The paper describes a design of a subjective experiment for testing the video quality of High Dynamic Range, Wide Color gamut (HDR-WCG) content at 4K resolution. Due to Covid, testing could not use a lab, so an at-home test procedure was developed. To aim for calibration despite not fully controlling the conditions and settings, we limited subjects to those who had a specific TV model, which we had previously calibrated in our labs. Moreover, we performed the experiment in the Dolby Vision mode (where the various enhancements of the TV are turned OFF by default). A browser approach was used which took control of the TV, and ensure the content was viewed at the native resolution of the TV (e.g., dot-on-dot mode). In addition, we know that video imagery is not ergodic, and there is wide variability in types of low levels features (sharpness, noise, motion, color volume, etc.) that affect both TV and visual system performance. So, a large number of test clips was used (30) and the content was specifically chosen to stress key features. The obtained data is qualitatively similar to an in-lab study and is subsequently used to evaluate several existing objective quality metrics.
TDCI (Time Domain Continuous Imaging) is a system for image capture and representation in which scene appearance is modeled as a set of continuous waveforms recording the changes in incident light at each pixel over time. Several of the advantages of TDCI are related to the ability to set exposure parameters after-the-fact, rather than at the time of capture. These exposure parameters can be far more complicated than are physically realizable in a conventional camera, or reasonable to design without the ability to repeatedly expose the same scene. Previous TDCI experiments have performed relatively traditional integration; this work explores a pair of related exposure behavior enabled by TDCI - the non-uniform integration of incident light into an image along the axes of both the time and space. This paper details a proof-of-concept implementation which ingests video frames and re-exposes images from the resulting sampled light with user-specified spatially and temporally nonuniform gain.