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應用於取樣結構轉換及濾波器組之多維FIR數位濾波器之設計 = esign...

國立高雄大學電機工程學系碩士班

應用於取樣結構轉換及濾波器組之多維FIR數位濾波器之設計 = esign of multidimensional FIR digital filters for sampling structure conversion and filter banks

紀錄類型:	書目-語言資料,印刷品 : 單行本
並列題名:	esign of multidimensional FIR digital filters for sampling structure conversion and filter banks
作者:	黃耀興,
其他團體作者:	國立高雄大學
出版地:	[高雄市]
出版者:	撰者;
出版年:	2012[民101]
面頁冊數:	56面圖，表 : 30公分;
標題:	數位濾波器
標題:	FIR Filter
電子資源:	http://handle.ncl.edu.tw/11296/ndltd/62569587049374326616
附註:	參考書目：面52-56
摘要註:	不同週期取樣結構之間的轉換是一個重要的問題，其中以常用於電視影像處理及超高解析度電視(HDTV)等應用使用之六角形(Quincunx)取樣結構和矩形(Rectangular)取樣結構之間的轉換尤為重要。在本篇論文中，為了避免轉換過程中所發生的重疊混淆 (Aliasing error)以及除去重覆的影像，原始圖像的重新取樣及結構轉換，使用適當的降頻濾波器(Decimation filter)及插值濾波器(Interpolation filter) ，並採用有效的特徵向量來設計這種濾波器。透過最小化的通帶和禁帶的二次誤差的條件，設計一個菱形的取樣結構轉換特徵數位濾波器，常見於使用時間和頻域的限制，本文設計此種取樣轉換濾波器並且導入設計和模擬相關影像處理，以證明本方法的有效性。本篇論文最後討論雙通道濾波器組(Filter bank)，這些多重取樣率的系統能夠用在許多的領域上，例如影像編碼、語音處理以及視訊壓縮。本文以採用具權重式最小平方差逼近法（(Weighted least-squares approach），設計了包含二維及三維最佳化之數位濾波器。這個方法可以有效的設計正交鏡像濾波器組(QMF banks)，以進一步降低整體振幅響應的峰值誤差。與完美重建正交鏡像濾波器組相比，只需根據欲追求的失真幅度進行設計一組濾波器，即可有效降低濾波器的成本及失真的幅度，可有效的減少系統的複雜性。最後依本方法舉例包括二維及三維數位濾波器組之設計，證明本方法的有效性。 The conversion between different periodic sampling standards is an important problem, especially for the conversion between quincunx and rectangular structures in television image processing and HDTV applications. For rcconstructing the original picture accurately, minimizing a quadratic measure of the error in the passband and stopband, a two-dimensional diamond-shaped FIR eigenfilter is designed for sampling-structure conversion. Time- and frequency-domain constraints are easily incorporated into this method, such that the design difficulty inherent to sampling-conversion filters can be effectivly solved. Finally this thesis concludes with design of filter banks. It is well known that the multirate systems can be used in many fields, such as video encoding, audio processing and video compression. In this thesis, two- and three-dimensional digital filters are designed by using the weighted least-squares (WLS) approach. The method can be generalized such that multidimensional QMF banks can be designed by the proposed to further reduce the peak error of overall magnitude response. Comparing with the existing works concern the design of perfect-reconstuction QMF bank, only of the filters is needed to be designed under the cost of magnitude distortion, but the system complexity can be reduced drastically. Several examples, including design of 2-D and 3-D QMF bank, will be presented to demonstrate the effectiveness of the proposed method.Keywords: FIR Filter、Weighted Least-Squares Approach、Two-Dimensional Digital Filter、Three-Dimensional Digital Filter、Multirate System、Filter Banks、Sampling Structure Conversion.

應用於取樣結構轉換及濾波器組之多維FIR數位濾波器之設計 = esign of multidimensional FIR digital filters for sampling structure conversion and filter banks
黃, 耀興

應用於取樣結構轉換及濾波器組之多維FIR數位濾波器之設計 = esign of multidimensional FIR digital filters for sampling structure conversion and filter banks / 黃耀興撰 - [高雄市] : 撰者, 2012[民101]. - 56面 ; 圖，表 ; 30公分.
參考書目：面52-56.
數位濾波器FIR Filter

應用於取樣結構轉換及濾波器組之多維FIR數位濾波器之設計 = esign of multidimensional FIR digital filters for sampling structure conversion and filter banks
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