US 11,956,568 B2 · Video signal processing apparatus, video signal processing method, and video signal processing system

Abstract

[Object] To contribute to the achievement of a workflow in which an HDR video and an SDR video are compatible with each other. [Solving Means] This video signal processing apparatus includes an HDR video generation unit including a first converter unit that performs OOTF conversion on an HDR video by using an exponentiation function for calculating an exponentiation of 1.2, where 100% is 1, to an input signal level of the HDR video having a range from a point of 0%, where an expression range of an input signal level of an SDR video is 100%, to a change point optionally determined within a range of 100% to 500%, and by using a linear function for multiplying an input signal level of the HDR video having a range higher than the change point by a predetermined coefficient to maintain a change rate of a calculation result in a portion of the change point calculated by using the exponentiation function.

Claims14

Dependent claims

A video signal processing apparatus to generate HDR video for display on an HDR monitor, the apparatus comprising:

first circuitry configured to perforin an Opto-Optical Transfer Function (OOTF) conversion on an input video signal having a signal level, by using (1) a nonlinear function on the input video signal when the signal level is in a first range defined from a first predetermined reference point to a change point, and (2) a linear function when the signal level of the input video signal is in a second range defined from the change point to a second predetermined reference point, the OOTF conversion being analogous to OOTF conversion for an SDR video, wherein a signal level of the change point is greater than a signal level of the first predetermined reference point but less than a signal level of the second predetermined reference point such that signal levels in the first range are less than signal levels in the second range;
and
second circuitry configured to perform an Opto-Electronic Transfer Function (OETF) conversion on an output of the first circuitry and generate the HDR video for display on the HDR monitor.

A video signal processing system, comprising:

a video signal generation apparatus that generates an HDR video and an SDR video;
an HDR monitor that performs signal processing to display the HDR video generated by the video signal generation apparatus on a first monitor;
and
an SDR monitor that performs signal processing to display the SDR video generated by the video signal generation apparatus on a second monitor,
the video signal generation apparatus including
HDR video generation circuitry including
first circuitry configured to perform an OOTF conversion, by using a predetermined function, on an input video signal having a range from a predeteimined reference point to a change point determined, the OOTF conversion being analogous to OOTF conversion for the SDR video, and
SDR video generation circuitry including
second circuitry configured to perform an OETF conversion on the input video signal to generate the SDR video,
the SDR monitor including
SDR video signal processing circuitry configured to perform gamma processing using an EOTF on the SDR video generated by the video signal generation apparatus.

8 more elements

Dependencies are inferred from the claim text.

Video signal processing apparatus, video signal processing method, and video signal processing system

Life of this patent

Video signal processing apparatus, video signal processing method, and video signal processing system

Life of this patent

Abstract

Claims14