FREQUENCY CONTROLLED CAPACITIVE POWER CONVERTER

摘要

An image processing system analyses image data. Image data is sub-sampled (52) at a selected resolution to construct a histogram. The sub-sampling resolution is selected (50) based on at least one of: results (58) of sub-sampling operations on previous frames of the image data; available resources of the image processing system. A comparison is made between an expected control value and an actual control value obtained from sub-sampling at the selected resolution, and the sub-sampling resolution is changed based on the comparison. The method can be applied to dynamic control of the backlight (24) of a display panel (22). A power budget can be set for the image analysis based on an amount of power which is expected to be saved by reducing the intensity of the backlight (24).