Local adaptive tone mapping with composite multiple gamma functions

We describe a high-speed method of correcting and compressing the dynamic range of images that can be operated intuitively and naturally. Adaptive operations are conducted for shadow, middle, and highlight tones in the local areas of images. Although natural image processing can be achieved with default parameters, we can set the parameters for each of these three tones individually and intuitively. We attained two million pixels per 0.3 sec of operation and real-time VGA movie processing without the need for SIMD instruction, multi-thread operation, or additional hardware by using the Athlon64 X2 3800+ CPU.