Encoding Apparatus, Encoding Method, and Program of Same and Decoding Apparatus, Decoding Method, and Program of Same

An encoding apparatus for encoding progressive image data and interlace image data corresponding to the progressive image data, the encoding apparatus comprising:

• a first encoding means for encoding picture data composing the interlace image data to generate first encoded data and decoding and recomposing the first encoded data to generate recomposed image data,
• an up sample processing means for up sampling the recomposed image data generated by the first encoding means to generate image data having the same resolution as that of the progressive image data, and
• a second encoding means for encoding picture data composing the progressive image data using the image data generated by the up sample processing means as predictive image data to generate second encoded data.

An encoding method for encoding progressive image data and interlace image data corresponding to the progressive image data, the encoding method including:

• a first step of encoding picture data composing the interlace image data to generate first encoded data and decoding and recomposing the first encoded data to generate recomposed image data,
• a second step of up sampling the recomposed image data generated at the first step to generate image data having the same resolution as that of the progressive image data, and
• a third step of encoding the picture data composing the progressive image data using the image data generated at the second step as predictive image data to generate second encoded data.

A decoding apparatus for decoding first encoded data obtained by encoding progressive image data and second encoded data obtained by encoding interlace image data corresponding to the progressive image data, the decoding apparatus comprising:

• a first decoding unit configured to decode the second encoded data,
• an up sample processing unit configured to interpolate first predictive image data generated by the decoding in the first decoding unit to generate second predictive image data, and
• a second decoding unit configured to decode the first encoded data based on the second predictive image data generated at the up sample processing unit.

A decoding apparatus for decoding first encoded data obtained by encoding progressive image data and second encoded data obtained by encoding interlace image data corresponding to the progressive image data, the decoding apparatus comprising:

• a first decoding means for decoding the second encoded data,
• an up sample processing means for interpolating first predictive image data generated by the decoding in the first decoding means to generate second predictive image data, and
• a second decoding means for decoding the first encoded data based on the second predictive image data generated at the up sample processing means.

A decoding method for decoding first encoded data obtained by encoding progressive image data and second encoded data obtained by encoding interlace image data corresponding to the progressive image data, the decoding method including:

• a first step of decoding the second encoded data,
• a second step of interpolating the first predictive image data generated by the decoding at the first step to generate second predictive image data, and
• a third step of decoding the first encoded data based on the second predictive image data generated at the second step.

A program executed by a computer for encoding progressive image data and interlace image data corresponding to the progressive image data, which program makes the computer execute the following steps:

• a first routine of encoding the picture data composing the interlace image data to generate first encoded data and decoding and recomposing the first encoded data to generate recomposed image data,
• a second routine of up sampling the recomposed image data generated at the first routine to generate image data having the same resolution as that of the progressive image data, and
• a third routine of encoding the picture data composing the progressive image data using the image data generated in the second routine as predictive image data to generate second encoded data.

A program executed by a computer for decoding first encoded data obtained by encoding progressive image data and second encoded data obtained by encoding interlace image data corresponding to the progressive image data, which program makes the computer execute the following steps:

• a first routine of decoding the second encoded data,
• a second routine of interpolating the first predictive image data generated by the decoding at the first routine to generate second predictive image data, and
• a third routine of decoding the first encoded data based on the second predictive image data generated at the second routine.