【1756-L55M14=IC697MDL250】
【1756-L55M14=IC697MDL250】
感興趣區(qū)域圖像編碼技術(shù)
感興趣區(qū)(Regionofinterest,ROI)圖像編碼技術(shù)是近年來數(shù)字圖像壓縮編碼領(lǐng)域的一個(gè)研究重點(diǎn).其在圖像高壓縮比下,能夠更好地保證重建圖像ROI質(zhì)量,是有效解決圖像質(zhì)量和壓縮比之間矛盾的一種重要手段。ROI編碼算法的基本原理是:對輸入的圖像進(jìn)行小波變換,根據(jù)圖像感興趣區(qū)產(chǎn)生ROI掩膜,移動(dòng)ROI掩膜內(nèi)的小波系數(shù)使其位于較高的位平面,在隨后進(jìn)行的嵌入式編碼中實(shí)現(xiàn)優(yōu)先編碼、優(yōu)先傳輸,使得解碼重建后的ROI比背景區(qū)擁有更好的質(zhì)量.但此類算法需要增加一定的位平面數(shù)量,解碼時(shí)也必須對移動(dòng)了的位平面進(jìn)行逆平移,增加了一定的復(fù)雜度.另一類ROI編碼方法是基于優(yōu)化截?cái)嗲度胧骄幋a(Embeddedblockcodingwithoptimizedtruncation,EBCOT)算法中碼塊失真計(jì)算的.其中具有代表性的是由Taubman提出的隱式ROI算法,其通過增加ROI碼塊失真度量的權(quán)重,使得編碼碼流中包含更多的ROI信息,從而提高重建圖像ROI質(zhì)量.其優(yōu)點(diǎn)在于不改變位平面的數(shù)量,不需要附加ROI形狀信息,解碼也不必進(jìn)行額外操作,復(fù)雜度低.但是,由于編碼是以碼塊為單位,某些ROI碼塊中可能包含大量背景區(qū)域的小波系數(shù),而只有少數(shù)ROI信息,因此該算法在一定程度上影響了編碼效率,在低碼率(不大于0.5bit/pixel)下,重建圖像ROI質(zhì)量相對于背景區(qū)域提高不明顯.相應(yīng)出現(xiàn)了一種處理方法,通過降低ROI碼塊中背景區(qū)域的小波系數(shù)權(quán)重,以減小這些系數(shù)對編碼的影響,使重建圖像ROI質(zhì)量明顯提高.但是,其采用的方式是一種有損操作,在較高碼率下影響了重建圖像的背景區(qū)域質(zhì)量,用ROI碼塊中感興趣區(qū)小波系數(shù)的個(gè)數(shù)在碼塊中所占的比例調(diào)節(jié)權(quán)重,取得了很好的效果。
◆ 企業(yè)名稱:廈門卡庫電氣有限公司
◆ 企業(yè)性質(zhì): 有限責(zé)任公司
◆ 主營業(yè)務(wù):DCS,PLC
◆ 經(jīng)營模式: 貿(mào)易
◆ 貿(mào)易地區(qū): 全國
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◆ 郵政編碼: 361000
主營產(chǎn)品:
@ ABB機(jī)器人備件,DCP10……
@ AB:Reliance,SLC500/1747/1746,Micrologix/1761/1763/1762/1766/1764 PLC- 5/1771/1785 ....PLC模塊
@ Schneider Modicon(施耐德*康)140CPU ……
@ GE通用電氣,IC697……
@ Siemens(西門子):西門子數(shù)控,西門子摩爾,6ES5948-3UR23 ……
@ TRICONEX―西屋....
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Heidenhain Spiralkabel Handrad HR 410/420/520 HR410 HR4
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Deckel NSV 55/56 (NSV56 NSV55 Grundig DMG Dialog 4 / Co
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Taststift Heidenhain TS 110/111/112/120?/510/511/520/52?1
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Taststift Heidenhain TS 110/111/112/120?/510/511/520/52?1
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