测控技术杂志社,测控在线—一种序列虹膜型图像的质量评价方法 关键词：图像质量;虹膜图像;灰度梯度;应变图 [gap=598]Key words：image qualiy;iris image;gray scale gradient;stress image
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, and can be applied to evaluation of defocusing and motion blurring. The vector norm sum of gray gradient is the best among them.
它们都有无偏性好、单峰性强、灵敏度高等特点,可用于离焦模糊和运动模糊情况的评价,且灰度梯度向量模方和最理想。
参考来源 - 基于灰度梯度的数字图像评价函数·2,447,543篇论文数据，部分数据来源于NoteExpress
提出了结合图像灰度梯度信息和彩色直方图信息的人头识别算法。
An algorithm that integrates gray scale gradient cue and color histogram cue to detect the human head is proposed.
提出了一种数码相机拍摄的文本图像的二值化方法，该方法是全局阈值、局部阈值与灰度梯度方法的结合。
A binarization method for digital camerabased document image was proposed. The method is a combination of the global thresholding, local thresholding and the gray gradient method.
但由于在合成孔径雷达图像中存在严重的相干斑噪声，有人认为使用灰度梯度提取合成孔径雷达图像的灰度边界得不到好的结果。
Because the serious noise of coherent speckle exists in the SAR imagery, some people believe that edge extraction using gradient for SAR imagery gives poor results.
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