Motion Controlled Dynamic Frame Insertion (MCDFI) technique is a cost effective solution for reducing motion blur on LCD panels. The key component of MCDFI is a variable low-passed filter with a ...cut-off frequency that is controlled by the motion velocity. Compared with Motion Compensated approach, its complexity is much lower. Compared with other impulse driving technologies such as Grey Frame Insertion, Dynamic Frame insertion etc, it has much less artifacts.
Media authentication and tampering localization are important in content delivery via untrusted intermediaries, such as peer-to-peer (P2P) file sharing. Many differently encoded versions of a media ...file might exist. Our previous work applied distributed source coding to authenticate the legitimate diversity of encoded images and also localize the tampered regions in an inauthentic image. The authentication/localization decoder was supplied with a Slepian-Wolf encoded image projection as authentication data. We extend our scheme to localize tampering in contrast and brightness adjusted images using an expectation maximization algorithm at the decoder. Experimental results demonstrate that tampered image blocks can be identified with high probability using data of only a few hundred bytes for a 512 times 512 image.
The concept of the motion compensated inverse filtering (MCIF) technique was proposed several years ago. The aim of the MCIF technique is to reduce the motion blur on LCD panel. In this paper, we ...first analyse the performance of the MCIF technique, then present a low cost implementation of the MCIF filter. The proposed implementation is flexible to handle various types of LCD panels.
On video formats and coding efficiency Beilers, E.B.; de Haan, G.
IEEE transactions on consumer electronics,
02/2001, Volume:
47, Issue:
1
Journal Article
Peer reviewed
This paper examines the efficiency of MPEG-2 coding for interlaced and progressive video, and compares de-interlacing and picture rate up-conversion before and after coding. We found receiver side ...de-interlacing and picture rate up-conversion (i.e. after coding) to give better image quality at a given data rate. In contrast with some other publications, we found interlaced video coding to be better than progressive video coding for many relevant sequences, even when comparing the results on a progressive display.
We present a qualitative performance evaluation of several components of a video format conversion algorithm (referred to as natural motion (NM)). The implementation platform is a new programmable ...media-processor, the TM3270, combined with dedicated hardware support. The performance of two compute-intense NM components, motion estimation (ME) and temporal up-conversion (TU), is evaluated. The impact of new TM3270 features, such as new video-processing operations and data prefetching, is quantified. We show that a real-time implementation of the ME and TU algorithms is achievable in a fraction of the available compute performance, when operating on standard definition video
Media authentication is important in content delivery via untrusted intermediaries, such as peer-to-peer (P2P) file sharing. Many differently encoded versions of a media file might exist. Our ...previous work applied distributed source coding not only to distinguish the legitimate diversity of encoded images from tampering but also localize the tampered regions in an image already deemed to be inauthentic. An authentication decoder was supplied with a Slepian-Wolf encoded image projection as authentication data. We extend our scheme to authenticate contrast and brightness adjusted images using an expectation maximization algorithm. Experimental results demonstrate that the proposed algorithm can distinguish legitimate encodings of authentic contrast and brightness adjusted images from illegitimately modified versions using authentication data of about 100 bytes.
Current methods of processing television images at the receiver are either performed globally, or locally with globally constant parameters. By contrast, greater levels of enhancement can be achieved ...if television images are segmented into regions of similar features. Then, each region is enhanced using algorithms optimized for the local properties of the segment. New methods of segmentation have been developed to allow for real-time processing at video rates. Some examples of this include grass and sky detection. We present models for color, luminance, position and texture that have been successfully used to identify grass and sky areas in TV images.
