With the rapid increase in the number of digital stereoscopic cinemas, the quality of stereoscopic film projection has become an important technical issue that affects the audience's viewing experience. The vast majority of 3D cinemas also undertake the function of displaying 2D movies. Once a low light efficiency stereo system is selected, it will result in poor compatibility between 2D and 3D projection modes, affect the quality of film projection, and disrupt the development order of the film industry. To meet the higher viewing needs and rights of audiences for digital stereoscopic films, and ensure the sustainable development of the film industry, At the end of 2013, the State Administration of Press, Publication, Radio, Film and Television issued the guiding technical document GD/J 047-2013 "Technical Requirements and Measurement Methods for Digital Cinema Stereoscopic Projection" (hereinafter referred to as "Stereoscopic Projection Standards") We have defined multiple optical technical indicators in digital stereoscopic projection equipment and mathematical cinema stereoscopic projection systems, providing technical basis and reference for standardizing the construction of stereoscopic cinemas and the production of stereoscopic projection equipment, and taking a significant step towards standardizing the quality of stereoscopic film projection in China. The "stereoscopic projection standard" only involves the optical performance technical indicators of the digital stereoscopic projection process, and is divided into two parts: "stereoscopic projection optical system" and "stereoscopic projection equipment". The "stereoscopic projection optical system" includes projectors, stereoscopic imaging equipment, building optical environment, screens, etc. It is a specification made for the overall optical characteristics of stereoscopic cinemas, and these optical performance indicators directly affect the final viewing effect of the audience. The "stereoscopic projection equipment" only provides specifications for stereoscopic imaging equipment, and its optical performance indicators can standardize the research and production of equipment manufacturers, and also provide effective reference for cinema designers in choosing to purchase stereoscopic projection equipment
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