Video coding apparatus and method which codes information indicating whether an intraframe or interframe predictive coding mode is used

A computer system for video coding, comprising:

• a prediction signal generating device configured to select one of an intraframe predictive coding method and an interframe predictive coding method for coding an input video signal divided into a plurality of regions, and to selectively generate an intraframe prediction signal with the intraframe predictive coding method and a set of an interframe prediction signal and a motion vector with the interframe predictive coding method;
• a first coding device configured to code coding mode information for each of the regions to indicate one of the intraframe and interframe predictive coding methods and to obtain plural coded coding mode information, and to code the motion vector obtained for each of the regions by said prediction signal generating device in the interframe predictive coding method to obtain plural coded motion vectors;
• a prediction error generating device configured to generate a prediction error signal for each of the regions based on one of the intraframe prediction signal and the interframe predictive signal generated by the prediction signal generating device and the input video signal;
• a second coding device configured to code the prediction error signal for each of the regions to obtain plural coded prediction error information;
• and
• a code string generating device configured to output a code string including a synchronization code, a group of the plural coded coding mode information, a group of the coded motion vectors and a group of the plural coded prediction error information, which are all arranged in this order corresponding to a descending order of importance in decoding.

A method of encoding video using a computer system, comprising the steps of:

• selecting one of an intraframe predictive coding method and an interframe predictive coding method for coding an input video signal divided into a plurality of regions, and selectively generating an intraframe prediction signal with the intraframe predictive coding method and a set of an interframe prediction signal and a motion vector with the interframe predictive coding method;
• coding coding mode information for each of the regions to indicate one of the intraframe and interframe predictive coding methods and to obtain plural coded coding mode information, and coding the motion vector obtained for each of the regions in the interframe predictive coding method to obtain plural coded motion vectors;
• generating a prediction error signal for each of the regions based on one of the intraframe prediction signal and the interframe predictive signal, and the input video signal;
• coding the prediction error signal for each of the regions to obtain plural coded prediction error information;
• and
• outputting a code string including a synchronization code, a group of the plural coded coding mode information, a group of the coded motion vectors and a group of the plural coded prediction error information, which are all arranged in this order corresponding to a descending order of importance in decoding.

A computer system for video coding, comprising:

• prediction signal generating means for selecting one of an intraframe predictive coding method and an interframe predictive coding method for coding an input video signal divided into a plurality of regions, to selectively generate an intraframe prediction signal with the intraframe predictive coding method and a set of an interframe prediction signal and a motion vector with the interframe predictive coding method;
• first coding means for coding coding mode information for each of the regions to indicate one of the intraframe and interframe predictive coding methods and for obtaining plural coded coding mode information;
• second coding means for coding the motion vector obtained for each of the regions by said prediction signal generating means in the interframe predictive coding method to obtain plural coded motion vectors;
• prediction error generating means for generating a prediction error signal for each of the regions based on one of the intraframe prediction signal and the interframe predictive signal generated by the prediction signal generating means and the input video signal;
• third coding means for coding the prediction error signal for each of the regions to obtain plural coded prediction error signals;
• code string generating means, which operates during the intraframe predictive coding method, for outputting a code string including a synchronization code, a group of the plural coded coding mode information, and a group of the coded prediction error signals, which are all arranged in this order corresponding to a descending order of importance in decoding;
• and
• code string generating means which operates during the interframe predictive coding method, for outputting a code string including a synchronization code, a group of the plural coded coding mode information, a group of the coded motion vectors and a group of the coded prediction error signals, which are all arranged in this order corresponding to a descending order of importance in decoding.

