IMAGE ENCODING DEVICE, IMAGE ENCODING METHOD AND PROGRAM, IMAGE DECODING DEVICE, AND IMAGE DECODING METHOD AND PROGRAM

摘要

A luminance signal of an image and a chrominance signal of a bit depth different from that of the luminance signal is input, a luminance quantization parameter used to quantize the input luminance signal in block units is generated, a chrominance quantization parameter used to quantize the input chrominance signal in block units within a range depending on the luminance quantization parameter is generated, the input luminance signal is quantized by the luminance quantization parameter, the chrominance signal is quantized by the chrominance quantization parameter, and the range is changed depending on the difference between the bit depth of the luminance signal and the chrominance signal during the generation of the chrominance quantization parameter.

主权项

1. An image encoding device comprising:
an input unit configured to input a luminance signal of an image and a chrominance signal of the image; a first determining unit configured to determine a luminance quantization parameter used to quantize the input luminance signal; a second determining unit configured to determine a chrominance quantization parameter used to quantize the input chrominance signal, the chrominance quantization parameter being a value within a range depending on a difference between a bit depth of the input luminance signal and a bit depth of the input chrominance signal; and a quantizing unit configured to quantize the input luminance signal by the luminance quantization parameter, and to quantize the input chrominance signal by the chrominance quantization parameter.