Auto-contrast enhancement system
AssigneesNCKU Research and Development Foundation, Himax Technologies Limited
InventorsMING-DER SHIEH, DER-WEI YANG, YUN CHEN CHANG, TZUNG-REN WANG
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Abstract
An auto-contrast enhancement system includes a human visual system (HVS)-based local difference (LD) histogram unit configured to build a LD histogram with respect to intensity values; a histogram classifier configured to categorize histograms of input images based on distribution properties; and a histogram equalization (HE) unit configured to process the input image according to a result of the HVS-based LD histogram unit and the enhancement level determined in the histogram classifier.
Claims15
An auto-contrast enhancement system, comprising:
- a human visual system (HVS)-based local difference (LD) histogram unit coupled to receive an input pixel of an input image in order to build a LD histogram with respect to intensity values;
- a histogram classifier configured to categorize histograms of input images based on distribution properties, thereby deriving a plurality of classes;
- and
- a histogram equalization (HE) unit configured to process the input image according to a result of the HVS-based LD histogram unit and the enhancement level determined in the histogram classifier.
Dependencies are inferred from the claim text.