KR100980360B1 - Method for forming and detecting hidden images using lenticular lense sheet - Google Patents

Abstract

PURPOSE: A method for forming and detecting hidden images using a lenticular lens sheet is provided to easily detect a hidden image using a lenticular lens sheet. CONSTITUTION: A method for forming and detecting hidden images using a lenticular lens sheet comprises the following units. An image(100) in which a background and an identification image are inverted is formed. The second pattern(42) in which the second scanning line is formed in the same direction as the first scanning line is formed in an inverted image. The second scanning line has the same thickness and interval as the first scanning line. A hidden image is formed by overlapping the first and second patterns around an identification image to hide the first and second scanning lines. A hidden image is detected by overlapping a pitch in which a hidden image is printed with a lenticular lens sheet which satisfies the sum of thicknesses of the first and second scanning lines.

Description

FIELD OF FORMING AND DETECTING HIDDEN IMAGES WITH LENTIC LENS SHEET {METHOD FOR FORMING AND DETECTING HIDDEN IMAGES USING LENTICULAR LENSE SHEET}

The present invention relates to a hidden image formation and detection method using a lenticular lens sheet.

Hidden images are those which are sold or donated to a specific person in a form that cannot be seen by a user, and thus, hidden contents can be identified according to a predetermined procedure, and technology for providing such hidden images has become very popular in recent years.

A representative example of hidden images is instant lottery tickets. Instant lottery is a form of identifying hidden contents by coating specific information with silver foil and removing silver foil using the side of coins. Such a hidden image is also applied to the advertising and promotion strategy a lot, such a hidden image is often used in prizes, coupons, and the like.

More recently, hidden images using saturation and lightness have been provided. As an example, U.S. Patent No. 5,984,367, entitled "Hidden Image Game Piece," printed onto a transparent or translucent substrate in a form that is difficult to identify specific information by saturation and lightness, Techniques for identifying hidden information by lightening are disclosed.

However, this conventional technology has a disadvantage in that the medium containing the hidden image is supplied to the user, so that the medium containing the hidden image is used only for single use.

In addition, the conventional hidden image formation and detection as described above has been mainly made with the main motif to cause visual illusion, such as varying the brightness and saturation of the background and image, or to make the background or image composed of fine and complex patterns or symbols. There is a limit.

The lenticular lens sheet is a lens sheet in which a hemispherical lens having a width of 20 LPI to 200 LPI is embossed. The lenticular lens sheet is applied to screens and 3D TVs for viewing 3D stereoscopic images or multi view images. do.

SUMMARY OF THE INVENTION An object of the present invention is to provide a method of easily forming a hidden image which is not identified by the naked eye and easily detecting the hidden image by placing a lenticular lens sheet on the printing surface of the hidden image.

As an example for achieving the above object, the present invention, the process of forming an identification image distinguished from the background and overlapping the background, and forming a first pattern in which the first scanning line is formed in the horizontal or vertical direction of the background and the identification image ; Forming an image in which the background and the identification image are inverted, and forming a second pattern in which the second scan line having the same thickness and interval as the first scan line is formed in the same direction as the first scan line; Forming a hidden image by overlapping the first pattern and the second pattern around the identification image so that the first scan line and the second scan line are covered; And overlapping the lenticular lens sheet on the printed image of the hidden image to detect the hidden image.

In the lenticular lens sheet, it is more preferable to use a lenticular lens having a length of the sum of the thicknesses of the first scan line and the second scan line as the lens pitch to detect a clear three-dimensional image.

According to the present invention described above, a hidden image that is not visually identified can be formed by a simple method of inverting the image and the scanning line, and the hidden image can be easily formed using the lenticular lens sheet manufactured to match the scanning line formed in the hidden image. A detectable effect can be expected.

Particularly, according to the present invention, a hidden image may be printed on the ground or a film, or a two-dimensional image formed on an image output means such as a computer monitor or a PDA terminal may be expected to be a three-dimensional image. It can be applied to various fields such as advertising, learning, etc.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings, and the present invention is not limited to the following drawings and examples.

Prior to this, terms or words used in the specification and claims should not be construed as having a conventional or dictionary meaning, and the inventors should properly explain the concept of terms in order to best explain their own invention. Based on the principle that can be defined, it should be interpreted as meaning and concept corresponding to the technical idea of the present invention.

First, a process of forming a first pattern in which an identification image distinguished from a background is overlapped with a background and a first scan line is formed in a horizontal or vertical direction of the background and the identification image.

1 is a diagram illustrating that the background 20 and the identification image 10 are formed to be distinguished. As long as the background 20 and the identification image 10 can be visually distinguished, any distinction means may be applied, and the background 20 and the identification image 10 may be distinguished from each other by a color difference, a brightness difference, It is formed so that it can be distinguished visually by other means such as saturation difference. In FIG. 1, the background 20 and the identification image 10 are distinguished by color differences for convenience of description, but it should be understood that the present invention is not limited thereto.

