RU2129725C1 - Method for production of stereo raster photos - Google Patents

Abstract

FIELD: stereoscopy. SUBSTANCE: method involves generation of parallax charts using images in left and right frames of stereo pair, and positioning said parallax chart in constant distance from raster. Images in left and right frames are produced in digital form, for example, using electronic digital stereo camera. Then method involves splitting resulted frames into vertical bands which width is equal to width of linear raster step, generation of parallax chart on transparent or dull substrate using alternation of, for example, even strips on image of left frame into corresponding even strips of right frame. Frames of stereo pair and parallax chart are produced using computer and color printer. Linear raster is produced on separate transparent substrate using black-and-white printer and computer. EFFECT: facilitated manufacturing of stereo images, possibility of their personal production. 4 cl, 5 dwg

Description

 The invention relates to stereoscopy, and in particular to methods for obtaining stereoscopic photographs.

 A known method of obtaining stereoscopic raster photographs (Valius N. A., Stereoscopy, Academy of Sciences of the USSR 1962, p. 173-185), which consists in the formation of paralaxograms on a flat substrate, which is a photo paper from the images of the left and right frames of a stereo pair. A parallaxogram is formed by projecting images using an enlarger through a lens-film, placed on color photo paper.

 The disadvantage of this method of obtaining stereo photographs is the need to use a special lens-film and a complex photographic process for processing color photo paper.

 There is also a method of obtaining stereoscopic raster photographs (Valyus N.A. Raster optics. -M-L; State Publishing House of Technical and Theoretical Literature, 1949, p. 192-193), which consists in forming paralaxograms on the images of the left and right frames stereopairs and placing this parallaxogram at a constant distance from the raster. The raster used in this method is a set of light-absorbing vertical strips of equal width in width, separated from each other by equal width slits.

 The disadvantage of this method of obtaining stereoscopic raster photographs is the need to use a complex photographic process for processing color photo paper after contact or projection photo printing of the left and right frames of a stereo pair on this photo paper.

 The objective of the image is to simplify the technology for obtaining color stereo photographs and provide the possibility of their individual production.

 The technical result is the creation of technology for obtaining color stereo photographs using modern means of digital computing.

 The technical result is achieved by the fact that in the method for obtaining stereoscopic raster photographs, which consists in forming a paralaxogram on the images of the left and right frames of a stereopair on a flat substrate and placing this parallaxogram at a constant distance from the raster, the image of the left and right frames of the stereopair is obtained in digital form, for example, using an electronic digital stereoscopic camera. The resulting images are divided into vertical stripes, equal in width to the slit of the linear raster, and a parallaxogram is formed on a transparent or matte substrate by replacing the stereo pair in the image of the left frame, for example, even stripes with even numbers of the right frame of the stereo pair corresponding in numbers. The stereopair is divided into separate bands of images of the left and right frames using a computer. The formation of parallaxograms on a substrate is carried out using a color printer and a computer. Moreover, a linear raster is made on a separate transparent substrate using a black and white printer and computer.

 In FIG. Figure 1 shows the splitting of the left and right frames of a stereo pair into vertical stripes.

 In FIG. 2 shows the formation of a parallaxogram on a flat substrate.

 In FIG. 3 shows a general view of a linear raster.

 In FIG. 4 shows the layout of the basic elements of stereo photography.

 In FIG. 5 shows a stereo photograph in section.

 In FIG. 1 are designated: L and P (Fig. 1) positive digital images of the left and right frames of the stereo pair and the result of dividing the images of the left and right frames of the stereo pair, respectively, into vertical stripes 1-L. 2-L. . . i-L. .. and 1-P, 2-P, ..... i-P .. with a width δ equal to the width of the slit of the linear raster.

 In FIG. 2 are indicated: parallaxogram-1 with images of vertical stripes of the left i-L and right (i + 1) P frames of a stereo pair, a flat transparent or matte substrate - 2.

 In FIG. 3 are indicated: 1 - transparent flat substrate of the raster with opaque strips 2 located at a distance δ from each other, which determines the slit width of the linear raster.

