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have to wait for the big economic boom to invigorate the art market.‖ Even so, the hot pursuit of some special items appeared this spring. A special session of China Guardian Spring Auctions titled ―Fine Gilt—Bronze Buddhist Images‖ achieved a great deal with total sales volume of million yuan and 92 percent sale rate. The 5th Shamar Rinpoche Statue from 1617th century of Tibet was sold for million yuan. The Beijing Chengxuan Auctions featured almost 2,800 items of coins and stamps in three sessions with good sale rate. The Huachen Auctions also set a special session of photographs under the condition of largescale decline of auction sessions. There was a palpable dull thud of disappointment that acpanied the return of the imperial entourage of Zhen Huan to her homeland. It followed a couple years of hushed excitement as Chinese fans were fed tidbits about their proud concubine who was supposed to conquer the high ground of the North American market. Zhen Huan is, of course, the title character of The Legend of Zhen Huan, a 2021 television series that swept China off its feet and later took other Asian countries by storm. Two years ago, it was reported that HBO, a premium cable service headquartered in the United States, was going to air it in North America after some modification. Now, a condensed version that provides English subtitles but no dubbing has finally been made available on Netflix for online streaming. This version, highly anticipated as a milestone in China39。image(xx)。woman39。) %圖像融合 figure(3)。,2)。mat39。 d1=wrcoef2(39。,c,s,1)。 whos(39。)。,2,thr,sorh,keepapp)。image(wcodemat(Xnoise,192))。這 一技術(shù)可應(yīng)用于多頻譜圖像理解以及醫(yī)學(xué)圖像處理等領(lǐng)域。實(shí)驗(yàn)表明這種取 門 限的方式有時(shí)并不太令人滿意。 則 )],([),( yxEgyxf ? 式中 x, y 為像平面中點(diǎn)的坐標(biāo)。 定義:設(shè) )()( 2 RLt ?? ,其傅立葉變換為 )(??? ,當(dāng) )(? ?? 滿足允許條件(完全重構(gòu)條件或恒等分辨條件) ??RdC ????? 2)(? ? 時(shí),我們稱 )(t? 為一個(gè)基本小波或母小波。 基于 小波變換的 數(shù)字 圖像處理 摘 要: 本文先介紹了小波分析的 基本理論, 為 圖像處理 模型的構(gòu)建奠定了基礎(chǔ), 在此基礎(chǔ)上提出了小波分析在 圖像壓縮,圖像去噪,圖像融合, 圖像增強(qiáng) 等圖像處理方面的應(yīng)用 ,最后在 MATLAB 環(huán)境下 進(jìn)行仿真,驗(yàn)證了小波變化在圖像處理方面的優(yōu)勢(shì)。 小波及小波變換 小波的核心作用是用小波及其伸縮和平移來表示 函數(shù)和信號(hào),不但具有局部化時(shí)頻分析能力,而且時(shí)間分辨率和頻率分辨率均可以調(diào)整。適當(dāng)選取坐標(biāo)系使取圖平面垂直于 z 軸,設(shè)截距為 Z0,圖像可看作只 是記錄在平面 z=z0上 的能量分布 [2], 實(shí)際中這種物質(zhì)能量的記錄值往往用亮度值表示。 閾值函數(shù)主要可以分為如下三種: 硬閾值函數(shù) 它假定幅值大于 門限 T的小波系數(shù)都是由信號(hào)貢獻(xiàn)的,而小于門限 T的小波系數(shù) 來至于噪聲。 ⑷ 圖像融合 圖像融合 是將同一對(duì)象的兩個(gè) 或更多的圖像合成在一幅圖像中,以便它比原來的任何一幅圖像更容易 為人們所理解。) subplot(2,2,2)。sym539。db339。)。d39。,1)。 