基于JPEG2000的遙感圖像感興趣區(qū)域編碼新算法及其VLSI設(shè)計(jì)
doi: 10.11999/JEIT150812 cstr: 32379.14.JEIT150812
基金項(xiàng)目:
國(guó)家自然科學(xué)基金(61271058)
A New Region of Interest Coding Algorithm Based on JPEG2000 for Remote Sensing Images and Its VLSI Design
Funds:
The National Natural Science Foundation of China (61271058)
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摘要: 為解決空間遙感圖像數(shù)據(jù)量及信道帶寬之間的矛盾，該文提出一種基于JPEG2000的感興趣區(qū)域(Region Of Interest, ROI)編碼算法。主流的JPEG2000 ROI編碼算法難以兼顧ROI質(zhì)量和系統(tǒng)計(jì)算量，且在低碼率編碼時(shí)有完全丟失背景的隱患。該算法通過(guò)精確控制各子帶中背景系數(shù)的精度，使ROI分配到更多碼流。并引入了人眼視覺(jué)特性，使較少的背景碼流產(chǎn)生盡量好的視覺(jué)效果。另外，根據(jù)該算法提出了針對(duì)矩形ROI的超大規(guī)模集成電路(VLSI)設(shè)計(jì)，此設(shè)計(jì)經(jīng)過(guò)簡(jiǎn)單調(diào)整，亦可適用于主流的ROI編碼算法。測(cè)試結(jié)果表明，該算法在ROI質(zhì)量和重建圖像視覺(jué)效果上均表現(xiàn)優(yōu)異，且支持任意形狀ROI編碼，兼容JPEG2000協(xié)議。該VLSI設(shè)計(jì)僅使JPEG2000系統(tǒng)運(yùn)行時(shí)間增加一個(gè)周期，具有極高的吞吐率，可滿足實(shí)時(shí)處理要求。
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關(guān)鍵詞:
- 遙感圖像 /
- 感興趣區(qū)域編碼 /
- JPEG2000 /
- 人眼視覺(jué)特性 /
- 超大規(guī)模集成電路
Abstract: To resolve the conflict between the amount of image data and the channel bandwidth, a Region Of Interest (ROI) coding method based on JPEG2000 is proposed in this paper. The mainstream methods for JPEG2000 ROI coding have a difficulty in balancing ROI quality and system computation, and have a hidden trouble in losing background completely at a low bit rate. The proposed method achieves ROI coding by precisely controlling the accuracy of background coefficients in each subband. The human visual property is introduced to obtain better visual effect with limited background codestream. Also, the Very Large Scale Integration (VLSI) design of the proposed method for the rectangle ROI is proposed. This design can be suitable for the mainstream ROI methods for JPEG2000 by some necessary adjustments. Experimental results show that the proposed method obtains an excellent performance in ROI quality and visual effect of the reconstructed images, supports arbitrary ROI shape coding, and is compatible with the standard. The VLSI design only adds one clock cycle on the coding time of JPEG2000 system, has a high throughput, and satisfies real-time applications. -
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