Sumitomo Metal Industries, Inc.

Tsutomu Endo

Nobuo Hayashi

Masahiro Kohno

An encoding apparatus includes an interval register (250), a calculator (208, etc.), means for providing a potential shift-amount (Shift.sub.-- LSZ) of the interval register for the image data in a specific condition (LPS), a shift-amount decision circuit (258), a shift-amount register (259), and a shifter (251). The interval register stores plural bits of interval data to be used for encoding the image data. The calculator updates the interval data in the interval register. The shift-amount decision circuit generates an actual shift-amount of the interval register, in accordance with the potential shift-amount and the output of the calculator. The shift-amount register stores the actual shift-amount, supplied from the shift-amount decision circuit. The shifter shifts the interval data in the interval register a plurality of bits at one time, in accordance with the actual shift-amount stored in the shift-amount register.

Apparatus for encoding image data

A conversion parameter for a (N)th image data is read from the information table (201) while converting a (N-1)th image data, which is inputted one clock prior to the (N)th image data. The (N)th image data is converted in accordance with the previously read conversion parameter when the conversion of the (N-1)th image data is completed.

Bi-level adaptive coding using a dual port memory and a context

In an image processing apparatus, an objective address signal is compared with at least one preceding address signal, provided prior to the objective address signal, to obtain a control signal. A unit of data corresponding to the objective address signal is read from a memory. A processor performs a predetermined processing to the unit of data to obtain renewal data. The renewal data are written to its original address in the memory. According to the control signal, a controller controls reading and writing access to the memory.

Growing community of inventors

Amagasaki, Japan

Tsutomu Endo