A scanning line is formed parallel to the horizontal direction of the figure in which the background 20 and the identification image 10 as shown in FIG. 2 are formed. The scan line is a line for decomposing the image formed by the background 20 and the identification image 10 in a predetermined direction. When the scan line is formed in the vertical direction, the image formed by the background and the identification image is decomposed in the vertical direction.

The scan line may be formed in a constant direction in the horizontal or vertical direction, and the thickness and spacing of the scan line may be kept constant. As shown in FIG. 2, the base 20 and the identification image 10 are formed at the position where the scan line is formed, and the thickness of the scan line is set so that the area of the portion where the scan line is formed and the portion where the scan line is not formed are substantially the same. .

When the number of scanning lines is large and thin, it is suitable for short distance, and when the number of scanning lines is small and thick, it is suitable for long distance. You need to adjust

The scan line illustrated in FIG. 2 is referred to as a first scan line 30 for convenience, and the pattern on which the first scan line 30 is formed is referred to as a first pattern 40 for convenience. When the number of the first scan lines 30 is n, the portions where the first scan lines 30 are not formed are also formed as n, and the first scan lines 30 erased by the scan lines as shown in FIG. 2. The portion and the scan line are not formed so that the remaining first pattern 40 shows almost the same area.

Secondly, the background 20 and the identification image 10 form an inverted image, and the second scan line 32 having the same thickness and spacing as the first scan line 30 is the first scan line in the inverted image. It is a process of forming the second pattern 42 formed in the same direction as 30.

FIG. 3 illustrates an inverted image 10 'formed by inverting the background 20 and the identification image 10 shown in FIG.

1 and 3, the shape and size of the identification image 10 are the same, but the color corresponding to the identification image 10 in FIG. 1 is the inverted background 20 ′ of FIG. 3 and the background ( By making the color corresponding to 20) into the inverted image 10 'of FIG. 3, the background 20 and the identification image 10 are inverted and displayed.

As described above with reference to FIG. 1, the background 20 and the identification image 10 may be inverted to form an inverted image 10 ′, as long as it can be visually distinguished. The means may also apply any means.

That is, although FIG. 3 inverts the colors of the background 20 and the identification image 10 based on FIG. 1, inversion using other means is also possible.

As shown in FIG. 3, a scan line is formed in the inverted image 10 ′. 4 is a scanning line formed on the image of FIG. The scan line shown in FIG. 4 is named the second scan line 32 for convenience and distinguished from the first scan line 30 of FIG. 2, and the pattern on which the second scan line 32 is formed is named the second pattern 42 for convenience. It was.

When the second scan line 32 shown in FIG. 4 and the first scan line 30 shown in FIG. 2 are compared, the thickness of each scan line is the same, but the first scan line 30 and the second scan line 32 are the same. It can be seen that the difference remains in the formed position.

That is, when the first scan line 30 is formed in n columns, the second scan line 32 is formed in n ± 1 columns. Looking at the second pattern 42 shown in FIG. 4 in detail, unlike the first pattern 40 shown in FIG. 2, it can be seen that the portions erased by the scan lines are different.

Third, the hidden image 100 is overlapped with the first pattern 40 and the second pattern 42 around the identification image 10 so that the first scan line 30 and the second scan line 32 are covered. Forming process.

FIG. 5 illustrates an image printed by overlapping the first pattern 40 of FIG. 2 and the second pattern 42 of FIG. 4, wherein the first pattern 40 and the second pattern (refer to the identification image 10). When overlapping printing 42, it can be seen that the first scan line 30 and the second scan line portion 32 are covered by the pattern. That is, as shown in FIG. 5, an image corresponding to 50% of the image of FIG. 1 and the image of FIG. 3 are mixed and overlapped to form a desired hidden image 100.

In FIG. 5, an arbitrarily given identification image "A" is visually identified, but this is provided to explain the technical configuration of the present invention, and is made by increasing the thickness of the scanning line. At this time, if the thickness of the scan line is made smaller, the color of the colors constituting the background 20 and the identification image 10 can be seen by the naked eye.

If the thickness of the scan line is adjusted very thin, the identification image cannot be visually identified. The thickness of the scan line may be adjusted in consideration of the size of the identification image, but is not limited, and the thickness of the scan line may be preferably adjusted in the range of 175 DPI to 900 DPI in consideration of hidden image formation and detection and productivity of the corresponding lenticular lens sheet. .

Fourth, the hidden image is detected by superimposing a lenticular lens sheet on the printed image.

The image on which the hidden image is printed may be an image formed on various image output means such as a surface, a film, or a computer monitor or a PDA terminal.

In the present invention, the hidden image 100 is detected using a lenticular lens sheet. 6 shows a schematic view of a side surface of an example lenticular lens sheet which can be applied to the present invention.

