Horizontal compression of pixels in a reduced-size video image utilizing cooperating subsampling and display rates
US4656515A · kind A · utility
25Cited by
8References
9Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Mar 25, 1985 |
| Grant date | Apr 7, 1987 |
| Priority date | — |
| Expiry date | Mar 25, 2005 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N5/45
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A pix-in-pix television display includes circuitry for reducing the amount of memory needed to hold one field of the reduced size image. In the display apparatus, digital samples representing the large and small picture signals are developed at substantially equal rates by separate circuitry. Subsampling circuitry stores one out of every five of the samples representing a horizontal line of the small picture. These samples are displayed, synchronous with the large picture at a rate three-fifths times the display rate of the large picture samples to produce an apparent size reduction of one-third in the horizontal direction.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.