Methods and apparatuses for processing or defining luminance/color regimes

An apparatus for processing an input image signal (O), coded for a given luminance dynamic range having a peak white luminance, to be rendered based on a description data signal (DDO) that comprises an encoding of image defining information related to the input image signal (O), said apparatus comprising:

• an extractor adapted to extract, from the description data signal (DDO), descriptive data (D), wherein the descriptive data (D) comprises predetermined data that specifies at least one luminance regime, wherein the at least one luminance regime comprises a regime based upon both (i) at least luminance value information for the at least one luminance regime, and (ii) regime descriptor (rd) information, wherein the regime descriptor (rd) information comprises information that defines one or more tone reproduction curve applicable for both (ii)(a) the at least one luminance regime and (ii)(b) at least two luminance dynamic ranges of rendering display devices with respective peak white luminances different from the peak white luminance of the given luminance dynamic range of the input image signal (O);
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• an image processing unit adapted to process the input image signal (O) in response to the regime descriptor (rd) information to obtain a luminance regime improved output image (IR′) to be rendered in an output luminance dynamic range, wherein the output luminance dynamic range comprises a dynamic range of the at least two luminance dynamic ranges of rendering display devices with respective peak white luminances different from the peak white luminance of the given luminance dynamic range of the input image signal (O), wherein the image processing unit is further configured to apply a mapping of the one or more tone reproduction curve as defined in the regime descriptor (rd) information to at least a subset of pixels of the input image identified via the at least luminance value information of the at least one luminance regime of the descriptive data (D), wherein the applying includes mapping input luminances of the identified at least a subset of pixels of the input image of the at least one luminance regime to output luminances of said pixels via the one or more tone reproduction curve defined in the regime descriptor (rd) information to effect a rendering of the luminance regime improved output image (IR′) in the output luminance dynamic range of the at least two luminance dynamic ranges of rendering display devices with respective peak white luminances different from the peak white luminance of the given luminance dynamic range of the input image signal (O).

A method of processing an input signal coded for a given luminance dynamic range having a peak white luminance and representative of an original image, the input signal further including descriptive data (D), added by a reviewer of a displaying of the original image, in a description data signal (DDO), said method comprising:

• extracting from the input signal the descriptive data (D) added by the reviewer, said descriptive data (D), wherein the descriptive data (D) comprises predetermined data that specifies at least one luminance regime, wherein the at least one luminance regime comprises a regime based upon both (i) identification information for at least one subset of pixels of the original image and (ii) regime descriptor (rd) information, wherein the regime descriptor (rd) information comprises information that defines an appearance or luminance rendering specification for both (ii)(a) the at least one subset of pixels of the original image that specifies the at least one luminance regime and (ii)(b) at least two luminance dynamic ranges of receiving-side video displays with respective peak white luminances different from the peak white luminance of the given luminance dynamic range of the input signal, further for a representation of the original image to be rendered on one of at least two receiving-side video displays having different output luminance dynamic ranges with respective peak white luminances;
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• using the extracted descriptive data (D) to effect a rendering of a luminance regime improved image representative of the original image in an output luminance dynamic range, wherein the output luminance dynamic range comprises a dynamic range of the at least two dynamic ranges of the receiving-side video displays with respective peak white luminances different from the peak white luminance of the given luminance dynamic range, and having an appearance of said at least one subset of pixels of the original image of the at least one luminance regime that is representative of the appearance or luminance rendering specification of the at least one luminance regime as defined via the regime descriptor (rd) information.

