公开(公告)号：US20040252381A1

公开(公告)日：2004-12-16

申请号：US10825209

申请日：2004-04-16

申请人： NEC VIEWTECHNOLOGY, LTD.

发明人： Satoru Takagi

IPC分类号： G02B027/14 ,  G02B015/14

CPC分类号： G02B15/14

摘要： A documentation camera is capable of correcting a trapezoidal distortion and also adjusting the central position of a displayed image of a document when the image is zoomed in at the time the image is captured obliquely to the document. The zooming magnification of a zoom lens in a lens unit is detected by a zooming magnification detector, and a CPU searches a ROM based on the detected zooming magnification to read, from the ROM, parameters required in a trapezoidal distortion correcting process and also parameters required to adjust the central position of the displayed image. The CPU transmits the former parameters to a trapezoidal distortion correcting circuit to perform the trapezoidal distortion correcting process and also transmits the latter parameters to a shifting circuit to adjust the central position of the displayed image.

摘要翻译： 文档照相机能够校正梯形失真，并且当图像被倾斜地收录到文档时，当图像被放大时，还可以调整文档的显示图像的中心位置。 透镜单元中的变焦透镜的变焦倍率由变焦倍率检测器检测，CPU根据检测到的变焦倍率来检索ROM，从ROM读取梯形失真校正处理中所需的参数，并且还需要参数 调整显示图像的中心位置。 CPU将先前的参数发送到梯形失真校正电路以执行梯形失真校正处理，并且将后面的参数发送到移位电路以调整显示图像的中心位置。