| 摘要 |
A method for extracting a histogram and a cumulative distribution function (CDF) value for an image enhancement apparatus, and a circuit therefor are provided. The histogram extraction is performed during an active section of a video signal. The level of an input digital video signal is input as an address of a memory, and a data value stored at the address is increased. The processes are repeated during a one-screen period, thereby obtaining a histogram value indicating the number of samples distributed to each gray level. Also, a CDF value of each gray level is obtained by cumulatively integrating the number of samples from the lowest gray level on the basis of the histogram value obtained, during a vertical blanking period of the video signal. Therefore, the histogram/CDF extracting circuit can be built of simple hardware and an integrated structure, even though it performs both histogram and CDF extractions.
|
