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    Apparatus and method for increasing the scan accuracy and quality of the flatbed scanner by using close loop control
    81.
    发明授权
    Apparatus and method for increasing the scan accuracy and quality of the flatbed scanner by using close loop control 失效
    通过使用闭环控制来增加平板扫描仪的扫描精度和质量的装置和方法

    公开(公告)号：US06178015B1

    公开(公告)日：2001-01-23

    申请号：US09092263

    申请日：1998-06-05

    Applicant: Wayne Lee ,  Jenn-Tsair Tsai

    Inventor： Wayne Lee ,  Jenn-Tsair Tsai

    IPC: H04N104

    CPC classification number: H04N1/0473 ,  H04N1/1013 ,  H04N1/193 ,  H04N2201/02439 ,  H04N2201/04705 ,  H04N2201/0472 ,  H04N2201/04727 ,  H04N2201/04734 ,  H04N2201/04755 ,  H04N2201/04794

    Abstract: An optical ruler is provided on the back surface side of the top housing and close to the transparent window along a scanning direction for providing a calibration reference. The optical ruler is formed with black and white blocks alternately arranged in an array. An image sensor which has a width larger than the width of the transparent window is provided for reading the image information of the optical ruler along with a scanned sheet while being progressively driven by a step motor. A determining element computes the actual moving steps of the step motor by calculating the number of black and white pixels from the scanned image of the optical ruler. When the actual moving steps of the step motor are fewer than a predetermined threshold value, or when the frequency of the occurrences of the scan line losses is higher than a predetermined threshold value, the image sensor is driven by the step motor to scan the sheet again. As a result, the step motor can be operated in response to a closed loop control signal depending on the actual moving steps of the step motor.

    Abstract translation: 光学尺被设置在顶部壳体的背面侧并沿着扫描方向靠近透明窗口，以提供校准基准。 光学标尺形成有交替排列成阵列的黑白块。 提供宽度大于透明窗口宽度的图像传感器，用于通过步进电机逐步驱动来读取光学标尺的图像信息以及扫描的片材。 确定元件通过从光学标尺的扫描图像计算黑白像素的数量来计算步进电机的实际移动步长。 当步进电动机的实际移动步骤小于预定阈值时，或者当扫描线损耗的频率高于预定阈值时，图像传感器由步进电机驱动以扫描片材 再次。 结果，可以根据步进电动机的实际移动步骤响应于闭环控制信号来操作步进电动机。

    Image reading apparatus
    83.
    发明公开
    Image reading apparatus 审中-公开
    图像读取设备

    公开(公告)号：EP2012520A1

    公开(公告)日：2009-01-07

    申请号：EP08011870.6

    申请日：2008-07-01

    Applicant: Seiko Epson Corporation

    Inventor： Tamai, Kensuke ,  Nakayama, Yosuke

    IPC: H04N1/047

    CPC classification number: H04N1/0473 ,  H04N1/00819 ,  H04N1/1013 ,  H04N2201/0081 ,  H04N2201/0448 ,  H04N2201/04708 ,  H04N2201/04718 ,  H04N2201/0472 ,  H04N2201/04731

    Abstract: An image reading apparatus includes a reading unit, a control unit, and a pattern region. The reading unit moves a linear reading range, which is provided in a main scanning direction, in a sub-scanning direction that intersects with the main scanning direction while reading an object that faces the reading range, and generates image data on the basis of a read result. The control unit controls the reading unit. The pattern region includes a predetermined pattern that defines a reference position for specifying a reading position that is read by the reading unit. The predetermined pattern has a characteristic portion that specifies a schematic position of the predetermined pattern in the sub-scanning direction. The control unit includes a first image acquisition unit, a pattern searching unit, a second image acquisition unit, a characteristic portion searching unit, a first reprocessing instruction unit, and a second reprocessing instruction unit. The first image acquisition unit instructs the reading unit to perform reading and then acquires first image data. The pattern searching unit searches an image of the predetermined pattern in the first image data. The second image acquisition unit, when an image of the predetermined pattern has not been detected by the pattern searching unit, instructs the reading unit to perform reading, and then acquires second image data. The characteristic portion searching unit searches an image of the characteristic portion in the second image data. The first reprocessing instruction unit, when the image of the characteristic portion has been detected by the characteristic portion searching unit, specifies a schematic position of the pattern region in the sub-scanning direction on the basis of a position of the detected image of the characteristic portion, and instructs the first image acquisition unit to perform reading again at the schematic position of the pattern region. The second reprocessing instruction unit, when the image of the predetermined pattern has not been detected again from first image data that are generated through second-time reading by the first image acquisition unit, instructs the second image acquisition unit to perform reading again at a position that does not include the position at which the image of the characteristic portion has been detected.

