直接體繪制中增強(qiáng)深度感知的網(wǎng)格投影算法
doi: 10.11999/JEIT150303 cstr: 32379.14.JEIT150303
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1.
(裝備學(xué)院研究生管理大隊(duì) 北京 101416) ②(裝備學(xué)院復(fù)雜電子系統(tǒng)仿真實(shí)驗(yàn)室 北京 101416)
基金項(xiàng)目:
國(guó)家自然科學(xué)基金(61202129)
Enhanced Depth Perception Grid-projection Algorithm for Direct Volume Rendering
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1.
(Department of Graduate Management, Equipment Academy, Beijing 101416, China)
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2.
(Science and Technology on Complex Electronic System Simulation Laboratory, Equipment Academy, Beijing 101416, China)
Funds:
The National Natural Science Foundation of China (61202129)
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摘要: 體繪制技術(shù)生成的圖像中丟失了深度信息，已有的增強(qiáng)深度感知方法通常只針對(duì)某些結(jié)構(gòu)區(qū)域，犧牲其它結(jié)構(gòu)信息的同時(shí)又直接修改體繪制算法。面向光線投射體繪制算法，該文提出一種增強(qiáng)深度感知的方法，不直接修改光線投射算法。投影均勻網(wǎng)格到體數(shù)據(jù)表面，網(wǎng)格跟隨表面變形后經(jīng)光線投射繪制在結(jié)果圖像中，用戶根據(jù)變形網(wǎng)格能夠感知圖像中的深度信息。同時(shí)，為突顯變形網(wǎng)格所反映的深度信息，對(duì)投影后的網(wǎng)格線進(jìn)行深度相關(guān)的著色，并添加投影輔助線以連接不同深度表面上的投影網(wǎng)格。算法在統(tǒng)一計(jì)算設(shè)備架構(gòu)下并行執(zhí)行后，不僅能夠?qū)崟r(shí)生成圖像支持用戶的交互控制，且圖像中增強(qiáng)深度感知的效果明顯，特別是當(dāng)體數(shù)據(jù)包含多個(gè)分離或者交叉物體時(shí)。
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關(guān)鍵詞:
- 體繪制 /
- 深度感知 /
- 網(wǎng)格投影 /
- 并行執(zhí)行 /
- 統(tǒng)一計(jì)算設(shè)備架構(gòu)
Abstract: The depth information in volume data is lost in the image rendered by volume rendering technique. The existing methods of depth perception enhancement only enhance some structures in the volume data at the cost of other structures details, and they directly edit the volume rendering algorithm. For ray-casting algorithm, a method of depth perception enhancement is presented, and it does not directly edit the algorithm. Specifically, an inerratic grid is projected to the surface of volume data, and then the grid changing along surface is rendered in the final image. Users can apperceive the depth information of surface from the changed grid. Meanwhil, two methods are used to enhance the depth information of the grid projection lines, one is coloring the grid lines based on the depth, and the other one is adding accessorial lines to join the grid lines on two surfaces with different depths. When implemented using compute unified device architecture, the image is rendered in real-time under user interaction. The effect of depth perception enhancement in the final image is obvious especially when the volume data contains some disjunct or intersectant objects. -
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