영상의 휘도 분포를 이용한 LDR 영상의실시간 HDR 변환 하드웨어 구현
Real-Time LDR to HDR Conversion Hardware Implementation using Luminance Distribution
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초록
영상을 출력하는 디스플레이 기술의 발달로 인하여 영상의 해상도와 품질이 나날이 증가하고 있다. 이러한 디스플레이 기술의 발달에 맞추어, 기존의 영상들을 더 높은 해상도와 품질로 변환하여 디스플레이 할 수 있는 기술에 대한 연구가 활발하게 이루어지고 있다. 이러한 연구 결과는 이미지 신호 처리 장치에 포함되기 때문에 하드웨어 구현이 필수적으로 요구된다. 본 논문에서는, 영상의 휘도 분포를 이용한 LDR(Low Dynamic Range) 영상의 실시간 HDR(High Dynamic Range) 변환 하드웨어 구현을 제안한다. 제안하는 방법은 휘도 분포의 히스토그램을 이용하여 영상의 특징을 추출하고, 이를 바탕으로 하여휘도와 색상을 확장한다. 또한, 제안한 알고리즘을 하드웨어 IP(Intellectual Property)로 설계하여 그 성능을 검증하였을 때,최대 동작 주파수 265.46MHz로 4K DCI(Digital Cinema Image) 영상에 대하여 30fps로 동작하여 4K 표준에 대응할 수 있음을 확인하였다.
Abstract
Due to the development of display technologies for images, the resolution and quality of images are increasing day byday. In accordance with the development of the display technology, researches have been actively conducted ontechnologies for converting and displaying existing images to higher resolution and quality. Since the results of thesesstudies are included in the image signal processor, hardware implementation is indispensable. In this paper, we proposea real-time HDR(High Dynamic Range) conversion hardware implementation of LDR(Low Dynamic Range) image usingluminance distribution. The proposed method extracts the features of the image using the histogram of the luminancedistribution, and extends the luminance and color based on the extracted features. In addition, when the proposed methodis designed by hardware IP(Intellectual Property) and its performance is verified, 4K DCI(Digital Cinema Image) can behandled at a rate of 30fps at 265.46MHz
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