Long-term Global Motion Compensation for Advanced Video Coding

We present a new approach to video coding that utilizes video analysis based on global motion features. For each frame to be encoded a global motion parameter set is estimated with respect to a number of previously transmitted frames. Using this global motion parameter set, a new motion compensation technique inspired by superresolution mosaicing is applied. Rate-distortion optimization is used to identify macroblocks that are only affected by global motion. For such macroblocks no prediction error is transmitted. They are purely reconstructed using long-term global motion-compensated prediction. Our results indicate significant bit rate savings compared to a state of the art H.264/AVC codec at the same visual quality

Improved Video Coding Using Long-term Global Motion Compensation

We present a new approach to video coding that utilizes video analysis based on global motion features. For each encoded frame a global motion parameter set is estimated with respect to several previously transmitted frames. Using this global motion parameter set, a new motion compensation technique inspired by super-resolution mosaicing is applied. Rate-distortion optimization is used to identify macroblocks that are only affected by global motion. For such macroblocks no prediction error is transmitted. They are purely reconstructed using long-term global motion-compensated prediction, Our results indicate significant bit-rate savings compared to a state of the art H.264/AVC video codec at the same visual quality

Video Coding Using Texture Analysis And Synthesis

A new approach to video coding is presented, where video scenes are classified into textures with subjectively relevant and irrelevant details. We apply this idea to improve video coding by using a texture analyzer and a texture synthesizer. The analyzer identifies the texture regions with no important subjective details and generates coarse masks as well as side information for the synthesizer at the decoder side. The synthesizer replaces the detail-irrelevant textures by inserting synthetic textures into the identified regions. Texture analyzer and synthesizer are based on MPEG-7 descriptors. The approach has been integrated into an H.264/AVC codec. Bit-rate savings up to 19.4 % are shown for a semiautomatic texture analyzer given similar subjective quality as the H.264/AVC codec without the presented approach

Improved renal function and blood pressure control following renal artery angioplasty : the renal artery angioplasty in patients with renal insufficiency and hypertension using a dedicated renal stent device study (PRECISION)

AIMS: To evaluate the technical performance of a dedicated renal stent device and the clinical outcome. METHODS AND RESULTS: Fifty patients with 55 renal artery stenoses (RAS) <70% (66 +/- 12 years, 58% male) were included in this non-randomised, prospective, multicentre registry. Primary endpoint was the primary patency rate at one year defined as < or =70% as determined by duplex ultrasound. Major secondary endpoints were procedural success, 30 days MACE rate, the impact of the intervention on renal function, blood pressure control, and on B-type natriuretic peptide (BNP) level. Procedural success rate was 100% and 30 days MACE rate was 0%. Restenosis rate (primary endpoint) and target lesion revascularisation rate after 12 months were 3.5% and 1.8%, respectively. After one year estimated glomerular filtration rate increased from 51 +/- 26 ml/min to 61 +/- 28 ml/min (P=0.004). Mean ambulatory blood pressure was reduced from 102 +/- 14 mmHg to 93 +/- 9 mmHg (P=0.001). Mean daily dose of antihypertensive drugs decreased from 3.0 +/- 1.7 to 2.7 +/- 1.4 (P=0.09). Mean BNP decreased from 251 +/- 282 pg/ml to 188 +/- 219 pg/ml (P=0.046) before discharge. CONCLUSIONS: Technical outcome of the tested device is favourable. The impact of the stent revascularisation on renal function and blood pressure control was promising

Sirolimus-Eluting Stents for Treatment of Infrapopliteal Arteries Reduce Clinical Event Rate Compared to Bare-Metal Stents Long-Term Results From a Randomized Trial

ObjectivesThe study investigated the long-term clinical impact of sirolimus-eluting stents (SES) in comparison with bare-metal stents (BMS) in treatment of focal infrapopliteal lesions.BackgroundThere is evidence that SES reduce the risk of restenosis after percutaneous infrapopliteal artery revascularization. No data from randomized trials are available concerning the clinical impact of this finding during long-term follow-up.MethodsThe study extended the follow-up period of a prospective, randomized, multicenter, double-blind trial comparing polymer-free SES with placebo-coated BMS in the treatment of focal infrapopliteal de novo lesions. The main study endpoint was the event-free survival rate defined as freedom from target limb amputation, target vessel revascularization, myocardial infarction, and death. Secondary endpoints include amputation rates, target vessel revascularization, and changes in Rutherford-Becker class.ResultsThe trial included 161 patients. The mean target lesion length was 31 ± 9 mm. Thirty-five (23.3%) patients died during a mean follow-up period of 1,016 ± 132 days. The event-free survival rate was 65.8% in the SES group and 44.6% in the BMS group (log-rank p = 0.02). Amputation rates were 2.6% and 12.2% (p = 0.03), and target vessel revascularization rates were 9.2% and 20% (p = 0.06), respectively. The median (interquartile range) improvement in Rutherford-Becker class was –2 (–3 to –1) in the SES group and –1 (–2 to 0) in the BMS group, respectively (p = 0.006).ConclusionsLong-term event-free survival, amputation rates, and changes in Rutherford-Becker class after treatment of focal infrapopliteal lesions are significantly improved with SES in comparison with BMS. (YUKON-Drug-Eluting Stent Below the Knee - Randomised Double-Blind Study [YUKON-BTX]; NCT00664963