| CPC H04N 19/124 (2014.11) | 20 Claims |
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1. An encoder comprising:
a quantization operation selection circuit configured to:
generate first data by performing a first quantization operation based on input data, the input data comprising image data of a frequency domain;
generate a feature value based on the first data; and
generate a control signal for selecting a second quantization operation or a rate-distortion optimized quantization (RDOQ) operation based on a machine learning model trained based on training data, the training data comprising the feature value; and
a quantizer configured to:
perform the second quantization operation or the RDOQ operation based on the control signal; and
generate output data.
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