ca1=wcodemat(ca1,440,39。39。ca239。 title(39。 %畫出融合后的圖像 subplot(223)。s president, who is also a renowned tenor, tells China Daily. During a tour in 1985, he went to a village and met an elderly local man, who told him a story about his friendship with a solider from Shenyang, capital of Northeast China39。 names and figuring out what to do with them for the brief time each week that I stand in front of them. I do not consider the challenges of learning to live here part of a purposeful life. I consider those issues existential in nature. One of the problems with my life in America was that I felt it had no purpose. I went to work every day and even did what I could to make my colleagues39。t just about sharing art with nomadic families but also about gaining inspiration for the music and dance. Ulan Muqir literally translates as red burgeon, and today39。 %減小圖像亮度 c=*c。map1=map。 disp(39。)。)。 v1=wrcoef2(39。 cv1=detcoef2(39。原始圖像 39。 %對(duì)低頻系數(shù)進(jìn)行放大處理,并抑制高頻系數(shù) for i=1:csize(2)。,Xnoise)。 subplot(2,2,1)。 ⑶圖形增強(qiáng) 圖像增強(qiáng)問題主要通過時(shí)域和頻域處理兩種方法來解決。 小波分析在圖像處理中的應(yīng)用 小波分析在圖像處理中的應(yīng)用主要表現(xiàn)在以下幾個(gè)方面: ⑴ 圖像去噪 噪聲的產(chǎn)生是一個(gè)隨機(jī)過程,噪聲分量灰度值是一個(gè)隨即變量,其統(tǒng)計(jì)特性 由概率密度函數(shù)表征, 白噪聲、高斯噪聲、泊松噪聲是三種形式常見的重要噪聲 ; 設(shè)長度為 N 的信號(hào) fn被噪聲 en所污染,所測(cè)得的含噪數(shù)據(jù)為: nn efX ??n 去噪的目標(biāo)是從含噪數(shù)據(jù) X得到信號(hào) x 的一個(gè)逼近 信號(hào) x’ ,使得在某種誤差準(zhǔn)則估計(jì)下 x’ 是 x 的最佳逼近。但 ??kh 的傳遞函數(shù)的模的平方有顯式表達(dá)式。 1986 年 Meyer 和 Lemarie提出了多尺度分析的思想。 小波分析,作為一種新的數(shù)學(xué)分析工具,是 泛函分析、傅立葉分析、樣條分析、調(diào)和分析以及數(shù)值分析理論的完美結(jié)合,所以小波分析具有良好性質(zhì)和實(shí)際應(yīng)用 背景,被廣泛應(yīng)用于計(jì)算機(jī)視覺、圖像處理以及目 標(biāo)檢測(cè)等領(lǐng)域,并在理論和方法上取 得了重大進(jìn)展 ,小 波分析在圖 像處理及其相關(guān)領(lǐng)域所發(fā)揮的作用也越來越大。 對(duì)于任意的函數(shù))()( 2 RLtf ? 的連續(xù)小波變換為 dta bttfafbaWRbaf)()(,),( 2/1, ????? ?? ?? 其重構(gòu)公式(逆變換)為 ? ????????? dad ba btbaWaCtf f )(),(11)( 2 ?? 把連續(xù)小波變換中的尺度參數(shù) a和平移參數(shù) b進(jìn)行離散化: jaa 0? , 00bkab j? ,其中 Zj? ,為了方便起見,總是假設(shè) a00,則得到離散小波函數(shù) )()()(002/00 002/0, kbtaaa bkatat jjjjjkj ???? ??? ??? 相應(yīng)的離散小波變換 dtkbtatfatfbaW jRabaf )()()(,),( 002/0, ????? ?? ? ?? 其重構(gòu)公式為 )(,)()()()(,),( , ,002/0, tftdt fkbtatfatfbaW baZba baaRabaf ???? ?? ??? ???????? 由于基小波 )(t? 生成的小波 )(, tba? 在小波變換中對(duì)被分析的信號(hào)起著觀測(cè)窗的作用,所以 )(t? 還應(yīng)該滿足一般函數(shù)的約束條件 ???? dtt)(?〈 ? 故 )(??? 是一個(gè)連續(xù)函數(shù)。 由于 f 的值是能量的記錄,故其?,2,1,0)}()({)2( 22 ???????? ????? ?? lntbntalt n nlnl ???nnnn hbga ?? ?? 2121 ::)12()2()( ??? ttt ???011, 1pp??,)1( 1???? nnn pq 011, 1qq? ??)12()2()( ??? ttt ???? ?1( 2 ) ( ) ( )2t t t? ? ??? ? ?1( 2 1) ( ) ( )2t t t? ? ?? ?