System and method for real-time tone-mapping

A computer-implemented system for generating a tone-mapped output image from an input image, the system comprising:

• at least one data storage device;
• and
• at least one processor coupled to the at least one storage device, the at least one processor being configured for:
• determining a tone-curve based on a model of image contrast distortion between the input image and a tone-mapped image;
• and
• tone-mapping the input image according to the determined tone-curve;
• and
• wherein determining the tone-curve comprises analytically calculating values of the tone-curve for reducing image contrast distortion within the model of image contrast distortion;
• wherein determining the tone-curve comprises:
• defining a plurality of luminance level segments corresponding to portions of luminance levels of the input image;
• and
• determining, for each given luminance level segment, a piece-wise linear slope representing a portion of the tone-curve for the given luminance level segment.

A method for tone-mapping an input image to generate a tone-mapped output image, the method comprising:

• decomposing the input image into a base layer and a detail layer;
• determining a tone-curve based on a model of image contrast distortion between the input image and a tone-mapped image, wherein the tone-curve is determined for the base layer;
• and
• tone-mapping the input image according to the determined tone-curve, wherein the tone-mapping is applied to the base layer;
• and
• combining the detail layer with the tone-mapped base layer;
• and
• wherein determining the tone-curve comprises analytically calculating values of the tone-curve for reducing image contrast distortion within the model of image contrast distortion.

A method for tone-mapping an input image to generate a tone-mapped output image, the method comprising:

• determining a tone-curve based on a model of image contrast distortion between the input image and a tone-mapped image;
• and
• tone-mapping the input image according to the determined tone-curve;
• and
• wherein determining the tone-curve comprises analytically calculating values of the tone-curve for reducing image contrast distortion within the model of image contrast distortion;
• wherein the determination of the tone-curve is adjustable based on one or more contextual parameters;
• wherein the one or more contextual parameters comprises one or more of ambient light, peak luminance of an output display device, dynamic range of the output display device and exposure;
• and
• wherein the determination of the tone-curve comprises determining an effective output dynamic range based on the one or more of the ambient light, the peak luminance and dynamic range and generates the tone-curve based on the effective output dynamic range.

A computer-implemented system for generating a tone-mapped output image from an input image, the system comprising:

• at least one data storage device;
• and
• at least one processor coupled to the at least one storage device, the at least one processor being configured for:
• decomposing the input image into a base layer and a detail layer;
• determining a tone-curve based on a model of image contrast distortion between the input image and a tone-mapped image,
• wherein the tone-curve is determined for the base layer;
• and
• tone-mapping the input image according to the determined tone-curve, wherein the tone-mapping is applied to the base layer;
• and
• combining the detail layer with the tone-mapped base layer;
• and
• wherein determining the tone-curve comprises analytically calculating values of the tone-curve for reducing image contrast distortion within the model of image contrast distortion.

A computer-implemented system for generating a tone-mapped output image from an input image, the system comprising:

• at least one data storage device;
• and
• at least one processor coupled to the at least one storage device, the at least one processor being configured for:
• determining a tone-curve based on a model of image contrast distortion between the input image and a tone-mapped image;
• and
• tone-mapping the input image according to the determined tone-curve;
• and
• wherein determining the tone-curve comprises analytically calculating values of the tone-curve for reducing image contrast distortion within the model of image contrast distortion;
• wherein the determination of the tone-curve is adjustable based on one or more contextual parameters;
• wherein the one or more contextual parameters comprises one or more of ambient light, peak luminance of an output display device, dynamic range of the output display device and exposure;
• and
• wherein the determination of the tone-curve comprises determining an effective output dynamic range based on the one or more of the ambient light, the peak luminance and dynamic range and generates the tone-curve based on the effective output dynamic range.