Abstract: An input control unit collectively sends a plurality of pieces of variable length code data. A primary analysis processing unit processes a first piece of variable length code data, recognizes zero run information, group number information, and overhead bit information relating thereto, and outputs them to a frequency conversion unit. A continuous analysis processing unit processes one or more pieces of variable length code data subsequent to the first piece of variable length code data. In the case of variable length code data targeted for a predetermined process, the continuous analysis processing unit recognizes zero run information, group number information, and overhead bit information relating thereto, and output them to the frequency conversion unit. In the case of not the variable length code data targeted for the predetermined process, the continuous analysis processing unit discards this and subsequent pieces of data.

Abstract: A Huffman decoding unit includes: a code analysis unit configured to analyze compressed image data in encoded data sequentially received, and sequentially recognize zero run information, group number information, and additional bit information; and a frequency conversion unit configured to generate coefficient information based on the recognized zero run information, group number information and additional bit information. The code analysis unit receives the encoded data sequentially received and cutout information for cutting out a partial image from an entire image that is decodable based on the compressed image data. When the cutout information is received, only in a case where the compressed image data sequentially received is compressed image data intended for cutout, the code analysis unit outputs, to the frequency conversion unit, the zero run information, the group number information, and the additional bit information, each of which is recognized by analyzing the compressed image data.

Abstract: An input control unit collectively sends a plurality of pieces of variable length code data. A primary analysis processing unit processes a first piece of variable length code data, recognizes zero run information, group number information, and overhead bit information relating thereto, and outputs them to a frequency conversion unit. A continuous analysis processing unit processes one or more pieces of variable length code data subsequent to the first piece of variable length code data. In the case of variable length code data targeted for a predetermined process, the continuous analysis processing unit recognizes zero run information, group number information, and overhead bit information relating thereto, and output them to the frequency conversion unit. In the case of not the variable length code data targeted for the predetermined process, the continuous analysis processing unit discards this and subsequent pieces of data.

Abstract: A Huffman decoding unit includes: a code analysis unit configured to analyze compressed image data in encoded data sequentially received, and sequentially recognize zero run information, group number information, and additional bit information; and a frequency conversion unit configured to generate coefficient information based on the recognized zero run information, group number information and additional bit information. The code analysis unit receives the encoded data sequentially received and cutout information for cutting out a partial image from an entire image that is decodable based on the compressed image data. When the cutout information is received, only in a case where the compressed image data sequentially received is compressed image data intended for cutout, the code analysis unit outputs, to the frequency conversion unit, the zero run information, the group number information, and the additional bit information, each of which is recognized by analyzing the compressed image data.