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我正在尝试使用 OpenCV 找到图像中的主要频率。我在 OpenCV 教程中看到了 dft 示例,但是如何找到具有周期性结构的图像的主要频率?我想提取最低谐波的光谱信息,将它们复制到新图像并进行反向 dft。此问题附有示例图像。