REPRODUCTION METHOD AND REPRODUCTION APPARATUS

• US 20160344990A1
• Filed: 08/02/2016
• Published: 11/24/2016
• Est. Priority Date: 09/22/2014
• 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: KOZUKA, MASAYUKI, NISHI, TAKAHIRO, TERADA, KENGO, TOMA, TADAMASA
• Granted Patent: US 9,794,539 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: G06T 5/90 Dynamic range modification of images or parts thereof
• CPC Class Codes: G09G 2320/0673 for control of gamma adjustment, e.g. selecting another gamma curve
• CPC Class Codes: G09G 2340/06 Colour space transformation
• CPC Class Codes: G09G 5/00 Control arrangements or circuits for visual indicators common to cathode-ray tube indicators and other visual indicators image data processing or generation, in general G06T
• CPC Class Codes: G09G 5/10 Intensity circuits
• CPC Class Codes: G11B 27/00 Editing; Indexing; Addressing; Timing or synchronising; Monitoring; Measuring tape travel
• CPC Class Codes: H04N 11/24 High-definition television systems
• CPC Class Codes: H04N 21/234 Processing of video elementary streams, e.g. splicing of video streams or manipulating encoded video stream scene graphs
• CPC Class Codes: H04N 21/431 Generation of visual interfaces for content selection or interaction; Content or additional data rendering
• CPC Class Codes: H04N 21/4318 by altering the content in the rendering process, e.g. blanking, blurring or masking an image region image enhancement or restoration in general G06T5/00
• CPC Class Codes: H04N 21/435 Processing of additional data, e.g. decrypting of additional data, reconstructing software from modules extracted from the transport stream
• CPC Class Codes: H04N 21/43635 HDMI
• CPC Class Codes: H04N 21/4402 involving reformatting operations of video signals for household redistribution, storage or real-time display details of conversion of video standards at pixel level H04N7/01; video transcoding H04N19/40; adapting incoming signals to the display format of the display terminal G09G5/005; media handling at the source in data packet switching networks H04L65/764
• CPC Class Codes: H04N 21/4516 involving client characteristics, e.g. Set-Top-Box type, software version or amount of memory available
• CPC Class Codes: H04N 21/4518 involving characteristics of one or more peripherals, e.g. peripheral type, software version, amount of memory available or display capabilities
• CPC Class Codes: H04N 5/202 Gamma control circuits for controlling camera response irrespective of the scene brightness H04N23/82
• CPC Class Codes: H04N 9/646 for image enhancement, e.g. vertical detail restoration, cross-colour elimination, contour correction, chrominance trapping filters
• CPC Class Codes: H04N 9/87 Regeneration of colour television signals H04N9/80 takes precedence

Abstract

In a reproduction method, a first video stream has a first dynamic range where a maximum value of a luminance dynamic range is more than 100 nits, and a display apparatus displays video in a second dynamic range narrower than the first dynamic range. The method includes: determining whether the first video stream is quantized based on a hybrid OETF; (i) when it is determined that the first video stream is quantized based on the hybrid OETF, reproducing the first video stream; and (ii) when it is determined that the first video stream is not quantized based on the hybrid OETF, converting a luminance dynamic range of the first video stream from the first dynamic range to the second dynamic range to obtain a second video stream, and reproducing the second video stream.

Claims

1. A reproduction method comprising:

determining whether a first video stream is quantized based on a hybrid OETF, the first video stream has a first dynamic range where a maximum value of a luminance dynamic range is more than 100 nits;

(i) when it is determined that the first video stream is quantized based on the hybrid OETF, obtaining a first reproduction signal by reproducing the first video stream, and outputting the first reproduction signal to a display apparatus, the display apparatus displays video in a second dynamic range narrower than the first dynamic range; and

(ii) when it is determined that the first video stream is not quantized based on the hybrid OETF, converting a luminance dynamic range of the first video stream from the first dynamic range to the second dynamic range to obtain a second video stream, obtaining a second reproduction signal by reproducing the second video stream, and outputting the second reproduction signal to the display apparatus.

2. The method according to claim 1, wherein the hybrid OETF is an OETF that supports the first dynamic range and that is compatible with an OETF that supports the second dynamic range in a low-luminance area.

3. The method according to claim 1, wherein when the first video stream is not quantized based on the hybrid OETF, the video stream is quantized using an SMPTE 2084 OETF.

4. The method according to claim 1, wherein the first video stream includes information indicating whether the video stream is quantized based on the hybrid OETF.

5. The method according to claim 1, wherein when the first video stream is quantized based on the hybrid OETF, the video stream includes, as static metadata, information provided by mastering display color volume SEI message, and peak luminance information indicating a peak luminance of content provided by the video stream.

6. The method according to claim 5, wherein the peak luminance of content is 1000 nits.

7. The method according to claim 1, wherein the first reproduction signal is obtained without performing a process of converting the luminance dynamic range of the first video stream from the first dynamic range to the second dynamic range.

8. A reproduction apparatus comprising one or more memories;

and circuitry which, in operation;

determines whether a first video stream is quantized based on a hybrid OETF, the first video stream has a first dynamic range where a maximum value of a luminance dynamic range is more than 100 nits;

(i) when it is determined that the first video stream is quantized based on the hybrid OETF, obtains a first reproduction signal by reproducing the first video stream, and outputs the first reproduction signal to a display apparatus, the display apparatus displays video in a second dynamic range narrower than the first dynamic range; and

(ii) when it is determined that the first video stream is not quantized based on the hybrid OETF, converts a luminance dynamic range of the first video stream from the first dynamic range to the second dynamic range to obtain a second video stream, obtains a second reproduction signal by reproducing the second video stream, and outputs the second reproduction signal to the display apparatus.

9. The apparatus according to claim 8, wherein the first reproduction signal is obtained without performing a process of converting the luminance dynamic range of the first video stream from the first dynamic range to the second dynamic range.