SMPTE 2017: Core Color Rendering Algorithms For High Dynamic Range Display

The accompanying technical manuscript for this presentation is available here: http://ieeexplore.ieee.org/document/8281440/

The spatial performances or resolutions of UHD 4K/8K cameras are of primary importance. We present a system capable of measuring the modulation transfer function (MTF) of a broadcast camera based on its knife-edge responses in real time. The measurement system consists of a PC with a frame memory fed with an HD-SDI video signal in its linear range. This method can be applied to multiple edges in arbitrary directions, unlike the conventional slanted-edge method in the ISO 12233 standard in which only a near-horizontal or vertical edge in a rectangular region of interest can be analyzed. The new measurement system significantly facilitates the evaluation of the performances of the camera and lens as well as accurate focusing in an objective manner. If the optical axis of a zoom lens surface is directly facing a large knife-edge chart with the edge positioned at the image center, the MTF can be continuously observed from the wide end to the telephoto end while operating the zoom, making it very easy to adjust the flange focal distance as well as to obtain the spatial resolution characteristics over the zoom range. The lens aperture that maximizes the MTF, which is usually between F3 and F4, can be found by continuously analyzing an off-axis edge while controlling the iris. Analysis of multidirectional edges on a starburst chart yields a contour plot of multidirectional MTFs that enables direct observation of the anisotropy due to not only the camera and lens performance and conditions (e.g., misalignment of the optical axis of the lens and image sensor), but also the pixel structure of the image sensor and image processing (e.g., demosaicing and detail adjustment). Thus, the real-time multidirectional MTF measurement system provides a means of thoroughly assessing the spatial resolution performances of UHD cameras.

Presented By: Doug Walker and Gary Demos

SMPTE (pronounced "simp-tee"), the organization whose standards work has supported a century of advances in entertainment technology and whose membership spans the globe, holds the SMPTE Annual Technical Conference & Exhibition in Los Angeles each October. The event is considered the world's premier forum for the exploration of media and entertainment technology. More information about this year’s upcoming event is available at www.smpte2018.org.

The people of the Society of Motion Picture and Television Engineers, or SMPTE, have sorted out the details of many significant advances in media and entertainment technology, from the introduction of "talkies" and color television to HD and UHD (4K, 8K) TV. Since its founding in 1916, SMPTE has received an Oscar® and multiple Emmy® Awards for its work in advancing moving-imagery engineering across the industry. SMPTE has developed thousands of standards, recommended practices, and engineering guidelines, more than 800 of which are currently in force today. SMPTE Time Code™ and the ubiquitous SMPTE Color Bars™ are just two examples of SMPTE's notable work. As it enters its second century, SMPTE is shaping the next generation of standards and providing education for the industry to ensure interoperability as the industry evolves further into IT- and IP-based workflows. Visit www.smpte.org for more information.

SMPTE's global membership today includes more than 7,000 members: motion-imaging executives, creatives, technologists, researchers, and students who volunteer their time and expertise to SMPTE's standards development and educational initiatives. A partnership with the Hollywood Professional Association (HPA) connects SMPTE and its membership with the businesses and individuals who support the creation and finishing of media content. Information on joining SMPTE is available at www.smpte.org/join.

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