An apparatus for processing an input signal coded for a given luminance dynamic range having a peak white luminance and representative of an original image, the input signal further including descriptive data (D), added by a reviewer of a displaying of the original image, in a description data signal (DDO), said apparatus comprising:

• an extractor for extracting from the input signal the descriptive data (D) added by the reviewer, said descriptive data (D), wherein the descriptive data (D) comprises predetermined data that specifies at least one luminance regime, wherein the at least one luminance regime comprises a regime based upon both (i) identification information for at least one subset of pixels of the original image and (ii) regime descriptor (rd) information, wherein the regime descriptor (rd) information comprises information that defines an appearance or luminance rendering specification for both (ii)(a) the at least one subset of pixels of the original image that specifies that at least one luminance regime and (ii)(b) at least two luminance dynamic ranges of receiving-side video displays with respective peak white luminances different from the peak white luminance of the given luminance dynamic range of the input signal, further for a representation of the original image to be rendered on one of at least two receiving-side video displays having different output luminance dynamic ranges with respective peak white luminances;
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• an image processing unit adapted to use the extracted descriptive data (D) to effect a rendering of a luminance regime improved image representative of the original image in an output luminance dynamic range, wherein the output luminance dynamic range comprises a dynamic range of the at least two dynamic ranges of the receiving-side video displays with respective peak white luminances different from the peak white luminance of the given luminance dynamic range, and having an appearance of said at least one subset of pixels of the original image of the at least one luminance regime that is representative of the appearance or luminance rendering specification of the at least one luminance regime as defined via the regime descriptor (rd) information.

A method of adding display rendering specification information to an input image (I) coded for a given luminance dynamic range having a peak white luminance, the input image being from a set of video images, the display rendering specification information being usable by a receiving-side luminance processing apparatus to control a luminance regime improved rendering of at least luminance of subsets of image pixels corresponding to at least one luminance regime of the input image for at least two luminance dynamic ranges of receiving-side video displays with respective peak white luminances different from the peak white luminance of the given dynamic range of the input image, the at least two receiving-side video displays further having different output luminance dynamic ranges with respective peak white luminances, said method comprising:

• displaying, via a display device, the input image to a reviewer;
• receiving, via at least a user interface, user interface commands (CU) from the reviewer and converting, via a data handler, the user interface commands (CU) to display rendering specification information or descriptive data (D) specifying the at least one luminance regime subset of pixels in the input image, wherein the display rendering specification information or descriptive data (D) comprises data that specifies at least one luminance regime, wherein the at least one luminance regime comprises a regime based upon both (i) identification information for at least one subset of pixels of the input image and (ii) regime descriptor (rd) information, wherein the regime descriptor (rd) information comprises information that encodes a luminance rendering specification for both (ii)(a) the at least one subset of pixels of the input image that specifies the at least one luminance regime and (ii)(b) the at least two luminance dynamic ranges of receiving-side video displays with respective peak white luminances different from the peak white luminance of the given luminance dynamic range of the input image, further for a representation of the input image to be rendered on one of the at least two receiving-side video displays having different output luminance dynamic ranges with respective peak white luminances, wherein the regime descriptor (rd) information further comprises a parametric formulation of luminance rendering for a luminance regime as a function of at least a display white luminance that corresponds with a peak white luminance or maximum achievable brightness of a display, so that a receiving-side luminance processing apparatus for a receiving-side video display can determine the luminance regime improved rendering based upon (a) an actual value of display white luminance for the receiving-side video display and (b) the parametric formulation;
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• encoding (i) the display rendering specification information or descriptive data (D) into an output description data signal (DDO) as metadata in a video transmission encoding signal (S′) suitable for communicating video to a receiving-side apparatus, and (ii) an image (O) of pixels, derived from the input image, according to a video transmission encoding definition for the video transmission encoding signal (S′).

