Browse Prior Art Database

Suppressing Redundant Information in a Television Signal

IP.com Disclosure Number: IPCOM000092590D
Original Publication Date: 1966-Dec-01
Included in the Prior Art Database: 2005-Mar-05
Document File: 2 page(s) / 42K

Publishing Venue

IBM

Related People

Masters, CT: AUTHOR

Abstract

This system suppresses that part of a television signal which is constant from one frame to the next by transforming temporal redundancy to spatial redundancy. Image splitter 10, comprising half-silvered mirror 14 and mirror 15, provides two identical images of object 12. The images are focused for side-by-side positioning on face 16 of vidicon 18. Shutter 20 passes the two images alternately. Vidicon 18 thus stores two images, comprising the same image observed at different times, in the form of a charge pattern.

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Suppressing Redundant Information in a Television Signal

This system suppresses that part of a television signal which is constant from one frame to the next by transforming temporal redundancy to spatial redundancy. Image splitter 10, comprising half-silvered mirror 14 and mirror 15, provides two identical images of object 12. The images are focused for side-by-side positioning on face 16 of vidicon 18. Shutter 20 passes the two images alternately.

Vidicon 18 thus stores two images, comprising the same image observed at different times, in the form of a charge pattern.

The two images are read out simultaneously by camera 21 by arranging for its horizontal scan length to include corresponding scan lines of each. Sweep circuit 30 provides horizontal and vertical sweep voltages for camera 21 on lines 32 and 34, respectively, and sweep position information on line 36. The video output of camera 21 is input to delay line 22. The latter delays the video signal by one-half the horizontal scan period. The delayed and undelayed signals are inputs to difference detector 24, the output of which is present only when corresponding elements of the two images are different, i. e., not redundant. This signal causes either the delayed or undelayed video line to be sampled by sample and hold circuit 26 after selection by switch 28 which operates during the vertical retrace interval.

The video line 23 or 25 to be sampled depends on which image is the most recent. The output of cir...