| Mapping table for offset/length coding (Test 4)
It is found that the matching string length has unusual characteristic that many special and large values are more frequently used than many small values. Based on the characteristics, a mapping of the string length values to two matching parameters (pos and len) is introduced to improve the coding efficiency for length values.
Input documents: JCTVC-S0192.
Frequent colour table (Test 5)
A frequent colour table is introduced to code escape pixels. There are 128 entries in the table, each contains three sample values. The table can be updated once an escape pixel is explicitly coded.
Input documents: JCTVC-S0161.
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