Abstract
Digital still camera generally uses optical low-pass filter(OLPF) to enhance its image quality because it removes high spatial frequencies causing aliasing. However, the use of OLPF causes some loss of detail. On the other hand, when image are captured by using no OLPF, the moir is generally existed in high spatial frequency region of an image. Therefore, in this paper, moir reduction method in case of using no OLPF is suggested. To detect the moir, spatial frequency response(SFR) of camera was firstly analyzed by using ISO 12233 resolution chart. Then, moir region is detected by using the patterns that are related to the SFR of camera. next, this region is analysed in the frequency domain. Then, the moir is reduced by removing its frequency component, which represents inflection point between high frequency and DC components. Through the experimental results, it is shown that the proposed method can achieve moir reduction with preserving the detail.
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