text: Patent US4866520 - Video system for displaying lower resolution video signals on higher ... - Google PatentsSearch Images Maps Play YouTube News Gmail Drive More »Sign inAdvanced Patent SearchPatentsLower resolution video signals (10) having alternating odd fields (12) and even fields (14) are stored in an odd line memory 20A and an even line 20B, respectively. An interpolator 22 interpolates adjacent odd and even lines. A selector 24 cyclically selects odd, even, and interpolated lines in a pre-selected...http://www.google.com/patents/US4866520?utm_source=gb-gplus-sharePatent US4866520 - Video system for displaying lower resolution video signals on higher resolution video monitorsAdvanced Patent SearchPublication numberUS4866520 APublication typeGrantApplication numberUS 07/161,782Publication dateSep 12, 1989Filing dateFeb 29, 1988Priority dateMar 4, 1987Fee statusPaidAlso published asDE3875983D1, DE3875983T2, EP0280932A1, EP0280932B1Publication number07161782, 161782, US 4866520 A, US 4866520A, US-A-4866520, US4866520 A, US4866520AInventorsKunihiro Nomura, Tetsuo Machida, Kazunari Yamada, Toshio TakekoshiOriginal AssigneeHitachi, Ltd.Export CitationBiBTeX, EndNote, RefManPatent Citations (10), Non-Patent Citations (7), Referenced by (50), Classifications (21), Legal Events (4) External Links: USPTO, USPTO Assignment, EspacenetVideo system for displaying lower resolution video signals on higher resolution video monitorsUS 4866520 AAbstract Lower resolution video signals (10) having alternating odd fields (12) and even fields (14) are stored in an odd line memory 20A and an even line 20B, respectively. An interpolator 22 interpolates adjacent odd and even lines. A selector 24 cyclically selects odd, even, and interpolated lines in a pre-selected pattern, such as one of the patterns illustrated in FIGS. 1, 7, 8A-F, and 9A-F. By selecting even, odd, and interpolated lines, the number of lines per picture is increased to produce a higher resolution video signal (30).
  Having thus described the preferred embodiments, the invention is now claimed to be: 1. An apparatus for enabling a lower resolution interlaced field video signal which has complete odd line fields that alternate cyclically with complete even line fields, in which complete odd line field and complete even line fields would be displayed alternately on a lower resolution video monitor to be displayed on a higher resolution video monitor, the apparatus comprising:a digitizing means for converting each received line of each even line field and of each odd line field to a pre-selected plurality of digital values; a write address means for determining a memory address corresponding to each digital value, the address being indicative of the field, a line number, and a position along the line; a memory means for storing the digital values in conjunction with the determined corresponding addresses, the memory means being operatively connected with the digitizing means and the write address means; a read address means for addressing the memory means to read digital values corresponding to selected lines of the odd and even line field; an odd line field memory means for receiving and holding a line of the odd line field digital values read from the memory means; an even line memory means for receiving and holding a line of the even line field digital values read from the memory means; an interpolating means for interpolating the digital values of an even line field from the even line memory means with the digital values of an odd line field from the odd line memory means to produce an interpolated line of digital values; a selecting means for cyclically selecting a mix of even field, odd field, and interpolated lines for display in a common higher resolution field on the higher resolution video monitor. 2. The apparatus as set forth in claim 1 further including a control means for controlling an order with which even and odd lines are read from the memory means into the even and odd line memory means.
  BACKGROUND OF THE INVENTION The present invention related to the video arts. It finds particular application in conjunction with adapting lower resolution interlaced television signals for display on higher resolution CRT displays of computer monitor and will be described with particular reference thereto. It is to be appreciated, however, that the invention will find other applications in the video signal processing field, such as adapting high resolution television monitors for use with low resolution broadcast signals, for zooming or magnifying video images, for converting video signals of one resolution to video signals of another resolution, and the like.
  SUMMARY OF THE INVENTION In accordance with one aspect of the present invention, an apparatus is provided for enabling a lower resolution video signal to be displayed in a higher resolution video monitor, i.e. a monitor that has more raster lines and dots than the lower resolution video signal. A digitizing means digitizes each line of the lower resolution video signal to create a preselected plurality of digital values. A write address means determines appropriate memory addresses for each digital value, which addresses are indicative of a line number within the picture or frame and of a position along the line. A memory means stores each digital value at the address determined by the write address determining means. A read address means at a rate controlled by the higher resolution video monitor addresses stored data in the memory means to retrieve selected complete even and odd numbered lines of digital values. An odd line memory means receives and temporarily holds each odd numbered raster line of digital values retrieved from the memory means and an even line memory means receives and holds each even numbered line. An interpolating means is connected with the even and odd line memory means for interpolating the lines held therein. That is, the interpolating means interpolates, eg. averages, a retrieved even line with a retrieved odd line. A selecting means cyclically selects among even, odd, and interpolated lines of data for display on the high resolution video monitor.
  DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT With reference to FIG. 1, a lower resolution video signal 10, such as an NTSC format signal includes alternating odd fields 12 and even fields 14. Each odd field includes odd raster or scan lines, i.e. the 1st, 3rd, 5th, etc. lines of the picture to be displayed. Each even field includes the even raster lines, i.e. the 2nd, 4th, 6th, etc. lines. The video signal includes the odd scan lines arranged serially followed by the even scan lines arranged serially, followed by the lines of successive odd and even fields. Synchronization information is inserted between each scan line and each field.
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OF JAPAN, JAPANFree format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNORS:NOMURA, KUNIHIRO;MACHIDA, TETSUO;YAMADA, KAZUNARI;AND OTHERS;REEL/FRAME:005063/0798Effective date: 19880114RotateOriginal ImageGoogle Home - Sitemap - USPTO Bulk Downloads - Privacy Policy - Terms of Service - About Google Patents - Send FeedbackData provided by IFI CLAIMS Patent Services©2012 Google