JP5396027B2 - Stereoscopic prints - Google Patents

Description

  The present invention relates to a stereoscopic print using a lenticular lens sheet.

  Currently, many environments in which stereoscopic images can be viewed are large-scale and expensive systems. As the easiest method, stereoscopic image presentation by anaglyph method is often used (Patent Document 1). However, in this method, only different images are observed in each eye through dedicated glasses. Therefore, special glasses are required, and full color display becomes difficult. In addition, since images with different colors are formed between the left and right eyes and recognized as a three-dimensional image, it is easy to cause a visual field struggle and very easily get tired.

  Similar to the anaglyph method, a lenticular method is known as an inexpensive image presentation method (Patent Documents 2 to 4). The lenticular stereoscopic printed material includes a lenticular lens sheet in which lenticular lenses are arranged, and a stereoscopic image in which a multi-viewpoint image is processed into stripes and rearranged so as to correspond to the lenses.

However, with conventional lenticular stereoscopic prints, the image observed through the lenticular lens sheet uses the image that is normally observed as a stripe, and the stereoscopic effect cannot be obtained as expected. is there.
Japanese Patent No. 3579683 Japanese Patent Publication No.49-11940 Japanese Patent No. 2908799 JP 2006-251608 A JP 2007-251608 A

  An object of the present invention is to provide a printed material for stereoscopic viewing that provides a remarkable stereoscopic effect by the lenticular method.

A stereoscopic print according to the present invention includes a lenticular lens sheet including a plurality of lenses, and a stereoscopic image formed on a flat surface side of the lenticular lens sheet. but oblique direction with respect to the height axis of the object, and the three or more original images obtained by being observed from the viewpoint offset, created by computer graphics, trapezoidal distortion different from each other Three or more corrected images that have been subjected to correction processing including correction are processed into respective stripes, and one stripe is selected from each corrected image corresponding to the shooting position. The lenticular lens It is characterized by being arranged corresponding to a plurality of lenses of the sheet.

  The significance of trapezoidal distortion correction in this specification will be described later.

  In the present invention, the corrected image can be created by computer graphics. By using computer graphics, it is not necessary to take a photograph or capture a photographed image in a computer, and the manufacturing process can be simplified.

  In the present invention, as the stereoscopic image, three or more corrected images are processed into stripes, and one stripe is selected from each corrected image corresponding to the shooting position, corresponding to a plurality of lenses of the lenticular lens sheet. It is obtained by arranging them.

  The corrected image is a state in which correction processing including trapezoidal distortion correction is performed on each of three or more original images obtained by observing from a shifted viewpoint.

  The corrected image is a state in which the original image has been subjected to the correction processing, that is, correction processing including trapezoidal distortion correction. Specifically, the following method may be mentioned.

(1) A method of taking a photograph of an object (subject) from a shifted viewpoint, taking the photograph into a computer, and performing the correction process by image processing.

(2) A method of taking a photograph of an object (subject) from a shifted viewpoint and performing the correction process during development.

(3) A method of taking a photograph of an object (subject) as if the correction processing was performed by a technique at the time of shooting.

(4) A method in which an image of an object observed from a shifted viewpoint is created by computer graphics and the correction process is performed by image processing.

(5) A method of creating, with computer graphics, an image in a state where correction processing is performed on an image observed from a shifted viewpoint.

  Thus, it is only necessary to obtain a corrected image in a state where the original image has been subjected to the correction processing, that is, correction processing including trapezoidal distortion correction, and is not necessarily limited to a corrected image that has been subjected to correction processing after the original image is created. It is not a thing. That is, it is also included in the present invention to create a corrected image as in (3) and (5) above.

  For example, the following examples can be given as typical examples corresponding to the above (1) and (2).

  A lenticular lens sheet including a plurality of lenses; and a stereoscopic image formed on a flat surface side of the lenticular lens sheet. The stereoscopic image is obtained by photographing a subject from a shifted viewpoint. Three or more corrected images, each of which has been subjected to a correction process including trapezoidal distortion correction, are obtained by processing each of the corrected images into stripes, and each corrected image corresponds to a shooting position. A three-dimensional printed matter, wherein stripes are selected one by one and arranged corresponding to a plurality of lenses of a lenticular lens sheet.

  In the present invention, the corrected image is preferably an image observed from an oblique direction with respect to an axis in the height direction of the object at least in a state where the correction process is not performed. This is because, in the height direction, the stereoscopic effect is particularly emphasized, and it can be observed on the stereoscopic printed matter. In the present invention, the correction processing is preferably correction processing including trapezoidal distortion correction different from each other.

