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The study table is constantly updated in this way, increasing the probabil-
ity of accurate predictions.
(4) The probability estimation table is published in the
contents are fixed, differing from those of the study table.
This table shows probability of accuracy/inaccuracy in the form of a range,
according to the accurate/inaccurate results of a given status prediction
value.
The plan of the probability estimation table is such that if the prediction is
accurate, the range of the next status number will be smaller than would be
the case in an inaccurate prediction.
The status number with this smaller range will be selected to be the next
status number.
(5) After the predicted value is found to be accurate/inaccurate by the
actual pixel, the model template, and the study table, that accuracy/
inaccuracy is encoded in the arithmetic encoding section, and the
encoded image data is output.
(6) In the encoding (mathematical encoding) done in the arithmetic
encoding section, there is no conversion table for encoding as is the
case in encoding with conventional MH and MR. Using the LSZ
(probability estimation value of an inaccurate prediction: the form of a
range) of the probability estimation table and the accuracy/inaccuracy
of the predicted value as a base, encoding is done by showing the posi-
tion of the progress of the prediction on an integer line (between 0 to
1.0). Encoding shown as a position on this integer line, take a position
under MPS in the case of accurate predictions, and under LPS in the
case of inaccurate predictions, as shown in the figure below.
Furthermore, there is a concept of range (A) in this arithmetic encod-
ing. This range (A)
predictions and as an LPS range in the case of inaccurate predictions
for each pixel. When these ranges (A) are below a certain range
leading edge bit (which excludes the encoding "0". shown by the posi-
tion on the integer line) shifts one position to the left as encoded image
data, and is output. At this time, the limit of this range (A) which was
below the certain range is narrow and it is difficult to show a position
more detailed than this, so the range (A) is magnified
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5–37
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