METHOD AND APPARATUS FOR SIGNAL PROCESSING FOR HIGH DYNAMIC RANGE VIDEO

摘要

A method of processing a video signal from a source to produce an output signal comprises converting between a luminance value and signal value using a conversion that has a power of the luminance value for the lower range of luminance values and a logarithm of luminance value for an upper range of luminance values. Such an arrangement allows the signal to be compatible with existing transfer functions using a power law over the bottom part of the range and to maintain some compatibility with existing systems over the upper part of the range. A signal produced by the method may therefore be used both with high dynamic range and standard dynamic range displays.