Cinema projection method and system
AssigneeCFGDC (BeiJing) Technology Co., Ltd.
InventorJie Wang
Life of this patent
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Abstract
A cinema projection method and system are provided, to perform GDR transformation on an original DCP while keeping a luminance component value of pure black unchanged. A transformed DCP has a brighter display luminance than the original DCP, and a display luminance of pure black remains unchanged. By adjusting the PWM, the brightness of a screen display is reduced. To ensure that the transformed DCP has a consistent display luminance with the original DCP, a luminance adjustment consistency mapping model of a local cinema is used to transform a standard PWM level of each frame of the original DCP, to obtain a local PWM level of each frame of the local cinema.
Claims8
A cinema projection method, wherein the cinema projection method comprises:
- performing global dynamic range (GDR) transformation on an original digital cinema package (DCP) based on a standard luminance component interval of a luminance component of each pixel of each frame of the original DCP, to obtain a transformed luminance component of each pixel of each transformed frame, wherein all transformed frames form a transformed DCP;
- determining a standard pulse width modulation (PWM) level of each frame of the original DCP based on a standard luminance component interval of a maximum luminance value of all pixels in each frame of the original DCP;
- transforming the standard PWM level by using a luminance adjustment consistency mapping model of a local cinema, to obtain a local PWM level of each frame of the local cinema;
- and
- based on the transformed luminance component of each pixel of each frame of the transformed DCP, determining a display luminance of each pixel of each frame of the transformed DCP on a local cinema screen by using an electro-optical transfer function (EOTF) corresponding to the local PWM level, to show the transformed DCP in the local cinema.
A cinema projection system, wherein the cinema projection system comprises a processor and a local cinema projector, wherein:
- the processor is configured to:
- transform an original DCP based on a standard luminance component interval of a luminance component of each pixel of each frame of the original DCP by using GDR transformation, to obtain a transformed luminance component of each pixel of each transformed frame, wherein all transformed frames form a transformed DCP;
- determine a standard PWM level of each frame of the original DCP based on a standard luminance component interval of a maximum luminance value of all pixels in each frame of the original DCP;
- and
- transform the standard PWM level by using a luminance adjustment consistency mapping model of a local cinema, to obtain a local PWM level of each frame of the local cinema;
- and
- the local cinema projector is configured to, based on the transformed luminance component of each pixel of each frame of the transformed DCP, determine a display luminance of each pixel of each frame of the transformed DCP on a local cinema screen by using an EOTF corresponding to the local PWM level, to show the transformed DCP in the local cinema.
Dependencies are inferred from the claim text.