In the fourth chapter the analysis for the visual features, the adaptive clustering and the extraction of the image area with the image similar visual brightness are analyzed.

第四章分析了图像视觉特征的邻域矩特征描述，并对邻域矩特征进行自适应聚类提取边界和图像目标的视同灰度的提取。

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These channels encode data about an object's size, clarity, brightness and location in the visual field.

这些信息通道将被视物的尺寸、清晰度、亮度和视野中的位置等信息进行编码。

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By analyzing the characteristics of the brightness and contrast characteristic of the human visual system, an adaptive visible watermarking algorithm based on DCT was proposed in this paper.

分析人类视觉系统的亮度和对比度特性，提出了一种DCT域自适应可见水印算法。

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Seventy French university students were recruited for the study and told they would be participating in a three-day experiment testing the effects of brightness of video games on visual perception.

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