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    • 9. 发明授权
    • Image reading apparatus with A/D conversion and adjustment thereof
    • 具有A / D转换和调整的图像读取装置
    • US5748335A
    • 1998-05-05
    • US464079
    • 1995-06-05
    • Toshio HonmaNobuo MatsuokaShizuo HasegawaYasumichi SuzukiHiroshi ItagakiKenji Sasahara
    • Toshio HonmaNobuo MatsuokaShizuo HasegawaYasumichi SuzukiHiroshi ItagakiKenji Sasahara
    • H04N1/401H04N1/407H04N1/00
    • H04N1/4076H04N1/401
    • An image reading apparatus such as a color copying apparatus has a plurality of sensing CCD chips for converting an image of an object into an electrical signal, each sensing CCD chip having a plurality of sensing elements. The apparatus also has a circuit for converting the electrical signal into digital data. A first adjusting circuit is provided for conducting either an operation for obtaining level matching of the electrical signal converted by the sensing chips, or an operation for controlling the gain of the electrical signal converted by the sensing chips. The apparatus further has a second adjusting circuit for effecting compensation for fluctuation of characteristics of the sensing elements of the sensing chips, by making use of the digital data converted by the converting circuit, the second adjusting circuit being adapted for effecting the compensation on the basis of electrical signals which are produced as a result of conversion by the sensing chips from two objects having different levels of density from each other, such as white and black levels. An analog-to-digital converter may also be provided to convert analog data into digital data. In that case, first adjusting means will adjust the analog data discretely, through a step smaller than the quantizing step used in the A/D conversion, and a second adjusting means may preferably further adjust the analog data in accordance with digital data obtained through the A/D conversion.
    • 诸如彩色复印装置的图像读取装置具有用于将物体的图像转换为电信号的多个感测CCD芯片,每个感测CCD芯片具有多个感测元件。 该装置还具有用于将电信号转换成数字数据的电路。 提供第一调整电路用于进行用于获得由感测芯片转换的电信号的电平匹配的操作或用于控制由感测芯片转换的电信号的增益的操作。 该装置还具有第二调整电路,用于通过利用由转换电路转换的数字数据来实现对感测芯片的感测元件的特性的波动的补偿,第二调整电路适于在此基础上进行补偿 作为由感测芯片从具有彼此不同密度水平的两个物体(例如白色和黑色水平)转换而产生的电信号。 还可以提供模拟数字转换器以将模拟数据转换为数字数据。 在这种情况下,第一调整装置将通过小于A / D转换中使用的量化步骤的步长离散地调节模拟数据,并且第二调整装置可以优选地根据通过 A / D转换。
    • 10. 发明授权
    • Image reading apparatus with A/D conversion and adjustment thereof
    • 具有A / D转换和调整的图像读取装置
    • US5596427A
    • 1997-01-21
    • US274351
    • 1994-07-13
    • Toshio HonmaNobuo MatsuokaShizuo HasegawaYasumichi SuzukiHiroshi ItagakiKenji Sasahara
    • Toshio HonmaNobuo MatsuokaShizuo HasegawaYasumichi SuzukiHiroshi ItagakiKenji Sasahara
    • H04N1/401H04N1/407H04N1/03
    • H04N1/4076H04N1/401
    • An image reading apparatus such as a color copying apparatus has a plurality of sensing CCD chips for converting an image of an object into an electrical signal, each sensing CCD chip having a plurality of sensing elements. The apparatus also has a circuit for converting the electrical signal into digital data. A first adjusting circuit is provided for conducting either an operation for obtaining level matching of the electrical signal converted by the sensing chips, or an operation for controlling the gain of the electrical signal converted by the sensing chips. The apparatus further has a second adjusting circuit for effecting compensation for fluctuation of characteristics of the sensing elements of the sensing chips, by making use of the digital data converted by the converting circuit, the second adjusting circuit being adapted for effecting the compensation on the basis of electrical signals which are produced as a result of conversion by the sensing chips from two objects having different levels of density from each other, such as white and black levels. An analog-to digital converter may also be provided to convert analog data into digital data may also be provided. In that case, first adjusting means will adjust the analog data discretely, through a step smaller than the quantizing step used in the A/D conversion, and a second adjusting means may preferably further adjust the analog data in accordance with digital data obtained through the A/D conversion.
    • 诸如彩色复印装置的图像读取装置具有用于将物体的图像转换为电信号的多个感测CCD芯片,每个感测CCD芯片具有多个感测元件。 该装置还具有用于将电信号转换成数字数据的电路。 提供第一调整电路用于进行用于获得由感测芯片转换的电信号的电平匹配的操作或用于控制由感测芯片转换的电信号的增益的操作。 该装置还具有第二调整电路,用于通过利用由转换电路转换的数字数据来实现对感测芯片的感测元件的特性的波动的补偿,第二调整电路适于在此基础上进行补偿 作为由感测芯片从具有彼此不同密度水平的两个物体(例如白色和黑色水平)转换而产生的电信号。 还可以提供模拟数字转换器以将模拟数据转换成数字数据。 在这种情况下,第一调整装置将通过小于A / D转换中使用的量化步骤的步长离散地调节模拟数据,并且第二调整装置可以优选地根据通过 A / D转换。