Impact of camera pixel count and monitor resolution perceptual image quality

Traditional 35mm film cameras are no longer the main devices today's consumers use to capture images. Though the dominant technology has shifted to digital cameras and displays that differ widely in pixel count and resolution, our understanding of the quality impact of these variables lags. This paper explores the quality impact of resolution within this new paradigm. Images were collected from 23 cameras, ranging from a 1 megapixel (MP) mobile phone to a 20 MP digital single-lens reflex camera (DSLR). Subjective ratings from three labs were used to explore the relationship between the camera's pixel count, the display resolution, and the overall perceived quality. This dataset and subjective ratings will be made available on the Consumer Digital Video Library (CDVL, www.cdvl.org) when this paper is published. These images can be used royalty free for research and development purposes

Interoperable conditional access with video selective encryption for portable devices

The pay-TV industry seeks to extend its reach to portable display devices. At the same time, it seeks to ensure a horizontal market by making interoperable the Conditional Access Systems (CASs) employed to protect content. To achieve interoperability for such devices, this paper proposes a form of selective encryption for video that allows simultaneous distribution of a small percentage of video data on a per-CAS basis, allowing sharing of the unencrypted video between the CASs. The bitrate overhead for each additional CAS enabled is found to be on average 7.41 %, whereas the computational overhead amounts to no more than 40 ms for the benchmark sequences tested. Adaptation of CAS to transparent encryption of scalable video is also demonstrated in this paper