Image processing apparatus and image processing method

Patent metadata

Field	Value
Publication number	US-2016189409-A1
Application number	US-201514771258-A
Country	US
Kind code	A1
Filing date	Jun 4, 2015
Priority date	Sep 11, 2014
Publication date	Jun 30, 2016
Grant date	—

Abstract

To display images by suitably superimposing a graphics image on a high-dynamic-range image in an easily visible manner.
A dynamic range converter ( 311 ) converts a SDR graphics image to an HDR graphics image based on metadata. An image combiner ( 312 ) combines the graphics image of which the dynamic range has been converted to HDR with HDR content. A dynamic range converter ( 313 ) performs display mapping on the HDR content combined with the graphics image based on metadata.

First claim

1 . An image processing apparatus comprising:
a metadata acquiring unit that acquires metadata of image data; and a processor that processes a graphics image to be superimposed on the image data based on the metadata.

2 . The image processing apparatus according to claim 1 , wherein
the metadata acquiring unit acquires a Diffuse White luminance indicating a luminance value of white serving as a reference of the image data as the metadata, and the processor adjusts a luminance of the graphics image based on the Diffuse White luminance.

3 . The image processing apparatus according to claim 2 , wherein
the processor compares the Diffuse White luminance with a reference luminance of a display that displays the image data and adjusts the luminance of the graphics image based on the larger luminance information.

4 . The image processing apparatus according to claim 3 , wherein
the processor adjusts the luminance of the graphics image based on the reference luminance of the display when the metadata acquiring unit is unable to acquire the Diffuse White luminance of the image data.

5 . The image processing apparatus according to claim 2 , wherein
the processor compares the Diffuse White luminance with a reference luminance of a dynamic range of a predetermined luminance and adjusts the luminance of the graphics image based on the larger luminance information.

6 . The image processing apparatus according to claim 5 , wherein
the processor adjusts the luminance of the graphics image based on the reference luminance of the dynamic range of the predetermined luminance when the metadata acquiring unit is unable to acquire the Diffuse White luminance of the image data.

7 . The image processing apparatus according to claim 1 , further comprising:
a combiner that combines the graphics image processed by the processor with image data.

8 . The image processing apparatus according to claim 7 , further comprising:
a dynamic range converter that adjusts a dynamic range of the luminance of the image data combined with the graphics image so as to match a display that displays the image data.

9 . The image processing apparatus according to claim 8 , wherein
the metadata acquiring unit acquires at least one of information on a Diffuse White luminance indicating a luminance value of white serving as a reference of the image data or information on a target luminance indicating a luminance value of a main or target object of the image data (for each scene) as metadata, and the dynamic range converter adjusts the dynamic range of the luminance of the image data so as to maintain the Diffuse White luminance or the target luminance.

10 . The image processing apparatus according to claim 8 , wherein
the metadata acquiring unit acquires information on the peak luminance of the image data as the metadata, and the dynamic range converter compresses the peak luminance of the image data up to a peak luminance of the display when the peak luminance of the image data is larger than the peak luminance of the display.

11 . The image processing apparatus according to claim 8 , wherein
the metadata acquiring unit acquires information on the peak luminance of the image data and information on the Diffuse White luminance indicating the luminance value of white serving as the reference of the image data as the metadata, and when the peak luminance of the image data is larger than the peak luminance of the display, the dynamic range converter compresses the peak luminance of the image data up to the peak luminance of the display and compresses a luminance between the peak luminance and the Diffuse White luminance while maintaining the luminance equal to or lower than the Diffuse White luminance.

12 . The image processing apparatus according to claim 8 , wherein
the metadata acquiring unit acquires information on a peak luminance of the image data and information on a target luminance indicating a luminance value of a main or target object of the image data as metadata, and when the peak luminance of the image data is larger than the peak luminance of the display, the dynamic range converter compresses the peak luminance of the image data up to the peak luminance of the display and compresses a luminance between the peak luminance and the target luminance while maintaining the luminance equal to or lower than the target luminance.

13 . The image processing apparatus according to claim 8 , wherein
the metadata acquiring unit acquires information on a peak luminance of the image data, information on a Diffuse White luminance indicating a luminance value of white serving as a reference of the image data, and information on a target luminance indicating a luminance value of a main or target object of the image data as metadata, and when the Diffuse White luminance is larger than the peak luminance of the display, the dynamic range converter compresses the peak luminance of the image data up to the peak luminance of the display and compresses a luminance between the peak luminance and the target luminance while maintaining the luminance equal to or lower than the peak luminance.

14 . An image processing method comprising steps of:
acquiring metadata of image data; and processing a graphics image to be superimposed on the image data based on the metadata.

Assignees

• Sony Corp

Inventors

• Aiba Masayuki
• Eto Hiroaki

Classifications

• G09G5/10 Primary

  Intensity circuits · CPC title

• G06T15/503

  Blending, e.g. for anti-aliasing · CPC title

• G09G2340/0428

  Gradation resolution change · CPC title

• G09G5/377

  for mixing or overlaying two or more graphic patterns (G09G5/02, G09G5/397 take precedence) · CPC title

• G09G2360/16

  Calculation or use of calculated indices related to luminance levels in display data · CPC title