  This point will also be described in a later embodiment.

  ADVANTAGE OF THE INVENTION According to this invention, the printed material for stereoscopic vision which can obtain a remarkable three-dimensional effect by a lenticular system can be provided.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  In the lenticular stereoscopic printed material according to the present invention, it is assumed that an observer views an image with a depression angle from an oblique direction with respect to the plane of the printed material (phantogram). As a specific depression angle, a range of ± 35 ° is assumed around an angle of 45 ° with respect to the plane of the printed material. In addition, when such observation is performed by a lenticular method using a normal stereoscopic image, the smaller the depression angle from the observer, the longer the optical path length in the lens and the greater the parallax, which is expected. A stereoscopic effect cannot be obtained.

  In the present invention, as a stereoscopic image formed on the flat surface side of the lenticular lens sheet, correction including trapezoidal distortion correction is included in three or more original images obtained by observing the object from a shifted viewpoint. Three or more corrected images that have been processed are processed into stripes, and one stripe is selected from each corrected image according to the shooting position, and is associated with a plurality of lenses of the lenticular lens sheet. Therefore, a good stereoscopic image can be observed.

  Hereinafter, the stereoscopic printed material according to the present invention will be described in more detail.

  First, as shown in FIG. 1, three or more original images are prepared by photographing the subject 1 with a camera 2 from a viewpoint shifted in three or more horizontal directions with a constant height. The camera 2 has the same shooting conditions except that the viewpoint is shifted in the horizontal direction. The camera 2 is preferably a camera having the same performance. In this example, three original images 3 of A, B, and C are prepared as shown in FIG. 2 using three cameras 2 of A, B, and C as shown in FIG. At this time, taking a picture so as to look down from an obliquely upward direction with respect to the axis of the subject 1 in the height direction is advantageous in enhancing the height and giving a good stereoscopic effect.

  Next, correction processing including trapezoidal distortion correction is performed on the three original images 3 of A, B, and C, respectively, and three correction images 4 of A, B, and C are obtained as shown in FIG. Here, the significance of “keystone distortion correction” in this specification will be described. This means that the portion located on the back side of the object becomes narrow and trapezoidal, but this trapezoid is approximated to a rectangular shape. In other words, when taking an image of an object (subject) and obtaining an image, the image has a portion located on the back side of the object (subject) as shown in FIG. The image becomes narrower. A process of obtaining a corrected image shown in FIG. 3 by determining a reference point from the original image and bringing the trapezoidal portion of the image close to a rectangle around the reference point is called trapezoidal distortion correction. The reference point of the object (subject) can be set at an arbitrary position for the purpose of enhancing the height. In this example, an object (subject) with a cup placed on a table is used so that the explanation of the trapezoidal distortion correction is easy to understand. Focusing on the base part, the center of the lower end of the center cup is used as the reference point, and the length of the base in the width direction of this point is not changed, and the entire image is corrected so that the four corners of the base come close to a right angle. To process. By correcting so that the four corners of the base are right-angled, it is possible to obtain a stereoscopic print with high stereoscopic effect. However, if the stereoscopic effect is too strong, some observers may feel uncomfortable. In order to make the feeling moderate, the degree of correction may be suppressed.

  The correction process including the trapezoidal distortion correction means that only the trapezoidal distortion correction may be performed, or a correction such as horizontal movement may be performed in addition to the trapezoidal distortion correction. In this way, by performing correction processing including trapezoidal distortion correction on the original image 3, it is advantageous to enhance the height and give a good stereoscopic effect.

  Note that the correction processes including the keystone correction performed on the three original images 3 of A, B, and C may be different from each other. That is, the degree of correction described above may be varied. In this way, the height is reduced in some of the corrected images, and the observer feels uncomfortable, and the height enhancement is reduced when the burden on the head and eyes increases to recognize it as a solid. On the other hand, in some corrected images, height enhancement can be increased when it is desired to enhance the height more.

  Next, the three corrected images 4 of A, B, and C are processed into stripes to obtain a stripe image 5 as shown in FIG. Then, as shown in FIG. 5, one stripe is selected from the stripe image 5 of each of the corrected images 4 of A, B, and C corresponding to the shooting position, and corresponds to a plurality of unit lenses of the lenticular lens sheet 20. The stereoscopic image 10 thus arranged is prepared. In FIG. 5, stripes are selected and arranged from the stripe images 5 of the three corrected images 4. Although there are many arrangement methods, an example will be described. 4A are named A1, A2, A3,..., An from the left, and B, C image stripes are similarly B1, B2, B3,. Bn and C1, C2, C3,. The image of the first lenticular lens portion from the left in FIG. 5 is composed of A1, B2, and C3 stripes, and the second from the left is composed of A2, B3, and C4 stripes. There is a method of shifting the stripes one by one.

