Representing and reconstructing high dynamic range images

Details Representing and reconstructing high dynamic range images Representing and reconstructing high dynamic range images

G - Physics

06

T

G06T 3/40 (2006.01) G06T 5/50 (2006.01) H04N 5/91 (2006.01) H04N 7/24 (2011.01) H04N 7/26 (2006.01) H04N 7/50 (2006.01)

Patent

CA 2570090

A high dynamic range image can be recovered from a full-resolution lower--dynamic-range image and a reduced-resolution higher-dynamic-range image. Information regarding higher spatial frequencies may be obtained by extracting high spatial frequencies from the lower-dynamic-range image. In some embodiments an approximate impulse-response function is determined by comparing the higher- and lower-dynamic range images. A scaling image obtained by applying the impulse-response function to a high-frequency band of the lower-dynamic range image is combined with an upsampled higher-dynamic range image to yield a reconstructed image.

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