Huffman encoder, Huffman encoding method and recording medium having program for Huffman encoding process recorded thereon

A Huffman encoder for encoding a series of data into Huffman codes, comprising:

• a determination circuit for determining whether each item of a series of data is within a predetermined range;
• and
• an encoding circuit for performing encoding using combinations of the number of consecutive invalid coefficients and valid coefficients, the invalid coefficients being data among said series of data which are within said predetermined range, the valid coefficients being data out of said predetermined range.

A method for Huffman encoding for encoding a series of data into Huffman codes, comprising the steps of:

• determining whether each item of a series of data is within a predetermined range;
• and
• performing Huffman encoding using combinations of the number of consecutive invalid coefficients and valid coefficients, the invalid coefficients being data among said series of data within said predetermined range, the valid coefficients being data out of said predetermined range.

A recording medium having a processor-readable program for a Huffman encoding process recorded thereon, wherein said program for a Huffman encoding process causes said processor to perform a process of determining whether each item of a series of data is within a predetermined range and a process of performing encoding utilizing combinations of the number of consecutive invalid coefficients and valid coefficients, the invalid coefficients being data among said series of data within said predetermined range, the valid coefficients being data out of said predetermined range.

A processor-readable program for a Huffman encoding process comprising the steps of:

• causing said processor to perform a process of determining whether each item of a series of data is within a predetermined range;
• and
• causing said processor to perform a process of performing encoding utilizing combinations of the number of consecutive invalid coefficients and valid coefficients, the invalid coefficients being data among said series of data within said predetermined range, the valid coefficients being data out of said predetermined range.