METHOD AND SYSTEM OF ELECTRONIC IMAGE STORAGE AND DISPLAY
 Inventor: Steven R. Hofstein, North Brunswick, N.J.
 Assignee: Princeton Electronic Products, Inc., North Brunswick, NJ.
[ * ] Notice: The portion of the term of this patent subsequent to Mar. 1, 1994, has been disclaimed.
 Appl. No.: 742,329
 Filed: Nov. 16,1976
Related U.S. Application Data
 Continuation-in-part of Ser. No. 601,615, Aug. 4, 1975, Pat. No. 4,010,466.
 Int. C1.2 G01S 9/02; G01S 7/04;
GO IS 9/66; H04N 5/30
 U.S. CI 343/5 SC; 340/1 R;
340/3 R; 343/17; 358/112; 358/140
 Field of Search 343/5 SC, 17; 340/1 R,
340/3 R; 358/112, 140
 References Cited
U.S. PATENT DOCUMENTS
3,146,441 8/1964 Miller 343/5 SC
3,392,385 7/1968 Martin 343/5 SC
3,550,123 12/1970 Brown et al 343/5 SC
3,792,194 2/1974 Wood et al 358/112
3,830,971 8/1974 Polder 358/140
3,864,660 2/1975 Ranalli et al 340/1 R
3,904,817 9/1975 Hoffman et al 358/140
Primary Examiner—S. C. Buczinski
Attorney, Agent, or Firm—Samuelson & Jacob
A method and system of electronic image storage and display wherein the display is viewed on a raster scan TV display and the incoming signal comprises a sequence of scan lines whose line rate is lower than that of the horizontal TV line rate and is an integer submultiple, preferably even, thereof. The incoming signal is stored in the memory of a scan converter and the stored image is scanned and displayed on a conventional television raster scan display.
The scan converter mode is alternated between read and write such that the writing is carried out during the time required to scan one horizontal TV line in the field and the reading is carried out during the time required to scan the next horizontal TV line in the field to thereby write and read during alternate horizontal TV lines.
To produce a spatially uniform raster, the horizontal TV lines of succeeding TV fields are offset by one line from the horizontal TV lines of the preceding field.
44 Claims, 18 Drawing Figures