An image analysis apparatus for adding display rendering specification information to an input image (I) coded for a given luminance dynamic range having a peak white luminance, the input image being from a set of video images, the display rendering specification information being usable by a receiving-side luminance processing apparatus to control a luminance regime improved rendering of at least luminance of subsets of image pixels corresponding to at least one luminance regime the input image for at least two luminance dynamic ranges of receiving-side video displays with respective peak white luminances different from the peak white luminance of the given luminance dynamic range of the input image, the at least two receiving-side video displays further having different output luminance dynamic ranges with respective peak white luminances, said image analysis apparatus comprising:

• a display device for displaying the input image to a reviewer;
• a user interface for receiving user interface commands (CU) from the reviewer;
• a data handler for converting the user interface commands (CU) to display rendering specification information or descriptive data (D) specifying the at least one luminance regime subset of pixels in the input image, wherein the display rendering specification information or descriptive data (D) comprises data that specifies at least one luminance regime, wherein the at least one luminance regime comprises a regime based upon both (i) identification information for at least one subset of pixels of the input image and (ii) regime descriptor (rd) information, wherein the regime descriptor (rd) information comprises information that encodes a luminance rendering specification for both (ii)(a) the at least one subset of pixels of the input image that specifies the at least one luminance regime and (ii)(b) the at least two luminance dynamic ranges of receiving-side video displays with respective peak white luminances different from the peak white luminance of the given luminance dynamic range of the input image, further for a representation of the input image to be rendered on one of the at least two receiving-side video displays having different output luminance dynamic ranges with respective peak white luminances, wherein the regime descriptor (rd) information further comprises a parametric formulation of luminance rendering for a luminance regime as a function of at least a display white luminance that corresponds with a peak white luminance or maximum achievable brightness of a display, so that a receiving-side luminance processing apparatus for a receiving-side video display can determine the luminance regime improved rendering based upon (a) an actual value of display white luminance for the receiving-side video display and (b) the parametric formulation;
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• a data encoder for encoding (i) the display rendering specification information or descriptive data (D) into an output description data signal (DDO) as metadata in a video transmission encoding signal (S′) suitable for communicating video to a receiving-side apparatus, and (ii) an image (O) of pixels, derived from the input image, according to a video transmission encoding definition for the video transmission encoding signal (S′).

A method of processing an input image signal (O) coded for a given luminance dynamic range having a peak white luminance and representative of images that comprise video images which are encoded in a video transmission encoding suitable for communicating an input image signal of video to a video rendering-side, the video images for being processed to be rendered in an output luminance dynamic range of at least two dynamic ranges of rendering-side video displays with respective peak white luminances different from the peak white luminance of the given luminance dynamic range on one of various rendering-side video displays having different output luminance dynamic ranges with respective peak white luminances, and the processing being based on display rendering specification information or descriptive data (D) of an output description data signal (DDO) related to the video images, said method comprising:

• extracting from an encoding of the output description data signal (DDO), the display rendering specification information or descriptive data (D) for at least one luminance regime, wherein the display rendering specification information or descriptive data (D) comprises data that specifies at least one luminance regime, wherein the at least one luminance regime comprises a regime based on both (i) identification information for at least one subset of pixels of the input image, and (ii) regime descriptor (rd) information, wherein the regime descriptor (rd) information comprises information that encodes a luminance rendering specification for both (ii)(a) the at least one subset of pixels of the at least one luminance regime and (ii)(b) the at least two dynamic ranges of rendering-side video displays with respective peak white luminances different from the peak white luminance of the given luminance dynamic range of the input image signal, further for a representation of the input image to be rendered on one of at least two of the various rendering-side video displays having different output luminance dynamic ranges with respective peak white luminances, wherein the regime descriptor (rd) information further comprises a parametric formulation of luminance rendering for a luminance regime as a function of at least a display white luminance that corresponds with a peak white luminance or maximum achievable brightness of a display;
• determining a value of the display white luminance of a particular rendering-side video display of the various rendering-side video displays having different output luminance dynamic ranges;
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• image processing the input image signal (O) to obtain a luminance regime improved output image (IR′) for the particular rendering-side video display to be rendered based upon a processing determined from at least (i) the display white luminance value of the particular rendering-side video display, and (ii) the parametric formulation of the luminance rendering as a function of at least a display white luminance that corresponds with a peak white luminance or maximum achievable brightness of a display.