 In FIG. 4 and 5 are indicated: a transparent or opaque substrate 1 with a paralaxogram 2, a transparent substrate 3 with opaque stripes 4 rasters, a plate 5 of constant thickness from a transparent plastic mass or glass, protective transparent plates 6 and 7; IL - i -th left and (i + 1) P- (i + 1) -th right vertical parallaxogram stripes.

 A method of obtaining stereoscopic raster photographs is implemented as follows. Using an electronic digital stereoscopic camera, the subject is captured. Receive a positive digital image of the left and right frames of the stereo pair and enter this digital information into the computer. Using a computer, digital images of the left and right frames of a stereo pair are divided into vertical stripes iL and iP, equal in width to the slots of the linear raster (Fig. 1). Then, using the appropriate program, the computer replaces all the even bands in the image of the left frame of the stereo pair with the corresponding even numbers of the right frame of the stereo pair. Replacing the exclusive image bands of the left frame of a stereo pair with the image bands of the right frame of a stereo pair can vary widely depending on the artistic tasks of stereo photography. The result of these transformations, which is the digital equivalent of a parallaxogram, is recorded in the computer's memory, and then using a computer and a color printer on a transparent or opaque substrate (Fig. 2), a color parallaxogram is formed 1. In addition, a black-and-white printer and a computer are made using the appropriate program by printing on a transparent substrate 1 (Fig. 3) a linear raster, the distance between the printed opaque (for example, black) stripes 2 of which is equal to δ (slot width). After receiving the parallaxogram 2 on the substrate 1 and the linear raster 4 on the transparent substrate 3, they are placed on both sides of the plate 5 (Figs. 4 and 5) of transparent plastic mass or glass of constant thickness and fixed using plates 6 and 7 in this position, at wherein the mutual arrangement of the linear raster strips and the parallaxogram bands provides the possibility of observing from the side of the plate 7 (Fig. 5) a three-dimensional image of the subject.

 The separation of the images of the left and right frames of the stereo pair is provided by a linear raster (Fig. 6) due to the possibility of separate observation by the left and right eyes of the bands iL and (i + 1) P belonging respectively to the left and right frames of the stereo pair.

 The thickness of the plate 5 is selected depending on the required viewing distance of the stereoscopic image.

 The verification of the method for obtaining stereoscopic raster photographs was carried out using a digital electronic camera such as "SONYDSC-F1", a personal computer of the type IBM Intellistation Z Pr, and a color printer of the type "HP Desk Jet 720C".

 Using an electronic digital camera, a stationary object was shot from two positions separated by 65 mm horizontally from each other.

 A parallaxogram and a raster were formed on a transparent film of the type “HP C3832A.” Verification fully confirmed the possibility of obtaining stereo photographs by the proposed method.

The advantage of the proposed method is:
- the ability to produce both serial and individual color stereo photographs;
- the ability to produce stereo photographs almost completely using modern hardware and software digital computing;
- the possibility of using a computer the formation of various optical effects when receiving stereo photographs.

 - ease of implementation;

Claims (4)

 1. A method of obtaining stereoscopic raster photographs, which consists in forming a parallaxogram on the images of the left and right frames of the stereopair and placing this parallaxogram at a constant distance from the linear raster, characterized in that the images of the left and right frames of the stereopair are obtained in digital form, for example, using an electronic digital stereoscopic camera, the resulting images are divided into vertical stripes equal in width to the width of the slit of a linear raster, and parallax a gram is formed by replacing a stereo pair in the image of the left frame, for example, even bands with the corresponding even numbers of the right frame of the stereo pair.  2. The method according to claim 1, characterized in that the division of the image of the left and right frames of the stereo pair into vertical stripes is carried out using a computer.  3. The method according to claim 1, characterized in that the formation of the parallaxogram is carried out using a color printer and a computer.  4. The method according to claim 1, characterized in that the linear raster is made on a separate transparent substrate using a black and white printer and computer.

Images