Image coding method and apparatus, and image decoding method and apparatus

An image decoding method, comprising:

• parsing a bitstream to acquire a decoding parameter of a decoding block;
• acquiring a scanning manner parameter according to the decoding parameter, wherein the scanning manner parameter comprises:
• a region indication parameter used for determining a scanning region of the decoding block, and/or a scanning indication parameter used for determining a scanning order of pixels in a scanning region;
• and
• determining reconstructed values of part or all of pixels in the decoding block according to the region indication parameter and/or the scanning indication parameter.

An image coding apparatus, comprising a hardware processor arranged to execute program units comprising:

• a first determination unit, configured to determine a scanning manner parameter of a coding block, wherein the scanning manner parameter comprises at least one of:
• a region indication parameter used for determining a scanning region of the coding block and a scanning indication parameter used for determining a scanning order of pixels in a scanning region of the coding block;
• a second determination unit, configured to determine predicted values of part or all of pixels in the coding block according to the scanning manner parameter;
• and
• a coding unit, configured to code the coding block according to the predicted values, and write a coding result into a bitstream.

An image decoding apparatus, comprising a hardware processor arranged to execute program units comprising:

• a first acquisition unit, configured to parse a bitstream to acquire a decoding parameter of a decoding block;
• a second acquisition unit, configured to acquire a scanning manner parameter according to the decoding parameter, wherein the scanning manner parameter comprises:
• a region indication parameter used for determining a scanning region of the decoding block, and/or a scanning indication parameter used for determining a scanning order of pixels in a scanning region;
• and
• a determination unit, configured to determine reconstructed values of part or all of pixels in the decoding block according to the region indication parameter and/or the scanning indication parameter.