    Abstract translation: 图像读取设备包括读取单元，控制单元和图案区域。 读取单元在读取面向读取范围的对象的同时，在与主扫描方向相交的副扫描方向上移动沿主扫描方向设置的线性读取范围，并且基于图像数据生成图像数据 读取结果。 控制单元控制读取单元。 图案区域包括定义用于指定由读取单元读取的读取位置的基准位置的预定图案。 预定图案具有指定预定图案在副扫描方向上的示意性位置的特征部分。 控制单元包括第一图像获取单元，图案搜索单元，第二图像获取单元，特征部分搜索单元，第一再处理指令单元和第二再处理指令单元。 第一图像获取单元指示读取单元进行读取，然后获取第一图像数据。 模式搜索单元在第一图像数据中搜索预定模式的图像。 当图案搜索单元未检测到预定图案的图像时，第二图像获取单元指示读取单元进行读取，然后获取第二图像数据。 特征部分搜索单元搜索第二图像数据中的特征部分的图像。 当特征部分搜索单元已经检测到特征部分的图像时，第一再处理指示单元基于检测到的特征图像的位置来指定图案区域在副扫描方向上的示意性位置 并指示第一图像获取单元再次在图案区域的示意性位置进行读取。 第二再处理指示单元在从第一图像获取单元的第二次读取产生的第一图像数据未再次检测到预定图案的图像时指示第二图像获取单元再次在位置 不包括检测到特征部分的图像的位置。

    Initial position sensor
    86.
    发明公开
    Initial position sensor 失效
    初始位置传感器

    公开(公告)号：EP0853415A3

    公开(公告)日：1999-06-02

    申请号：EP97307279.6

    申请日：1997-09-18

    Applicant: Hewlett-Packard Company

    Inventor： Christensen, Michael L.

    IPC: H04N1/047

    CPC classification number: H04N1/0473 ,  H04N1/1017 ,  H04N1/193 ,  H04N2201/04705 ,  H04N2201/0472 ,  H04N2201/04732

    Abstract: Apparatus (10) for sensing an initial position of a moveable carriage (18) mounted within a housing (22) of an imaging device (11) may comprise a detector (62) having a plurality of light sensitive elements (17) for detecting objects within a field of view. At least one of the light sensitive elements (17) is an image sensing element (21) and at least one of the light sensitive elements (17) is a position sensing element (19). A reference mark (15) is positioned on the housing (22) so that is within the field of view (29) of the position sensing element (19) of the detector (62) when the carriage (18) is at about a home position. An image data processor (46) connected to the detector (62) and responsive to the output signals generated thereby determines whether the reference mark (15) is within the field of view (29) of the position sensing element (19) of the detector (62).

    An image reading method and apparatus therefor
    88.
    发明公开
    An image reading method and apparatus therefor 失效
    Bildleseverfahren und-gerät。

    公开(公告)号：EP0452933A2

    公开(公告)日：1991-10-23

    申请号：EP91106235.4

    申请日：1991-04-18

    Applicant: Dainippon Screen Mfg. Co., Ltd.

    Inventor： Sakamoto, Takashi, Dainippon Screen, Mfg.Co.,Ltd.

    IPC: H04N1/04

    CPC classification number: H04N1/053 ,  H04N1/1008 ,  H04N1/193 ,  H04N2201/02443 ,  H04N2201/04703 ,  H04N2201/0472 ,  H04N2201/04734 ,  H04N2201/04787 ,  H04N2201/04793 ,  H04N2201/04798

    Abstract: The present invention relates to an image reading method and apparatus therefor where CCDs and similar devices are utilized, especially when making adjustments to compensate for read-out position errors. The apparatus for reading images includes a circuit for appointing an adjusted read-out address in order to get the goal image signals. In the circuit, the adjusted read-out address is obtained by using the actual data derived from scanning the sample chart 30 with an image device, and the computed data which is the same data that is obtained if the sample chart 30 is scanned with an ideal optical system, the sample chart 30 on which black lines are described at regular intervals. Accordingly, the present invention makes available an apparatus for reading images that will be cheap and easy to arrange, and yet print or reproduce the original image without distortion, color error or the like occurring.

    Abstract translation: 本发明涉及一种使用CCD和类似装置的图像读取方法及其装置，特别是在进行调整以补偿读出位置误差时。 用于读取图像的装置包括用于指定调整的读出地址以获得目标图像信号的电路。 在该电路中，通过使用从图像装置扫描样本图表30得到的实际数据获得调整后的读出地址，并且计算出的数据是与样本图表30扫描获得的数据相同的数据 理想的光学系统，以规则的间隔描绘黑线的样品图30。 因此，本发明提供了一种用于读取图像的装置，该装置便宜且易于布置，并且仍然打印或再现原始图像而不发生变形，颜色错误等。

    Document scanning apparatus
    90.
    发明公开
    Document scanning apparatus 失效
    文件扫描装置

    公开(公告)号：EP0227925A3

    公开(公告)日：1987-11-11

    申请号：EP86115610

    申请日：1986-11-11

    Applicant: International Business Machines Corporation

    Inventor： Asada, Shigeki ,  Hasegawa, Megumi

    IPC: H04N01/028

    CPC classification number: H04N1/403 ,  H04N1/0473 ,  H04N1/1008 ,  H04N1/1017 ,  H04N1/193 ,  H04N2201/04703 ,  H04N2201/0472 ,  H04N2201/04732

    Abstract: A reference position marker (9) on a document support table (3) is positioned within the field of view of a CCD sensor array (8) which senses an image of a document (10) placed on the table. To distinguish the reference position marker (9) from the document image, the marker has a high reflectance surface and a round cross section to directly reflect light from a lamp (4) into the CCD sensor array (8) to cause the array to operate in a saturated range to generate a higher output signal than the highest signal expected during the document scanning operation. A control unit (30) sets a threshold of a comparator circuit (33) to a level which is exceeded by the higher output signal in the marker recognition operation and not exceeded by the highest signal generated during the document scanning operation. The threshold level is switched by the control unit after the marker (9) is detected to a level for producing bi-level signals representing the image of the document.

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