Based on the gradient histogram, the double thresholds can be found. At last, non-maximum suppression based on double thresholds is used to detect the edge.
通过基于梯度直方图来选取双阈值，最后进行基于双阈值的非极大值抑制，得到边缘检测的图像。
Besides, the CR users with high SNR will send assistant information to the ones with low SNR in order to help them complete the local spectrum sensing by double adaptive thresholds energy detection.
此外，信噪比(SNR)高的认知用户，向信噪比低的认知用户发送辅助信息，以帮助它们利用自适应双门限法更加准确地完成本地频谱检测。
Besides, the CR users with high SNR will send assistant information to the ones with low SNR in order to help them complete the local spectrum sensing by double adaptive thresholds energy detection.
此外，信噪比(SNR)高的认知用户，向信噪比低的认知用户发送辅助信息，以帮助它们利用自适应双门限法更加准确地完成本地频谱检测。
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