本文選題：計(jì)算機(jī)斷層成像 + 幾何尺寸測(cè)量��； 參考：《光子學(xué)報(bào)》2017年01期

【摘要】：針對(duì)變電流投影融合中的閾值選擇問(wèn)題,提出了一種基于動(dòng)態(tài)時(shí)間彎曲的變電流投影融合方法.該方法首先計(jì)算不同電流下投影的灰度值-有效邊緣梯度序列,然后利用動(dòng)態(tài)時(shí)間彎曲距離對(duì)預(yù)處理后的序列進(jìn)行相似匹配,自動(dòng)判斷最佳融合閾值,最后根據(jù)閾值確定不同電流投影的子區(qū)域并對(duì)其進(jìn)行融合,實(shí)現(xiàn)了探測(cè)器動(dòng)態(tài)范圍的擴(kuò)展.本文方法計(jì)算的各角度下融合閾值的平均誤差僅為2.26%,能夠避免人工選擇融合閾值的主觀性,基于融合后重建圖像的信噪比與幾何尺寸測(cè)量準(zhǔn)確度均優(yōu)于固定融合閾值的方法.
[Abstract]:To solve the problem of threshold selection in variable current projection fusion, a method of variable current projection fusion based on dynamic time bending is proposed. The method first calculates the gray value of the projection under different currents-the effective edge gradient sequence, then uses the dynamic time bending distance to match the pretreated sequence, and automatically judges the best fusion threshold. Finally, the sub-regions of different current projection are determined and fused according to the threshold value, and the dynamic range of the detector is extended. The average error of fusion threshold calculated by this method is only 2.26, which can avoid the subjectivity of artificial selection of fusion threshold. The SNR and geometric dimension measurement accuracy of reconstructed image based on fusion is better than that of fixed fusion threshold.
【作者單位】： 國(guó)家數(shù)字交換系統(tǒng)工程技術(shù)研究中心;中國(guó)人民解放軍95807部隊(duì);
【基金】：國(guó)家自然科學(xué)基金(Nos.61372172,61601518)資助~~
【分類號(hào)】：O434.1

【相似文獻(xiàn)】

相關(guān)期刊論文 前6條

1 陳平生;;基于動(dòng)態(tài)時(shí)間規(guī)整的酒駕識(shí)別研究[J];紹興文理學(xué)院學(xué)報(bào)(自然科學(xué));2013年02期

2 馬明，張?jiān)�，王建宇，黃志同;語(yǔ)音識(shí)別中的動(dòng)態(tài)時(shí)間規(guī)正和隱馬爾可夫模型等價(jià)性研究[J];鄭州大學(xué)學(xué)報(bào)(自然科學(xué)版);1996年02期

3 薛R，

本文編號(hào)：1884047