Intra-picture prediction using non-adjacent reference lines of sample values

One or more computer-readable media storing computer-executable instructions for causing a computer system, when programmed thereby, to perform operations comprising:

• receiving encoded data as part of a bitstream, wherein a reference line index is signaled as part of the encoded data, the reference line index identifying a reference line of sample values used in intra-picture prediction for a current block of sample values in a picture;
• decoding the encoded data to reconstruct the picture, including performing intra-picture prediction for the current block of sample values in the picture, wherein a non-adjacent reference line of sample values is available for the intra-picture prediction, and wherein the decoding the encoded data to reconstruct the picture includes:
• determining a predictor for the reference line index, wherein the predictor is used to decode the reference line index;
• and
• outputting the reconstructed picture.

A computer system comprising:

• a coded data buffer configured to receive encoded data as part of a bitstream and store the encoded data, wherein a reference line index is signaled as part of the encoded data, the reference line index identifying a reference line of sample values used in intra-picture prediction for a current block of sample values in a picture;
• a video decoder or image decoder configured to decode the encoded data to reconstruct the picture, including performing intra-picture prediction for the current block of sample values in the picture, wherein a non-adjacent reference line of sample values is available for the intra-picture prediction, and wherein the video decoder or image decoder is configured to:
• determine a predictor for the reference line index, wherein the predictor is used to decode the reference line index;
• and
• a picture buffer configured to store the reconstructed picture for output.