Browse Prior Art Database

STEREO IMAGING USING A DUPLEX LASER PRINTER

IP.com Disclosure Number: IPCOM000026562D
Original Publication Date: 1992-Oct-31
Included in the Prior Art Database: 2004-Apr-06
Document File: 4 page(s) / 164K

Publishing Venue

Xerox Disclosure Journal

Abstract

A method for generating stereo output using a laser printer and a transparent receiving sheet is disclosed. The printer must have duplex imaging capability for the method to be compatible with black or color printers. Figure 1 shows a stop array technique, which is an amenable configuration for use with laser printers. The technique uses stop array 2 to restrict viewing of image plane 4 so that only left eye views (L) are seen from some locations and right eye views (R) are seen from other location. The stop array technique uses a transparency 5 with stop array 2 on front surface 6 and complex image 4 on back surface 8. Complex image 4 consists of alternating parts of an image for left eye view (L) and other parts for right eye view (R). Eyes 10 and 12 view in stereo since each eye views only what is in its respective line of sight 14 or 16. In some viewing locations, however, both left (L) and right (R) eye views are seen by each eye, and in other viewing locations, left (L) and right (R) eye views are viewed in a reverse perspective, which is eliminated by adding black zones in the image plane 4.

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XEROX DISCLOSURE JOURNAL

STEREO IMAGING USING A DUPLEX LASER PRINTER John R. Andrews

Proposed Classification US. C1.352/081
Int. C1. G03b 41/00

FIG. I

10 J

XEROX DISCLOSURE JOURNAL - Vo1.17 No. 5 September/October 1992 321

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STEREO IMAGING USING A DUPLEX LASER PRINTER (Cont'd)

A method for generating stereo output using a laser printer and a transparent receiving sheet is disclosed. The printer must have duplex imaging capability for the method to be compatible with black or color printers. Figure 1 shows a stop array technique, which is an amenable configuration for use with laser printers. The technique uses stop array 2 to restrict viewing of image plane 4 so that only left eye views (L) are seen from some locations and right eye views
(R) are seen from other location. The stop array technique uses a transparency 5 with stop array 2 on front surface 6 and complex image 4 on back surface 8. Complex image 4 consists of alternating parts of an image for left eye view (L) and other parts for right eye view (R). Eyes 10 and 12 view in stereo since each eye views only what is in its respective line of sight 14 or 16. In some viewing locations, however, both left (L) and right (R) eye views are seen by each eye, and in other viewing locations, left (L) and right (R) eye views are viewed in a reverse perspective, which is eliminated by adding black zones in the image plane 4.

Stereo image construction on a laser printer is represented by the parameters shown in Figure 2. The necessary parameters for calculating the thickness of transparency 5 are intraocular separation w, viewing distance d, transparency thickness v and separation between left and right eye image strips s. For example, using w = 7 cm and d = 60 cm, and minimum image strip width s for a 300 spi (spot per inch) laser printer, one pixel width or s=8.5x10-3 cm, transparency thickness is expressed as v = s (d/w) = 0.727 mm (0.029"). A value of v = 0.727 mm is seven times thicker than a standard transparency, but much thinner than some card stock paper. For stereo image viewing, transparency 5 consists of one pixel wide vertical information sets. Back side 8 consists of alternating one pixel wide vertical columns containing appropriate image information for the left and right eye. Front side 6 consists of one pixel wide lines separated by one pixel wide blank spaces.

In order to have a prime viewing zone centered on transparen...