Encoding and decoding device and method using intra prediction

A decoding apparatus using intra prediction, the decoding apparatus comprising:

• a reference pixel characteristics extractor for receiving one or more reference pixel included in neighboring blocks of a target block to be decoded to determine a reference pixel characteristic and determining whether an adaptive filtering is applied to the one or more reference pixel, based on the reference pixel characteristic;
• a first intra predictor responsive to when the reference pixel characteristics extractor determines that the adaptive filtering is applied for extracting filtering information from encoded data received from an encoding apparatus and using extracted filtering information as a basis for outputting either one of the results of performing an intra prediction using a high-frequency filtered reference pixel and an intra prediction using a high-frequency-unfiltered reference pixel;
• and
• a second intra predictor responsive to when the reference pixel characteristics extractor determines that the adaptive filtering is not applied for determining that the filtering information is not present in the encoded data and outputting the result of performing the intra prediction using the high-frequency-unfiltered reference pixel.

An encoding method using intra prediction, the encoding method comprising:

• a reference pixel characteristics extraction process for receiving one or more reference pixel included in neighboring blocks of a target block to be encoded to determine a reference pixel characteristic and determining whether an adaptive filtering is applied to the one or more reference pixel, based on the reference pixel characteristic;
• a first intra prediction process responsive to when the adaptive filtering is determined in the reference pixel characteristics extraction process to be applied for comparing between results of performing an intra prediction using a high-frequency filtered reference pixel and an intra prediction using a high-frequency-unfiltered reference pixel to output cost-efficient one of the results involving costs along with filtering information indicating whether to perform filtering or not;
• and
• a second intra prediction process for outputting the result of performing the intra prediction using the high-frequency-unfiltered reference pixel when the reference pixel characteristics extracting process determines that the adaptive filtering is not to be applied.

A decoding method using intra prediction, the decoding method comprising:

• a reference pixel characteristics extraction process for receiving one or more reference pixel included in neighboring blocks of a target block to be decoded to determine a reference pixel characteristic and determining whether an adaptive filtering is applied to the one or more reference pixel, based on the reference pixel characteristic;
• a first intra prediction process responsive to when the reference pixel characteristics extracting process determines that the adaptive filtering is applied for extracting filtering information from encoded data received from an encoding apparatus and using extracted filtering information as a basis for outputting either one of the results of performing an intra prediction using a high-frequency filtered reference pixel and an intra prediction using a high-frequency-unfiltered reference pixel;
• and
• a second intra prediction process responsive to when the reference pixel characteristics extractor determines that the adaptive filtering is not applied for determining that the filtering information is not present in the encoded data and outputting the result of performing the intra prediction using the high-frequency-unfiltered reference pixel.