现代电影技术Issue(3)：14-22,9.DOI:10.3969/j.issn.1673-3215.2026.03.002
电影SDR与HDR映射结构研究
Research on the mapping structures of SDR to HDR in motion picture:Empiri-cal analysis based on ASC StEM2 test film
摘要
Abstract
Taking the American Society of Cinematographers(ASC)technical test film StEM2 as the research object,and conducting a pixel-level statistical analysis towards its 18,580 frames,this paper establishes a three-layer comparative framework and systematically analyze its luminance and color mapping structures.The framework consists of high dy-namic range EXR source data,standard dynamic range(SDR)masters,and high dynamic range(HDR)delivery masters.The results show that HDR and SDR masters exhibit a highly stable global monotonic correspondence in the luminance do-main,with overall geometric consistency preserved across images.Deviations are sparse and structurally localized,mainly appearing in self-emissive highlights and specific material regions.In the color domain,hue remains largely stable,while saturation shows a redistribution pattern characterized by expansion in midtones and compression toward both ends.The study further introduces EXR data as a physical reference to construct a decision map.Statistical results indicate that ap-proximately 82.4%of the image regions can achieve effective adaptation from SDR to HDR through physical reconstruction of the SDR version,while only limited content-aware adjustments are required in extreme highlights and certain material re-gions to match HDR dynamic range and color characteristics.The findings suggest that the SDR to HDR adaptation pro-cess can be described as constrained reconstruction mechanism,whose statistical regularities may provide useful guid-ance for algorithm development and prior design in AI models.关键词
数字电影/高动态范围(HDR)/StEM2/受限复原/逆色调映射Key words
Digital Cinema/High Dynamic Range(HDR)/StEM2/Constrained Reconstruction/Inverse Tone Mapping分类
信息技术与安全科学引用本文复制引用
张鑫,陈晓艺..电影SDR与HDR映射结构研究[J].现代电影技术,2026,(3):14-22,9.基金项目
中国电影科学技术研究所(中央宣传部电影技术质量检测所)基本科研业务费项目"LED数字电影放映屏4K/HDR视频控制技术研究"(2025-DKS-12). （中央宣传部电影技术质量检测所）