  When the observer sees the stereoscopic printed matter of FIG. 5 obtained in this way from an obliquely upward direction with respect to the plane of the printed matter, a good stereoscopic image can be observed.

  A process corresponding to obtaining the original image 3 by photographing the subject 1 with the camera 2 as shown in FIG. 1 can also be created by computer graphics.

  FIG. 1 shows a case where the subject 1 is normally photographed. That is, as shown in FIG. 6A, the camera 2 is installed in an oblique direction with respect to the subject 1, and the imaging plane S and the projection plane T of the camera are photographed as a plane perpendicular to the lens base line L. At this time, an original image 3 as shown in FIG. 6B is obtained.

  On the other hand, an image corresponding to a corrected image subjected to trapezoidal distortion correction may be obtained by a technique at the time of shooting. That is, as shown in FIG. 7A, the camera 2 is installed in an oblique direction with respect to the subject 1, and the imaging surface S and the projection surface T of the camera are tilted from the vertical plane with respect to the lens base line L and photographed. At this time, a corrected image 4 as shown in FIG. 7B is obtained. It can be said that it is a photography technique similar to a kind of tilt photography. Also in this case, a process corresponding to photographing of the subject 1 as shown in FIG. 7A can be created by computer graphics.

  In FIG. 5, the stripes corresponding to the unit lenses of the lenticular lens sheet 20 are arranged in the order of A, B, and C as in the original image shooting position. However, a part of the stripe is defined as the original image shooting position. You may arrange in the order of reverse C, B, and A. This is due to the following reasons. That is, in a certain region of the image viewed by the observer, the equivalent optical path length t of the light beam in the lenticular lens sheet 20 is just on the surface of the stereoscopic image 10 as shown in FIG. Focusing, the observer observes an upright image. However, in another region of the image viewed by the observer, the equivalent optical path length t ′ of the light beam in the lenticular lens sheet 20 becomes longer as shown in FIG. (Mirror image) may be observed. If such a state is left as it is, the inverted image (mirror image) becomes noise, and a good stereoscopic image cannot be observed. Therefore, in an area where the observer is expected to observe a reverse image (mirror image), the stripes may be arranged in the reverse order of the shooting position of the original image to make a reverse image (mirror image) in advance. In this way, it can be avoided that a reverse image (mirror image) becomes noise and a good stereoscopic image cannot be observed.

  In addition, as another method for avoiding the reverse image (mirror image) from becoming noise as described above, an image in which the stripe is turned over can be used instead of rearranging a part of the stripe. That is, taking the image of the leftmost lenticular lens portion in FIG. 5 as an example, the left and right sides of the image A can be reversed, that is, the reversed image can be used with the length direction of the stripe as the axis. . By performing such inversion with the length direction of the stripe as the axis for all stripes, or for the part where the image inversion affects the observation, the entire image is not felt by the image inversion. Can be observed.

The perspective view which shows the state which image | photographed the to-be-photographed object in this invention. The top view which shows the original image which concerns on this invention. The top view which shows the correction | amendment image which concerns on this invention. The top view which shows the stripe image which concerns on this invention. Sectional drawing which shows the printed matter for stereoscopic vision which concerns on this invention. FIG. 4 is an explanatory diagram showing a state where a subject is normally photographed in the present invention and a plan view showing an obtained original image. FIG. 3 is an explanatory diagram showing a state where a subject is photographed in the present invention and a plan view showing an obtained corrected image. Sectional drawing which shows the equivalent optical path length of the light ray in the lenticular lens sheet in the printed matter for stereoscopic vision which concerns on this invention.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Subject, 2 ... Camera, 3 ... Original image, 4 ... Correction image, 5 ... Stripe image, 10 ... Stereoscopic image, 20 ... Lenticular lens sheet

Claims (1)

A lenticular lens sheet including a plurality of lenses, and a stereoscopic image formed on the flat surface side of the lenticular lens sheet,
The stereoscopic image is created by computer graphics on three or more original images obtained by observing the object obliquely with respect to the height axis of the object and from a shifted viewpoint. The three or more corrected images that have been subjected to correction processing including different keystone distortion corrections are processed into stripes, and 1 corresponding to the shooting position is obtained from each corrected image. A printed matter for stereoscopic viewing, wherein stripes are selected one by one and arranged corresponding to a plurality of lenses of the lenticular lens sheet.

Images