The lenticular lens sheet 50 may be formed of a transparent plastic material, and it is preferable to use one having a refractive index in the range of 1.45 to 1.60. Although not limited, specifically, for example, a transparent thermoplastic material having a refractive index of about 1.49 to 1.58 and a urethane acrylate, an epoxy acrylate, an ester acryl, such as polycarbonate, polymethyl methacrylate, polyester, polyvinyl chloride, polystyrene, etc. Curable resins having a refractive index of about 1.45 to 1.60 such as a rate may be used alone or in combination of two or more thereof.

As shown in FIG. 6, the lenticular lens sheet 50 can more precisely control the refractive index when the filling layer 60 is formed on the surface of the lens, and protect the surface of the lenticular lens 52. It is more preferable as it can. The material constituting the filling layer 60 has a lower refractive index and a transparent material than the material constituting the lenticular lens 52.

The material constituting the filling layer 60 is a resin in a liquid state at room temperature so that the desired refractive index can be easily combined by mixing the high refractive resin and the low refractive resin to finely control the performance of the lenticular lens 52. It becomes possible. As the material of the filling layer 60, a transparent and photocurable acrylate-based liquid resin is most preferable, but thermosetting resins such as epoxy, urethane, and silicone may be used.

Specifically, it is preferable to use a refractive index difference of the material constituting the lenticular lens 52 and the refractive index difference between the material constituting the filling layer 60 is larger than 0.05. If the difference in refractive index is less than or equal to the above range, even if the focal length is reduced by adjusting the depth d of the lenticular lens 52, the focal length of the entire filling layer is not sufficiently shortened, so that the viewing distance L becomes too far and the stereoscopic image This distorted image cannot be observed.

The lenticular lens sheet 50 is advantageous in obtaining a clear image by adjusting the length of the lens pitch p to be the sum of the thicknesses of the first scan line 30 and the second scan line 32.

The larger the thickness of the scan line, the larger the lens pitch of the lenticular lens sheet, and the larger the lens pitch, the larger the identification image. Therefore, the size and the lenticular lens sheet should be prepared according to the use of the identification image.

The hidden image 100 may be detected by a simple operation of superimposing the lenticular lens sheet 50 on the printed image to form a scan line, and the detected hidden image 100 may be three-dimensional. Appears as an image.

FIG. 7 is a schematic diagram illustrating a three-dimensional image forming principle of a lenticular lens sheet. In FIG. 7, x represents left eye information and y represents right eye information. The first pattern 40 and the second pattern 42 forming the hidden image of the present invention correspond to left eye information or right eye information, respectively. The detected hidden image 100 may be obtained as a 3D stereoscopic image.

Unlike the conventional hidden image formation and detection, the hidden image formation and detection method using the lenticular lens sheet of the present invention can check the hidden image repeatedly by a simple method of touching and detaching the lenticular lens sheet onto the printed image. It shows the advantage because the hidden image is formed into a three-dimensional image.

Hidden image formation and detection method using the lenticular lens sheet of the present invention can be widely applied to a variety of fields that require a hidden image, especially when applied for learning purposes will be greatly contributed to improve the learning efficiency.

The present invention described above is not limited to the above-described embodiment and the accompanying drawings, and various substitutions, modifications, and changes are possible within the scope without departing from the technical spirit of the present invention. It will be evident to those who have knowledge of.

1 is a diagram in which a background and an identification image are overprinted.

FIG. 2 is a first pattern in which scan lines are formed in the figure of FIG. 1.

3 is a view inverted to the figure of FIG.

4 is a second pattern in which scan lines are formed in the diagram of FIG. 3.

5 is a diagram in which a hidden image is formed by overlapping a first pattern and a second pattern.

6 is a schematic view showing a cross section of the lenticular lens sheet.

7 is a schematic diagram illustrating a principle of forming a 3D image of a lenticular lens sheet.

[Description of Major Symbols in Drawing]

10: identification image 20: background 10 ′: reverse image 20 ′: reverse background

30: first scanning line 32: second scanning line

40: first pattern 42: second pattern 100: hidden image

50 lenticular lens sheet 52 lenticular lens 60 filling layer

p: Lens pitch d: Lens depth L: Viewing distance

Claims (3)

Forming an identification image distinguished from a background and overlapping the background, and forming a first pattern in which a first scanning line is formed in a horizontal or vertical direction of the background and the identification image; Forming an image in which the background and the identification image are inverted, and forming a second pattern in which the second scan line having the same thickness and interval as the first scan line is formed in the same direction as the first scan line; Forming a hidden image by overlapping the first pattern and the second pattern around the identification image so that the first scan line and the second scan line are covered; And Detecting a hidden image by superimposing a lenticular lens sheet whose pitch satisfies the sum of first and second scan line thicknesses on the printed image; Hidden image formation and detection method using a lenticular lens sheet comprising a. The method according to claim 1, And a thickness of the first scan line and the second scan line is in a range of 175 DPI to 900 DPI. delete

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