the paper surface temperature of the special paper for cutting and drawing.

In order to further reduce the influence of the heat degree of the light source radiation on the special paper for cutting, the color-changing light source and the visible light source can be set as cold light sources. For example, the color-changing light source may be provided as an ultraviolet light-cooling light source capable of emitting ultraviolet light. The cold light source purple light LED has a spectrum range of long-wave ultraviolet UVA: wavelength of 400-320 nm, medium-wave ultraviolet UVB: the wavelength is 320-275 nm. Because the light emitting diode of the ultraviolet cold light source has small volume and low working temperature, the ultraviolet cold light source can be made into various shape structures with good plasticity, and is convenient for low-temperature irradiation of the special paper for knife drawing.

The use method of the auxiliary device comprises the following steps:

placing the drawing draft in the collection range of the drawing collection unit;

after the contour lines of the drawing draft are collected, placing the special paper for knife drawing in the light source irradiation range, and performing pre-projection of a visible light source;

adjusting the relative position of the pre-projected line profile and the special paper for knife drawing, and waiting for the auxiliary device to determine the calibration of the line profile after adjustment;

determining line characteristics projected by the line profile;

after calibration is finished, a color-changing light source of the auxiliary device is turned on, and the color-changing light source projects the line contour on the special paper for knife drawing, so that the special paper for knife drawing gradually shows the line contour in a photochromic mode;

and after the preset projection time is reached, the color-changing light source is turned off.

The line profile of the knife paper fades away within a defined time, for example, within a half hour or a week, until it disappears.

In the case where the calibration marks are printed with a pigment containing a photo-induced component, when the color-changing light source and the colored visible light illuminate the paper for special knife drawing simultaneously, the image processing unit can read the calibration marks through the drawing acquisition unit to determine the position information of the line outline of the drawing draft on the paper for special knife drawing. The advantage of so setting up lies in, after the sword painted author finishes drawing, need not cut out the part that contains the calibration sign, has saved a large amount of manufacturing cost to the factory of producing the special paper is painted to the sword, has saved the creation cost to the sword painted author, has also protected the environment.

It should be noted that the above-mentioned embodiments are exemplary, and that those skilled in the art, having benefit of the present disclosure, may devise various arrangements that are within the scope of the present disclosure and that fall within the scope of the invention. It should be understood by those skilled in the art that the present specification and figures are illustrative only and are not limiting upon the claims. The scope of the invention is defined by the claims and their equivalents.

The present specification encompasses multiple inventive concepts and the applicant reserves the right to submit divisional applications according to each inventive concept. The present description contains several inventive concepts, such as "preferably", "according to a preferred embodiment" or "optionally", each indicating that the respective paragraph discloses a separate concept, the applicant reserves the right to submit divisional applications according to each inventive concept.

Claims

1. A knife drawing auxiliary device for assisting drawing is characterized in that the device at least comprises a drawing acquisition unit (11), at least one visible light source (12), an image processing unit (14) and a light control component (15),

the image processing unit (14) identifies line profiles in the drawing based on the drawing draft collected by the drawing collection unit (11),

the light control component (15) controls the visible light source (12) to project light rays corresponding to the line contour on the special paper for knife drawing based on the line contour sent by the image processing unit (14), so that a line contour pattern consistent with the drawing draft is formed on the special paper for knife drawing.

2. Knife drawing assistance device to assist drawing according to claim 1, characterised in that it further comprises at least one colour changing light source (13),

under the condition that the special paper for knife drawing contains photochromic components, the light control component (15) controls the visible light source (12) to project light rays on the special paper for knife drawing according to the track corresponding to the line outline based on the line outline sent by the image processing unit (14), the special paper for knife drawing forms visible lines corresponding to the line outline of the drawing draft based on the reversible photosensitive reaction of the photochromic components and the photochromic light source,

and under the condition that the light of the color-changing light source (13) disappears and the color-changing recovery time is reached, the visible lines on the special paper for knife painting gradually change to disappear.

3. The knife drawing assisting device for assisting drawing according to claim 2, wherein the light control component (15) controls the visible light source (12) to project a line profile in a pre-projection manner on the special paper for knife drawing based on the line profile sent by the image processing unit (14),

after the standing time of the special paper for knife drawing exceeds the preset time, the image processing unit (14) records and stores the position information of the line contour based on the calibration mark on the special paper for knife drawing.

4. The device for assisting knife drawing of drawing according to claim 3, wherein the light control component (15) determines the projection position and/or projection trajectory of the color-changing light source (13) on the special paper for knife drawing based on the scaling mark on the special paper for knife drawing and the position information of the line outline transmitted by the drawing acquisition unit (11).

5. The knife drawing auxiliary device for assisting drawing according to claim 4, wherein the light control component (15) controls the working state of the visible light source (12) and/or the color-changing light source (13) based on the surface temperature and/or the temperature change of the special paper for knife drawing fed back by the infrared temperature component,

the light control component (15) adjusts the illumination intensity, illumination time, light source number or turns off the light source of the visible light source (12) and/or the color-changing light source (13) under the condition that the surface temperature and/or temperature change of the special paper for cutting and painting exceeds a preset temperature threshold value.

6. The knife drawing auxiliary device for assisting drawing according to claim 5, wherein the visible light source (12) and the color-changing light source (13) are independently distributed, and the visible light source (12) and the color-changing light source (13) are respectively connected with the corresponding light control components; and/or

The visible light sources (12) and the color changing light sources (13) are distributed in a staggered manner so that the visible light sources (12) and the color changing light sources (13) share the light control assembly.

7. The knife drawing assisting device for assisting drawing according to claims 1-6, wherein photochromic reversible photochromic components on the paper special for knife drawing are distributed on coating, and/or

8. The knife drawing assisting device for assisting drawing according to claim 7, wherein the photochromic reversible photochromic component on the paper dedicated for knife drawing does not develop color under irradiation of visible light.

9. The special paper for knife painting for assisting painting is characterized in that coating paint of the special paper for knife painting contains photochromic reversible photochromic components, and/or the special paper for knife painting is provided with photochromic reversible photochromic films,

under the condition that the color-changing light source (12) projects light rays to the special paper for knife drawing in a corresponding track according to the line contour of the drawing draft,

10. The special paper for knife drawing for drawing assistance according to claim 9, wherein at least one calibration mark that can be recognized by the knife drawing assistance device is provided on the special paper for knife drawing assistance, so that the knife drawing assistance device can determine a projection position and/or a projection trajectory of the color-changing light source projected onto the special paper for knife drawing based on the calibration mark.