Contrast control apparatus and method
AssigneeSamsung Electronics Co., Ltd.
InventorsHwa-Hyun Cho, Jong-Seon Kim, Bom-Yun Kim
Life of this patent
Estimating the term…
Abstract
A contrast control apparatus includes a memory for storing input image signals within one frame and an image reducing unit for selecting at least one image signal of the input image signals. An accumulation value calculating unit calculates accumulation values for predetermined sampling gray values with respect to the selected image signal. An image characteristic decision unit determines at least one characteristic of the selected image based on the accumulation values. A contrast control function calculating unit calculates a contrast control function based on the characteristic of the selected image. A contrast controller controls contrast of the image signals stored in the memory according to the contrast control function.
Claims31
A contrast control apparatus comprising:
- a memory for storing a plurality of input image signals within one frame;
- an image reducing unit for selecting at least one image signal of the input image signals;
- an accumulation value calculator for calculating accumulation values for predetermined sampling gray values with respect to the at least one selected image signal;
- an image characteristic decision unit for determining at least one characteristic of the at least one selected image signal based on the accumulation values;
- a contrast control function calculator for calculating a contrast control function based on the at least one determined characteristic of the at least one selected image signal;
- and
- a contrast controller for controlling contrast of the plurality of image signals stored in the memory according to the contrast control function.
A method for controlling contrast of an image, the method comprising:
- selecting image signals within one frame of the image to provide reduction image signals;
- calculating accumulation values corresponding to sampling gray values set in advance with respect to the reduction image signals;
- determining characteristics of the image signals based on the accumulation values and selecting an image characteristic accumulation value;
- calculating a contrast control function based on the selected image characteristic accumulation value;
- and
- controlling contrast of all image signals within the one frame according to the contrast control function.
Dependencies are inferred from the claim text.