A computer system for video coding, comprising:

• a prediction signal generating device configured to select one of an intraframe predictive coding method and an interframe predictive coding method for coding an input video signal divided into a plurality of regions, to selectively generate an intraframe prediction signal with the intraframe predictive coding method and a set of an interframe prediction signal and a motion vector with the interframe predictive coding method;
• a first coding device configured to code coding mode information for each of the regions to indicate one of the intraframe and interframe predictive coding methods and to obtain plural coded coding mode information;
• a second coding device configured to code the motion vector obtained for each of the regions by said prediction signal generating device in the interframe predictive coding method to obtain plural coded motion vectors;
• a prediction error generating device configured to generate a prediction error signal for each of the regions based on one of the intraframe prediction signal and the interframe predictive signal generated by the prediction signal generating device and the input video signal;
• a third coding device configured to code the prediction error signal for each of the regions to obtain plural coded prediction error signals;
• and
• a code string generating device which outputs a code string including a synchronization code, a group of the plural coded coding mode information, and a group of the coded prediction error signals, which are all arranged in this order corresponding to a descending order of importance in decoding.

A method of coding video using a computer system, comprising the steps of:

• selecting one of an intraframe predictive coding method and an interframe predictive coding method for coding an input video signal divided into a plurality of regions, and selectively generating an intraframe prediction signal with the intraframe predictive coding method and a set of an interframe prediction signal and a motion vector with the interframe predictive coding method;
• coding coding mode information for each of the regions to indicate one of the intraframe and interframe predictive coding methods and to obtain plural coded coding mode information;
• coding the motion vector obtained for each of the regions in the interframe predictive coding method to obtain plural coded motion vectors;
• generating a prediction error signal for each of the regions based on one of the intraframe prediction signal, and the interframe predictive signal and the input video signal;
• coding the prediction error signal for each of the regions to obtain plural coded prediction error signals;
• outputting, during the intraframe predictive coding method, a code string including a synchronization code, a group of the plural coded coding mode information, and a group of the coded prediction error signals, which are all arranged in this order corresponding to a descending order of importance in decoding;
• and
• outputting, during the interframe predictive coding method, a code string including a synchronization code, a group of the plural coded coding mode information, a group of the coded motion vectors and a group of the coded prediction error signals, which are all arranged in this order corresponding to a descending order of importance in decoding.

A computer system for video coding, comprising:

• prediction signal generating means for selecting one of an intraframe predictive coding method and an interframe predictive coding method for coding an input video signal divided into a plurality of regions, and for selectively generating an intraframe prediction signal with the intraframe predictive coding method and a set of an interframe prediction signal and a motion vector with the interframe predictive coding method;
• first coding means for coding coding mode information for each of the regions to indicate one of the intraframe and interframe predictive coding method and to obtain plural coded coding mode information;
• second coding means for coding the motion vector obtained for each of the regions by said prediction signal generating means in the interframe predictive coding method to obtain plural coded motion vectors;
• prediction error generating means for generating a prediction error signal for each of the regions based on one of the intraframe prediction signal and the interframe predictive signal generated by the prediction signal generating means and the input video signal;
• third coding means for coding the prediction error signal for each of the regions to obtain plural coded prediction error signals;
• and
• code string generating means for outputting a code string including a synchronization code, a group of the plural coded coding mode information, a group of the plural coded motion vectors, and a group of the plural coded prediction error signals, which are all arranged in this order corresponding to a descending order of importance in decoding.

A computer system for video coding, comprising:

• a prediction signal generating device configured to select one of an intraframe predictive coding method and an interframe predictive coding method for coding an input video signal divided into a plurality of regions, and to selectively generate an intraframe prediction signal with the intraframe predictive coding method and a set of an interframe prediction signal and a motion vector with the interframe predictive coding method;
• a first coding device configured to code coding mode information for each of the regions to indicate one of the intraframe and interframe predictive coding method and to obtain plural coded coding mode information;
• a second coding device configured to code the motion vector obtained for each of the regions by said prediction signal generating device in the interframe predictive coding method to obtain plural coded motion vectors;
• a prediction error generating device configured to generate a prediction error signal for each of the regions based on one of the intraframe prediction signal and the interframe predictive signal generated by the prediction signal generating device and the input video signal;
• a third coding device configured to code the prediction error signal for each of the regions to obtain plural coded prediction error signals;
• and
• a code string generating device configured to output a code string including a synchronization code, a group of the plural coded coding mode information, a group of the plural coded motion vectors, and a group of the plural coded prediction error signals, which are all arranged in this order corresponding to a descending order of importance in decoding.

