Conversion method and conversion apparatus

• US 10,051,233 B2
• Filed: 05/15/2017
• Issued: 08/14/2018
• Est. Priority Date: 06/10/2014
• Status: Active Grant

• Current Assignee: Panasonic Intellectual Property Management Co., Ltd. (Panasonic Holdings Corporation)
• Original Assignee: Panasonic Intellectual Property Management Co., Ltd. (Panasonic Holdings Corporation)
• Inventors: Toma, Tadamasa, Terada, Kengo, Kozuka, Masayuki, Nishi, Takahiro
• Primary Examiner(s): Teitelbaum, Michael
• Application Number:
  US15/595,012
• Publication Number:
  US 20170251167A1
• Time in Patent Office: 456 Days
• Field of Search: 348453, 348452, 348458, 348459, 348489, 348441, 348370, 3483961, 3483971, 348631, 348708, 348712, 348714, 348719, 348725, 348 27, 348 33, 348 34, 348 68, 348 70, 348131, 348234, 348235, 348236, 348269, 37524002, 37524003, 37524001, 37524026, 345102, 345213, 345589
• CPC Class Codes: G06F 3/14 Digital output to display device ; Cooperation and interconnection of the display device with other functional units
• CPC Class Codes: G06T 2207/20208 High dynamic range [HDR] image processing
• CPC Class Codes: G06T 5/92 based on global image properties
• CPC Class Codes: G09G 2320/0276 for the purpose of adaptation to the characteristics of a display device, i.e. gamma correction
• CPC Class Codes: G09G 2370/04 Exchange of auxiliary data, i.e. other than image data, between monitor and graphics controller
• CPC Class Codes: G09G 5/026 Control of mixing and/or overlay of colours in general G09G5/022 and G09G5/024 take precedence
• CPC Class Codes: G09G 5/10 Intensity circuits
• CPC Class Codes: H04N 11/20 Conversion of the manner in which the individual colour picture signal components are combined, e.g. conversion of colour television standards
• CPC Class Codes: H04N 21/4621 Controlling the complexity of the content stream or additional data, e.g. lowering the resolution or bit-rate of the video stream for a mobile client with a small screen arrangements for using the results of monitoring on user's side in broadcast systems H04H60/65; flow control in packet networks H04L47/10
• CPC Class Codes: H04N 23/71 Circuitry for evaluating the brightness variation
• CPC Class Codes: H04N 23/76 by influencing the image signals
• CPC Class Codes: H04N 5/20 Circuitry for controlling amplitude response
• CPC Class Codes: H04N 7/01 Conversion of standards , e.g. involving analogue television standards or digital television standards processed at pixel level
• CPC Class Codes: H04N 7/0102 involving the resampling of the incoming video signal
• CPC Class Codes: H04N 7/0125 one of the standards being a high definition standard
• CPC Class Codes: H04N 7/015 High-definition television systems
• CPC Class Codes: H04N 9/64 Circuits for processing colour signals H04N9/77 takes precedence; camera processing pipelines for processing colour signals H04N23/84
• CPC Class Codes: H04N 9/642 Multi-standard receivers

Abstract

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.

Claims

1. A playback apparatus comprising:

a first electro-optical transfer function (EOTF) converter that receives a video signal having a first luminance range and performs EOTF conversion on the video signal to generate a video linear signal having the first luminance range;

a second EOTF converter that receives a graphics signal having a third luminance range and performs EOTF conversion on the graphics signal to generate a graphics linear signal having the first luminance range;

a combiner that combines the video linear signal with the graphics linear signal to generate a composite signal having the first luminance range;

a first luminance converter that converts the first luminance range of the composite signal into a second luminance range, a maximum value of the second luminance range being smaller than a maximum value of the first luminance range, and the maximum value of the second luminance range being larger than a maximum value of the third luminance range;

a second luminance converter that converts the second luminance range of the composite signal into the third luminance range; and

an inverse EOTF converter that performs inverse EOTF conversion on the composite signal having the third luminance range and outputs the composite signal subjected to the inverse EOTF conversion.

2. The playback apparatus according to claim 1, wherein

the graphics signal is a signal for displaying a subtitle or a menu.

3. The playback apparatus according to claim 1, wherein

the video signal is a high dynamic range signal having the first luminance range, and

the graphics signal is a standard dynamic range signal having the third luminance range.

4. A playback method comprising:

receiving a video signal having a first luminance range and performing electro-optical transfer function (EOTF) conversion on the video signal to generate a video linear signal having the first luminance range;

receiving a graphics signal having a third luminance range and performing EOTF conversion on the graphics signal to generate a graphics linear signal having the first luminance range;

combining the video linear signal with the graphics linear signal to generate a composite signal having the first luminance range;

converting the first luminance range of the composite signal into a second luminance range, a maximum value of the second luminance range being smaller than a maximum value of the first luminance range, and the maximum value of the second luminance range being larger than a maximum value of the third luminance range;

converting the second luminance range of the composite signal into the third luminance range; and

performing inverse EOTF conversion on the composite signal having the third luminance range and outputting the composite signal subjected to the inverse EOTF conversion.