Encoding device, decoding device, encoding method, and decoding method

Abstract

An encoding deviceincludes: a transformation unitconfigured to calculate an orthogonal transform coefficient by performing an orthogonal transformation process on a residual image indicating a difference between the input image and a predicted image of the input image; a quantization unitconfigured to generate a quantization coefficient by quantizing the orthogonal transform coefficient on the basis of a quantization parameter; an entropy encoding unitconfigured to generate encoded data by encoding the quantization coefficient; an image decoding unitconfigured to restore an orthogonal transform coefficient from the quantization coefficient on the basis of the quantization parameter and generate a reconstructed image by adding the predicted image to a residual image restored by performing inverse orthogonal transformation on the orthogonal transform coefficient; and a deblocking filtering unitconfigured to perform a filtering process on the reconstructed image, wherein the deblocking filtering unitcontrols a filtering strength depending on a luminance signal level of the reconstructed image and the quantization parameter.