As to sea image, the variance feature of region of interest and the luminance contrast feature between target and background are used to fusion recognition.

对于海面图像，分别采用感兴趣舰船目标区域的方差值、目标和背景亮度对比度这两个特征对目标进行融合识别。

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The operating range for extended target is calculated by considering of the target finding ability of eyes, contrast of target luminance, discrimination level and detection probability.

并综合考虑人眼的目标发现能力、目标的亮度对比度、观察等级和探测概率的要求，计算出面源目标的作用距离。

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There are interactions in the effects of VDT luminance contrast and screen luminance on operator's visual performance.

VDT的亮度对比度和屏面亮度在对操作者视觉功能的影响中，存在着交互作用。

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