According to an embodiment, a decoding device includes an acquiring unit configured to acquire first format information, encoded data, and first filter information, the first format information indicating a resolution of a color-difference component of the encoded data; a decoding unit configured to decode the encoded data to obtain a decoded image; and a converting unit configured to convert a color-difference format of the decoded image represented by a first color-difference format by using a filter identified by the filter information.

Provided are an image processing apparatus and method, which use a maximum display luminance value of a mastering display and a maximum display luminance value of a target display according to luminance characteristics of a current scene of an encoded image.

Provided are an image processing apparatus and method, which use a maximum display luminance value of a mastering display and a maximum display luminance value of a target display according to luminance characteristics of a current scene of an encoded image.

A conversion method for converting luminance of a video, including a luminance value in a first luminance range, to be displayed on a display apparatus includes: acquiring a first luminance signal indicating a code value obtained by quantization of the luminance value of the video; and converting the code value indicated by the acquired first luminance signal into a second luminance value determined based on a luminance range of the display apparatus, the second luminance value being compatible with a second luminance range with a maximum value smaller than a maximum value of the first luminance range and larger than 100 nit. This provides the conversion method capable of achieving further improvement.

A conversion method for converting luminance of a video, including a luminance value in a first luminance range, to be displayed on a display apparatus includes: acquiring a first luminance signal indicating a code value obtained by quantization of the luminance value of the video; and converting the code value indicated by the acquired first luminance signal into a second luminance value determined based on a luminance range of the display apparatus, the second luminance value being compatible with a second luminance range with a maximum value smaller than a maximum value of the first luminance range and larger than 100 nit. This provides the conversion method capable of achieving further improvement.

A frame generation apparatus including an image division section configured to, in a case where a horizontal-direction pixel number in a video signal is set to integers of 0 to N1 and a vertical-direction line number in the video signal is set to integers of 0 to M1, perform an operation of dividing a pixel group included in a line of which the vertical-direction line number is 2m and a pixel group included in a line of which the vertical-direction line number is (2m+1) on a basis of color format information of the video signal, for all integers m satisfying 0m(M/2)1, and thereby obtain a plurality of divided signals, and a frame generation section configured to generate a plurality of frames individually including the plurality of divided signals.

A frame generation apparatus including an image division section configured to, in a case where a horizontal-direction pixel number in a video signal is set to integers of 0 to N1 and a vertical-direction line number in the video signal is set to integers of 0 to M1, perform an operation of dividing a pixel group included in a line of which the vertical-direction line number is 2m and a pixel group included in a line of which the vertical-direction line number is (2m+1) on a basis of color format information of the video signal, for all integers m satisfying 0m(M/2)1, and thereby obtain a plurality of divided signals, and a frame generation section configured to generate a plurality of frames individually including the plurality of divided signals.

The image generation apparatus includes: an acquisition unit configured to acquire a base image, a reference image, the respective exposure values associated with the base image and the reference image, and a pseudo-exposure value different from the respective exposure values associated with the base image and the reference image; an estimation unit configured to estimate a conversion parameter; and a generation unit configured to generate a pseudo-image regarded as an image photographed with the pseudo-exposure value by converting the luminance value of the base image for each of the pixels based on the respective exposure values associated with the base image and the reference image, the pseudo-exposure value, and the conversion parameter.

The image generation apparatus includes: an acquisition unit configured to acquire a base image, a reference image, the respective exposure values associated with the base image and the reference image, and a pseudo-exposure value different from the respective exposure values associated with the base image and the reference image; an estimation unit configured to estimate a conversion parameter; and a generation unit configured to generate a pseudo-image regarded as an image photographed with the pseudo-exposure value by converting the luminance value of the base image for each of the pixels based on the respective exposure values associated with the base image and the reference image, the pseudo-exposure value, and the conversion parameter.

In a method to reconstruct a high dynamic range video signal, a decoder receives parameters in the input bitstream to generate a prediction function. Using the prediction function, it generates a first set of nodes for a first prediction lookup table, wherein each node is characterized by an input node value and an output node value. Then, it modifies the output node values of one or more of the first set of nodes to generate a second set of nodes for a second prediction lookup table, and generates output prediction values using the second lookup table. Low-complexity methods to modify the output node value of a current node in the first set of nodes based on computing modified slopes between the current node and nodes surrounds the current node are presented.