Signal converting apparatus and signal converting method

A signal converting apparatus for converting an input first video signal into a second video signal, comprising:

• a unit for evaluating a spatial activity for said first video signal to generate an activity code;
• a unit for classifying said first video signal by quantizing said first video signal to generate a class code, said unit for classifying adaptively changing a level resolution capability when quantizing said first video signal in accordance with said activity code;
• a memory storing prediction coefficients for each class for productively producing said second video signal;
• a unit for producing said second video signal by predictively calculating said first inputted video signal using the prediction coefficient read out from said memory corresponding to at least the class code.

A signal converting apparatus for converting an inputted first video signal into a second video signal, comprising:

• a unit for evaluating a spatial activity for said first video signal to generate an activity code;
• a unit for setting a plurality of different patterns for said first video signal to select a pixel pattern from a set of pixel patterns in accordance with said activity code, and classifying said first video signal using the selected pixel pattern in order to generate a class code;
• a memory storing a prediction value for each class for predictively producing said second video signal;
• and
• a unit for producing said second video signal in accordance with the prediction value read out from said memory corresponding to at least the class code.

A video signal converting method for converting an inputted first video signal into a second video signal different from said first video signal, comprising the steps of:

• evaluating an intra-space activity for said first video signal to generate an activity code;
• performing stepwise classification based on said activity code to generate a class code based on the result of the classification;
• reading out a prediction coefficient stored in a prediction coefficient memory for predictively producing said second video signal, using said first video signal in accordance with said activity code and/or said class code;
• performing a prediction calculation for said first inputted video signal using the read out prediction coefficient;
• and
• outputting a prediction calculation value as said second video signal, wherein said class code is generated by setting a plurality of different pixel patterns for said first video signal to select a pixel pattern from the plurality of pixel patterns in accordance with said activity code and classifying said first video signal using the selected pixel pattern.

A video signal converting method for converting an inputted first video signal into a second video signal different from the first video signal, comprising the steps of:

• evaluating an intra-space activity for said first video signal to generate an activity code;
• performing stepwise classification based on said activity code to generate a class code based on the result of the classification;
• reading out a prediction coefficient stored in a prediction coefficient memory for predictively producing said second video signal, using said first video signal in accordance with said activity code and/or said class code;
• performing a prediction calculation for said first inputted video signal using the read out prediction coefficient;
• and
• outputting a prediction calculation value as said second video signal wherein said class code is generated by classifying said first video signal by quantizing said first video signal based on a dynamic range defined by each pixel in a neighboring region of a re-marked pixel in said first video signal, and wherein said class code is further generated by changing a resolution level when quantizing said first video signal in accordance with said activity code.

A signal converting method for converting an inputted first video signal into a second video signal different from the first video signal, comprising the steps of:

• evaluating an intra-space activity for said first video signal and outputting an activity code;
• performing stepwise classification based on said activity code and outputting a class code based on a result of the classification;
• reading a prediction value stored in a prediction value memory in accordance with said activity code and/or said class code;
• and
• outputting said prediction value produced as an interpolated pixel signal for said first video signal wherein said activity code is produced by setting a plurality of different pixel patterns for said first video signal, selecting a pixel pattern from the plurality of pixel patterns in accordance with said activity code, and classifying said first video signal using the selected pixel pattern.

A signal converting apparatus for converting an input first video signal into a second video signal, comprising:

• a unit for evaluating a spatial and temporal activity for said first video signal to generate an activity code;
• a unit for selecting a plurality of pixels in accordance with said activity, and classifying said first video signal using the plurality of pixels in order to generate a class code;
• a memory stored with prediction coefficients for each class for predictively producing said second video signal;
• and
• a unit for producing said second video signal by calculating said first video signal using the prediction coefficient read out from said memory corresponding to at least the class code.

A method for converting an input first video signal into a second video signal, comprising the steps of:

• evaluating a spatial and temporal activity for said first video signal to generate an activity code;
• selecting a plurality of pixels in accordance with said activity, and classifying said first video signal using the plurality of pixels in order to generate a class code;
• and
• producing said second video signal with prediction coefficients stored for each class in a memory for predictively calculating said first video signal using the prediction coefficient read out from said memory corresponding to at least the class code for producing said second video signal.