A method of coding video using a computer system, comprising the steps of:

• selecting one of an intraframe predictive coding method and an interframe predictive coding method for coding an input video signal divided into a plurality of regions, and selectively generating an intraframe prediction signal with the intraframe predictive coding method and a set of an interframe prediction signal and a motion vector with the interframe predictive coding method;
• coding coding mode information for each of the regions to indicate one of the intraframe and interframe predictive coding method and to obtain plural coded coding mode information;
• coding the motion vector obtained for each of the regions in the interframe predictive coding method to obtain plural coded motion vectors;
• generating a prediction error signal for each of the regions based on one of the intraframe prediction signal and the interframe predictive signal and the input video signal;
• coding the prediction error signal for each of the regions to obtain plural coded prediction error signals;
• and
• outputting a code string including a synchronization code, a group of the plural coded coding mode information, a group of the plural coded motion vectors, and a group of the plural coded prediction error signals, which are all arranged in this order corresponding to a descending order of importance in decoding.

A computer system for video coding, comprising:

• prediction signal generating means for generating prediction signals for coding an input video signal divided into a plurality of regions;
• first coding means for coding coding mode information for each of the regions to obtain plural coded coding mode information which represent coding methods for each of the regions;
• prediction error generating means for generating a prediction error signal for each of the regions based on the prediction signal generated by the prediction signal generating means and the input video signal;
• DCT coefficient obtaining means for obtaining a DCT coefficient of the prediction error signal for each of the regions;
• second coding means for coding the DCT coefficients for each of the regions to obtain plural coded DCT coefficient;
• and
• code string generating means for outputting a code string including a synchronization code, a group of the plural coded coding mode information, a group of a DC component of the coded DCT coefficients of the prediction error signal, and a group of AC components of the coded DCT coefficients of the prediction error signal, which are all arranged in this order corresponding to a descending order of importance in decoding.

A computer system for video coding, comprising:

• a prediction signal generating device configured to generate prediction signals for coding an input video signal divided into a plurality of regions;
• a first coding device configured to code coding mode information for each of the regions to obtain plural coded coding mode information which represent coding methods for each of the regions;
• a prediction error generating device configured to generate a prediction error signal for each of the regions based on the prediction signal generated by the prediction signal generating device and the input video signal;
• a DCT coefficient obtaining device configured to obtain a DCT coefficient of the prediction error signal for each of the regions;
• a second coding device configured to code the DCT coefficients for each of the regions to obtain plural coded DCT coefficient;
• and
• a code string generating device configured to output a code string including a synchronization code, a group of the plural coded coding mode information, a group of a DC component of the coded DCT coefficients of the prediction error signal, and a group of AC components of the coded DCT coefficients of the prediction error signal, which are all arranged in this order corresponding to a descending order of importance in decoding.

The method of encoding using a computer system, comprising the steps of:

• generating prediction signals for coding an input video signal divided into a plurality of regions;
• coding coding mode information for each of the regions to obtain plural coded coding mode information which represent coding methods for each of the regions;
• generating a prediction error signal for each of the regions based on the prediction signals and the input video signal;
• obtaining a DCT coefficient of the prediction error signal for each of the regions;
• coding the DCT coefficients for each of the regions to obtain plural coded DCT coefficient;
• and
• outputting a code string including a synchronization code, a group of the plural coded coding mode information, a group of a DC component of the coded DCT coefficients of the prediction error signal, and a group of AC components of the coded DCT coefficients of the prediction error signal, which are all arranged in this order corresponding to a descending order of importance in decoding.