The tracking and detection of tiny aerial target in real-time image sequence are based on contrast tracking algorithm.

实时图像序列空中微小目标的检测和跟踪，采用基于对比度跟踪算法。

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By contrast, the average expenses of index-tracking mutual funds were 78 basis points, and actively managed funds had expenses almost twice as high.

与之相比，指数型共同基金的平均费用率是78个基点，而主动型基金的费用几乎是ETF的两倍。

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The target detection reduces the noise, enhances the image's contrast, and extrudes the target from background through making sure of tracking region and dividing target.

其目标检测通过确定跟踪区域、分割目标等步骤先减少噪声影响，使图像对比度增强，把目标从背景中突显出来。

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By contrast, Gartner and IDC, who are better-known for tracking the PC market (and presumably thus more conservative in their methodology), do not (yet) count iPads as PCs.

FORBES: Five Reasons Why Tablets Like the iPad Are PCs

By contrast, the sharing of data among European astronomers who took part in the tracking of the 1680 comet looks surprisingly modern.

BBC: A Point of View: Crowd-sourcing comets

In contrast, high-income countries in Europe and the U.S., where population tracking is more reliable, grew relatively slowly.

FORBES: The World's Fastest-Growing Megacities