电影SDR与HDR映射结构研究OA

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.