최근 홀로그램(Hologram)을 광학현미경(light microscopy)에 적용하여 시료의 두께를 측정하는 방식의 연구가 활발하게 진행되고 있다. 빛의 간섭패턴(Interference pattern)을 사용하여 시료의 두께를 측정할 수 있는 이유는 시료의 두께에 따라 빛의 위상(phase)이 달라지기 때문이다. 빛의 간섭패턴을 저장하는 홀로그램에서 위상만을 분리한 후 위상을 unwrapping 하면 물체의 두께를 측정할 수 있다. JPEG은 기존의 연구방식인 시료를 통과한 홀로그램 이미지를 직접 압축하는 object 압축방식을 사용한다. 하지만 본 논문에서는 object 압축방식과 달리 홀로그램 이미지를 직접 압축하지 않고 홀로그램 이미지에서 시료의 위상(phase)만을 분리하여 위상 도메인에서 압축하는 방식을 취하였다. 이를 통해 object 압축방식에 비해 위상 도메인 압축방식에서 모든 데이터셋에 대하여 평균적으로 0.0003~0.0142 radian의 성능향상을 이룰 수 있었다.
KSP Keywords
interference pattern, light microscopy
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