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发明公开
CN108089416A 移动量检测装置、图像形成装置和移动量检测方法 失效 - 放弃专利权

移动量检测装置、图像形成装置和移动量检测方法
摘要：
移动量检测装置包括：通过对于第N图像数据和第N+1图像数据进行离散傅里叶变换，生成第N频率空间数据和第N+1频率空间数据的离散傅里叶变换部；用于获取纸张的目标速度，基于获取的目标速度和图像传感器中的曝光时间，决定截止值的截止值决定部；以及用于基于低于截止值的频率分量中的、第N频率空间数据和第N+1频率空间数据的相位差，计算纸张的移动量的移动量计算部。
摘要（英）：

A movement amount detecting device includes a discrete Fourier transform unit performing discrete Fourier transform on N-th image data and (N+1)th image data, thereby generating N-th frequency space data and (N+1)th frequency space data; a cutoff value determining unit used for acquiring a target speed of a sheet and determining a cutoff value based on the obtained target speed and exposure time in an image sensor; and a movement amount calculating unit used for calculating an amount of movement of the sheet based on a phase difference between the N-th frequency space data and the (N+1)th frequency space data in a frequency component smaller than the cutoff value.

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