MITSUBISHI SEMICONDUCTOR (LSI)
M65762FP
QM-CODER
DESCRIPTION
The M65762FP is a compression and decompression LSI
conforming to the high efficiency encoding system (QM-Coder) in
the International Standard, the JBIG/JPEG (ITU-T Recommenda-
tions T.81 and T.82) for coding still images. It also conforms to the
International Standard (ITU-T Recommendation T.85) for facsimile.
The QM-Coder is an information dependent type which is capable
of completely restoring original image data, and is equipped with
the learning function to always optimize parameters according to
the statistical characteristics of images. The QM-Coder is therefore
superior in compression ratio compared with the existing binary
coding system (MH/MR/MMR) and can greatly improve the half
toning image (dithered half toning image) whose compression ratio
is especially poor.
•
Number of processing lines
• Is capable of issuing the start of processing (temporary stop
command) several times to encode/decode any lines more
than or equal to 65535 lines.
•
Supporting 3-bus interface
• An 8-bit host bus corresponds to the MPU is available to load
and store of context table RAM.
• For input/output of binary image data, is capable of performing
32-bit or 16-bit parallel or serial input/output.
• For input/output of coding data, is capable of selecting 32-
bit/16-bit/8-bit bus to perform DMA transfer of coding data.
•
Is capable of making scale-down for coding and scale-up for
decoding.
•
Is capable of setting marker code for coding and detecting
marker code for decoding.
•
Built-in RAM for 4096 bytes for line memory, built-in context table
RAM and built-in probability estimation table ROM of 113 status
•
+5V single power supply
FEATURES
for facsimile.
•
Completely conforms to the International Standard (ITU-T T.85)
•
Achieves encoding/decoding with the arithmetic coder (QM-
Coder) conforming to the recommendation of the International
Standard JBIG/JPEG.
•
Is expected to conform to the International Standard for color
facsimile (T.Pallete-colour).
•
High speed processing that puts into effect coding and decoding
at 40 million pixels per sec maximum.
•
Is possible data-through processing without coding and decodin.
•
Can select context
• Provides 10 pixel template model for minimum resolution
conforming to JBIG and can select 2-line or 3-line template
model.
•
Built-in typical prediction function
• Capable of coding and decoding by using the typical prediction.
• Since use of the typical prediction does not require the
processing of the line (TP line) which is matched the previous
line's data, is capable of reducing data and processing time.
•
Built-in adaptive template (AT) function
• Is capable of setting AT pixels before 127 pixels on the coding
line.
• Since It is possible to change the position of AT pixel in a
specified line, is
capable of
improving compression
characteristics even when image characteristic is changed in
the middle of the screen.
•
Supporting multi-stripe
• When a page consists of more than one stripe, is capable of
repeating encoding/decoding process in stripes.
•
Built-in load/store function of line memory
planes and multi-stripe function
•
Is capable of loading image data for reference line from
outside to line memory of the LSI and storing image data from
line memory to outside.
Supporting multiple
APPLICATION
•
OA equipment including facsimile, copier and printer
•
Digital and amusement equipment for the purpose of reducing
memory
MITSUBISHI [ MITSUBISHI ELECTRIC SEMICONDUCTOR ]
