[54] IMAGE DATA CODING AND DECODING
SYSTEM FOR EFFICIENTLY
COMPRESSING INFORMATION USING THE
SHAPE AND POSITION OF THE IMAGE
CONTENT
[75] Inventors: Noboru Yamaguchi, Yashio; Toshiaki Watanabe, Yokohama; Kenshi Dachiku, Kawasaki; Yoshihiro Kikuchi, Yokohama; Takashi Ida, Kawasaki; Takeshi Chujoh, Tokyo-To, all ol Japan
[73] Assignee: Kabushiki Kaisha Toshiba, Kawasaki, Japan
[21] Appl. No.: 08/942,200 [22] Filed: Oct. 1, 1997
Related U.S. Application Data
[63] Continuation of application No. 08/554,916, Nov. 9, 1995, abandoned.
[30] Foreign Application Priority Data
Nov. 10, 1994 [JP] Japan 6-276599
Apr. 21, 1995 [JP] Japan 7-097073
[51] Int. CI.6 G06K 9/36; G06K 9/46
[52] U.S. CI 382/243; 382/239; 382/242;
382/250; 382/253; 348/398; 348/404; 348/418
[58] Field of Search 382/232, 233,
382/243, 250, 166, 237, 239, 248, 251, 253; 358/433, 539; 348/398, 410, 420, 432, 403, 404, 408, 437, 438, 414, 417,
418
[56] References Cited
U.S. PATENT DOCUMENTS
4,698,689 10/1987 Tzou 358/433
5,144,688 9/1992 Bovir et al 382/166
5,150,432 9/1992 Ueno et al 382/250
5,225,904 7/1993 Golin et al 348/410
5,267,333 11/1993 Aono et al 382/166
5,309,232 5/1994 Hartung et al 348/398
5,321,750 6/1994 Nadan 380/20
5,361,147 11/1994 Katayama et al 358/539
5,408,270 4/1995 Lim 348/432
5,422,963 6/1995 Chen et al 382/232
5,553,160 9/1996 Dawson 382/239
5,592,302 1/1997 Hirabayashi 358/433
5,608,458 3/1997 Chen et al 348/420
FOREIGN PATENT DOCUMENTS
5-95541 4/1993 Japan .
OTHER PUBLICATIONS
Peter L. Silsbee, et al., "Visual Pattern Image Sequencing Coding," IEEE Transactions on Circuits and Systems for Video Technology, vol. 3, No. 4, Aug. 1993, pp. 291-301.
Primary Examiner—Amelia Au
Assistant Examiner—-Timothy M. Johnson
Attorney, Agent, or Firm—Finnegan, Henderson, Farabow,
Garrett & Dunner, L.L.P.
[57] ABSTRACT
An image data coding system comprises a screen-area determining means for determining the area ol a screen reproduced on the basis ol an input image data; a codeamount assigning control means for controlling regions to which data on the screen are to be assigned and the code amount assigned to each ol the regions, on the basis ol the results determined on the area ol the reproduced screen; and a coding means lor coding the image data signal inputted in accordance with the code amount assigned to each ol the regions. In an image data coding and/or decoding system, a coding system performs the two-dimensional orthogonal transform ol picture signals ol all the pixels with respect to inside blocks and ol only picture signals ol pixels contained in a content with respect to edge blocks, in accordance with a map signal indicative ol the position and shape ol the content, and it codes the map signal. A decoding system selects an orthogonal transform coefficient necessary to reproduce an image ol a desired resolution from coded orthogonal coefficients on the basis ol a coded and resolution-transformed map signal. It performs the twodimensional inverse orthogonal transform ol all the coefficients with respect to the inside blocks and ol only the coefficients contained in the content with respect to the edge blocks thereby deriving a resolution-transformed regenerative signal.
10 Claims, 31 Drawing Sheets
