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live_wire算法中局部代價(jià)計(jì)算的加速改進(jìn)

Acceleration of local cost computation in live wire algorithm

作者: 宋威  李兵  沈君姝 
單位:江蘇省中醫(yī)院放療科(南京210029)
關(guān)鍵詞: 圖像分割;代價(jià)函數(shù);加速算法;live  wire算法 
分類號(hào):
出版年·卷·期(頁(yè)碼):2013·32·6(565-570)
摘要:

目的 加快live wire 算法中局部代價(jià)權(quán)值的計(jì)算速度,提升算法的運(yùn)行效率。方法 提出利用計(jì)算相

關(guān)性同步計(jì)算相鄰節(jié)點(diǎn)的梯度方向權(quán)值代價(jià)分量fD,以及只計(jì)算最短路徑搜索中已排序節(jié)點(diǎn)相對(duì)于鄰域節(jié)點(diǎn)

的權(quán)值代價(jià)兩種方法改進(jìn)局部代價(jià)算法。結(jié)果 改進(jìn)算法對(duì)于不同圖像空間分辨率的情況,代價(jià)權(quán)值的計(jì)算

量,live wire算法的運(yùn)行時(shí)間以及交互分割時(shí)間上,相比較其他兩種算法都有一定程度的減少。結(jié)論 改進(jìn)

代價(jià)計(jì)算方式的live wire算法,能夠正確分割目標(biāo)圖像,在高圖像分辨率的情況下明顯提高了交互分割速

度。

Objective To accelerate local cost computation in live wire algorithm. Methods Two

methods were proposed to improve the efficiency of local cost computation including

synchronously calculating fD local cost components between the neighboring pixels using

correlation information and only calculating local costs of the processed pixels in the

optimal path searching. Results Compared with two other algorithms,the improved algorithm had

less workload of local cost computation,less running time and interactive segmentation time

for different image resolutions. Conclusions Improved algorithm of local cost computation

accelerated the speed of interactive segmentation of live wire algorithm especially in high

image resolution.

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