Title:
DATA FORMAT CONVERTING DEVICE
Document Type and Number:
Japanese Patent JP3465592
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To reduce the conversion processing time and to accelerate image processing by providing a conversion table, which stores 8-bit integer values corresponding to a bit pattern that uses higher order 16 bits of 32-bit floating point data as an index and a table lookup means, which performs table lookup of the conversion table with high order 16 bits.
SOLUTION: This data format converting device is provided with a conversion table, which stores 8-bit integer values corresponding to bit patterns that uses high order 16 bits of 32-bit floating point data as an index. The converting device is provided with a table lookup means, which performs table lookup of the conversion table through the high order 16 bits and coverts the data in a 32-bit integer format into an 8-bit integer format. The conversion table is produced by changing the higher order 16 bits into 0 to 162-1, registering 0 if it is 0 or less and 255 of it is 255 or more and registering 8-bit integer values, whose decimal point positions are rounded off when not ≤0 nor ≥255. Thus, frequent conversion processings in image processing, etc., can be accelerated.
Inventors:
Toshiya Nakajima
Application Number:
JP15271698A
Publication Date:
November 10, 2003
Filing Date:
June 02, 1998
Export Citation:
Assignee:
富士通株式会社
International Classes:
G06F7/00; G06F7/76; H03M7/24; (IPC1-7): H03M7/24; G06F7/00
Domestic Patent References:
| JP5840663A | ||||
| JP5030442A |
Attorney, Agent or Firm:
Junichi Yokoyama