Image decoding device, image decoding method, and program

An image decoding method comprising:

• decoding control information and a quantized value;
• obtaining a decoded transform coefficient by performing inverse quantization on the decoded quantized value;
• obtaining a decoded prediction residual by performing inverse transform on the decoded transform coefficient;
• generating a first predicted sample based on a decoded sample and the decoded control information;
• accumulating the decoded sample;
• generating a second predicted sample based on the accumulated decoded sample and the decoded control information;
• generating a third predicted sample by weighted averaging using one of weighting coefficients limited based on the decoded control information for at least one of the first predicted sample or the second predicted sample;
• and
• obtaining the decoded sample by adding the decoded prediction residual and the third predicted sample.

A program stored on a non-transitory computer-readable medium for causing a computer to function as an image decoding device including a circuit, wherein

• the circuit:
• decodes control information and a quantized value;
• obtains a decoded transform coefficient by performing inverse quantization on the decoded quantized value;
• obtains a decoded prediction residual by performing inverse transform on the decoded transform coefficient;
• generates a first predicted sample based on a decoded sample and the decoded control information;
• accumulates the decoded sample;
• generates a second predicted sample based on the accumulated decoded sample and the decoded control information;
• generates a third predicted sample by weighted averaging using one of weighting coefficients limited based on the decoded control information for at least one of the first predicted sample or the second predicted sample;
• and
• obtains the decoded sample by adding the decoded prediction residual and the third predicted sample.