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H.264 allows motion estimation performing on multiple reference frames. This new feature improves the prediction accuracy of inter-coding blocks significantly, but it is extremely computational intensive. The reference software JM adopts full search scheme, and the increased computation load is in proportion to the number of searched reference frames. However, the reduction of prediction residues is highly dependent on the content of sequences, not on the number of searched frames. In this letter, we propose an adaptive and fast multiframe selection algorithm (AFMFSA) to speed up the searching procedure for multiple reference frames. Simulation results show that the proposed algorithm can deduct 56.0%-74.2% computation load of motion estimation on average.

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This study was supported by grants of New Ideas Capability for Backbone Teachers in Universities of Heilongjiang and of Scientific Research foundation in Qiqihar Medical College. Background/ Aims: Ulcer recurrence and poor healing may be critically important to the development of serious gastrointestinal complications in patients with long-term non-steroid anti-inflammatory drugs (NSAIDs). The present study is to investigate the effects of aspirin on ulcer recurrence and healing quality and to explore the mechanism. Methods: Gastric ulcers were induced with acetic acid in rats; aspirin was administrated by gavage from day 25 to day 54 after ulcer induction. The gastric juice volume, pH, gastric mucus, gastric mucosal blood flow (GMBF) and prostaglandin E₂ (PGE₂) were measured. The mRNA transcription of cyclooxygenase-1 (COX-1) and cyclooxygenase-2 (COX-2) were analyzed with RT-PCR and protein expression with Western blot. Results: The gastric juice volume was significantly increased in aspirin group compared with those of fasting or saline control groups (P<0.01); while the pH, mucus, GMBF and PGE₂ were significantly decreased in aspirin treated rats compared with those of other two groups (P<0.01). COX-2, evaluated with mRNA and protein expression, was significantly augmented in aspirin group compared with others. The quality of ulcer healing (QOUH) in Aspirin group was poorer than that of fasting or saline control groups. Conclusions: Aspirin enhance the recurrence of gastric ulcer. The inhibition of cycloxygenase, mucus secretion and mucosal blood flow may be involved. Aspirin also impair the quality of ulcer healing.

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