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    IMAGE SENSING APPARATUS
    5.
    发明专利
    IMAGE SENSING APPARATUS 未知

    公开(公告)号：GB2258967A

    公开(公告)日：1993-02-24

    申请号：GB9223270

    申请日：1992-11-06

    Applicant: CANON KK

    Inventor： YOSHIMURA KATSUJI ,  TOYAMA MASAMICHI ,  FUJIWARA AKIHIRO ,  SUDA HIROFUMI ,  YAMADA KUNIHIKO ,  KANEDA KITAHIRO ,  HOMMA HIDEO

    IPC: G01S3/786 ,  G02B7/36 ,  H04N5/232 ,  H04N5/235

    Abstract: An image sensing apparatus operating with adaptive selection of a first tracing algorithm in which an object image is traced by moving a detecting area capable of being movably set on an image sensing plane in such a manner that the luminance level difference between the inside and the outside of that area becomes maximum and a second tracing algorithm in which the object image is traced by moving the position of the detecting area in such a manner that a point at which a contrast becomes maximum comes to coincide with a central portion of the detecting are depending on the state of the image sensing plane. The threshold values for changing over between the first tracing algorithm and the second tracing algorithm are made to have a hysteresis characteristic.

    8.
    发明专利
    未知

    公开(公告)号：DE69031407D1

    公开(公告)日：1997-10-16

    申请号：DE69031407

    申请日：1990-06-08

    Applicant: CANON KK

    Inventor： TOYAMA MASAMICHI ,  FUJIWARA AKIHIRO ,  SUDA HIROFUMI ,  YAMADA KUNIHIKO ,  HIRASAWA MASAHIDE ,  KANEDA KITAHIRO

    IPC: G02B7/28 ,  H04N5/232

    Abstract: An automatic focus adjustment system comprises a focusing device which varies an image forming position; and a control circuit which is capable of setting first and second focusing modes. In the first focusing mode, the control circuit causes the focusing device to move to an in-focus point within its morning area. In the second focusing mode, the control circuit causes the focusing device to move to an in-focus point on the nearest focusing distance side. The control circuit is arranged to divide a moving range of the focusing device into a first area and a second area which is set on the nearest focusing distance side of the first area to make the focusing device movable within the first area in the first focusing mode, and to make it movable within both the first and second areas in the second focusing mode.

    IMAGE SENSING APPARATUS
    9.
    发明专利
    IMAGE SENSING APPARATUS 未知

    公开(公告)号：GB2258967B

    公开(公告)日：1993-05-12

    申请号：GB9223270

    申请日：1992-11-06

    Applicant: CANON KK

    Inventor： YOSHIMURA KATSUJI ,  TOYAMA MASAMICHI ,  FUJIWARA AKIHIRO ,  SUDA HIROFUMI ,  YAMADA KUNIHIKO ,  KANEDA KITAHIRO ,  HOMMA HIDEO

    IPC: G01S3/786 ,  G02B7/36 ,  H04N5/232 ,  H04N5/235

    Abstract: An image sensing apparatus operating with adaptive selection of a first tracing algorithm in which an object image is traced by moving a detecting area capable of being movably set on an image sensing plane in such a manner that the luminance level difference between the inside and the outside of that area becomes maximum and a second tracing algorithm in which the object image is traced by moving the position of the detecting area in such a manner that a point at which a contrast becomes maximum comes to coincide with a central portion of the detecting are depending on the state of the image sensing plane. The threshold values for changing over between the first tracing algorithm and the second tracing algorithm are made to have a hysteresis characteristic.

    Exposure control device
    10.
    发明专利
    Exposure control device 未知

    公开(公告)号：GB2219461A

    公开(公告)日：1989-12-06

    申请号：GB8909403

    申请日：1989-04-25

    Applicant: CANON KK

    Inventor： YOSHIMURA KATSUJI ,  KANEDA KITAHIRO ,  HOMMA HIDEO ,  YAMADA KUNIHIKO ,  SUDA HIROFUMI ,  FUJIWARA AKIHIRO

    IPC: H04N5/235

    Abstract: An exposure control device having a light measuring area setting circuit which sets a light measuring area on an image sensing plane, a discriminating circuit which discriminates from each other varied states of the image sensing plane through video signal parts corresponding to the inside and the outside of the light measuring area and an exposure compensating circuit which compensates the state of exposure to light is arranged to shift the set position of the light measuring area to trace an object's image at least when the exposure compensating circuit is in operation. The operating modes of the device includes a first light measuring mode in which a quantity of light is measured on the basis of the average video signal level of the whole image sensing plane, a second light measuring mode in which the light quantity is measured with weight attached to a video signal part obtained from the inside of the light measuring area, and a third light measuring mode in which the light quantity is measured with weight attached to the video signal of the light measuring area by shifting the light measuring area to trace the object. The three light measuring modes are adaptively switched from one over to another.

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