Method and equipment for printing 3-D stereograph

Details Method and equipment for printing 3-D stereograph Method and equipment for printing 3-D stereograph

1994-02-28

1996-03-19

Gellner, Michael L.

Photocopying

Projection printing and copying cameras

Stereoscopic

G03B 2732

Patent

active

055007120

DESCRIPTION:

BRIEF SUMMARY
TECHNICAL FIELD

This invention relates to methods and apparatuses for printing of three dimensional (3D) photographs. More particularly, the invention relates to means for executing exposure control and exposure-position rectification in methods and apparatuses for printing of three dimensional (3D) photographs, in accordance with the differences in spacial parallax.


BACKGROUND ART

As a general method for preparing 3D photographs, there is the indirect method in which a multiple of negatives are prepared in advance for a single object, that has a depth and that comprises a principal object, a foreground and background, using a camera containing more than three lenses, the negatives being repetitively printed for more than three times onto a photosensitive sheet containing a lenticular sheet and the photographic angle being changed for each negative.
FIG. 1 illustrates the 3D photographic method. The figure shows the case of a triple-lens camera consisting of the lenses 1, 2 and 3, in which the arrows marked with L and L' show the spans between the observation points while X and Y show respectively the parallaxes between the principal object 5 and background 4 and the principal object 5 and foreground 6.
For instance, if the principal object 5 and background 4 are compared, there are parallaxes of -X on the first print, 0 on the second print and +X on the third print for each of the photographing stations. If the principal object and foreground are compared, there are parallaxes of +Y on the first print, 0 on the second print and -Y on of the third print. Negatives that have different positions of the images of the principal object, foreground and background are prepared from the photographing stations that are located either on a straight line parallel to the object or a line drawn through the center of the object.
The prepared negatives are projected and printed onto a photosensitive lenticular sheet, which consists of a sheet that acts as a lenticular lens and that is coated on the back side with a photosensitive material, from the side of lenticular lens in the order of photographic stations starting from one negative frame to the end of other frames.
When printing is to be done, a part of the principal object is selected as the key-subject, and exposure is executed with positions adjusted so that the key-subject for the images in each negative are coincident. If printing is done with the photographic angle changed for each negative, the images in each negative become separated into a band pattern by the lenticular lenses, and an image band that has a width in proportion to the photographic angle is repetitively arranged in correspondence with the photographic direction.
The formation of a three dimensional image is explained considering as an example the case of a 3D photograph, which was prepared by a single exposure, one each of the 3-frames of a negative being pictured with a triple-lens camera for 3D use. FIG. 2 illustrates an example of a conventional 3D photograph.
The image band formed on the photosensitive layer as shown in the figure is expanded sideways by the lenticular lens and will be seen as a restored image, and different restored images of the two image bands corresponding to different photographic stations will reach the left and right eye of an observer. A three dimensional view is obtained from the superimposition of different image information reaching the left and right eyes of the observer.
In the figure, the right eye receives the image 2 in the center while the left eye receives the image 1 on the right. The image band 2 covers 9.degree. while the image bands of 1 and 3 each covers 7.degree. of the filed of view, and the three dimensional view is obtained in the 23.degree. viewing region in front of the 3D photograph.
The three dimensional effect will differ depending on which photographic station corresponds to the negative, the restored images of which will reach the left and right eyes of the observer. In the event when the photographic stations are different, namely when

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