公开(公告)号：US20030222997A1

公开(公告)日：2003-12-04

申请号：US10446849

申请日：2003-05-29

Applicant: PENTAX Corporation

Inventor： Kohei Iketani

IPC: H04N005/20

CPC classification number: H04N5/243 ,  A61B1/045 ,  H04N5/20 ,  H04N5/202 ,  H04N17/002 ,  H04N2005/2255

Abstract: An automatic gain control device for an electronic endoscope is provided and comprises a controllable gain amplifier, an A/D converter, a histogram circuit, and a CPU. The controllable gain amplifier amplifies image signals from an imaging device. Amplified image signals from the controllable gain amplifier are input to the A/D converter. A histogram of the amplified image signals from the controllable gain amplifier is produced by the histogram circuit when an image taken in a white-balance test accessory is taken. By using the CPU, the gain of the controllable gain amplifier is adjusted in accordance with the determination of whether a saturated pixel exists for signals in the tolerance range of the A/D converter, so that a linear region of the image signals from the controllable gain amplifier substantially coincides with the tolerance range.

Abstract translation: 提供了一种用于电子内窥镜的自动增益控制装置，包括可控增益放大器，A / D转换器，直方图电路和CPU。 可控增益放大器放大来自成像装置的图像信号。 来自可控增益放大器的放大图像信号被输入到A / D转换器。 当采用白平衡测试附件中拍摄的图像时，直方图电路产生来自可控增益放大器的放大图像信号的直方图。 通过使用CPU，根据对A / D转换器的公差范围内的信号是否存在饱和像素的确定来调整可控增益放大器的增益，使得来自可控制的图像信号的线性区域 增益放大器基本上与公差范围一致。

公开(公告)号：US20030179291A1

公开(公告)日：2003-09-25

申请号：US10390648

申请日：2003-03-19

Applicant: PENTAX Corporation

Inventor： Hiroyuki Kobayashi ,  Kohei Iketani

IPC: H04N007/18

CPC classification number: A61B1/00059 ,  A61B1/045

Abstract: An electronic endoscope apparatus is provided that comprises an image-pickup device, an objective optical system, a compensation information storing memory, a mask data storing memory, and an electronic mask compensation processor. The objective optical system forms a subject image on an imaging surface of the image-pickup device. The compensation information storing memory stores compensation information which relates to a misalignment between an in-focus area produced by the objective optical system on the imaging surface, and an effective image sensing area of the image-pickup device. The mask data storing memory stores mask data for an electronic mask operation. The electronic mask compensation processor translates an electronic mask area in accordance with the compensation information.

Abstract translation: 提供了一种电子内窥镜装置，其包括图像拾取装置，物镜光学系统，补偿信息存储存储器，掩模数据存储存储器和电子掩模补偿处理器。 物镜光学系统在图像拾取装置的成像表面上形成被摄体图像。 补偿信息存储存储器存储与成像表面上的物镜光学系统产生的对焦区域和图像拾取装置的有效图像感测区域之间的未对准相关的补偿信息。 掩模数据存储存储器存储用于电子掩模操作的掩模数据。 电子掩模补偿处理器根据补偿信息转换电子掩模区域。