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    • 1. 发明授权
    • Color space conversion
    • 色彩空间转换
    • US08995018B1
    • 2015-03-31
    • US14312319
    • 2014-06-23
    • Marvell International Ltd.
    • Douglas G. Keithley
    • H04N1/60G06K15/02G06K15/10G06K15/12
    • H04N1/60G06K15/102G06K15/129G06K15/1878H04N1/6019H04N2201/0094
    • A color space converter converts data points from one color space to another color space using a lookup table. Color space converters may be used in any device that involves image processing, such as displays and printers. An interface receives an input value in a first color space. A controller access a lookup table stored in memory to determine an upper bound and a lower bound of a subset of the color space. An output value is interpolated between the upper bound and the lower bound using interpolation values. The interpolation values of the last subset in any dimension of the color space are modified by a scale factor to approximate ideal values.
    • 色彩空间转换器使用查找表将数据点从一个颜色空间转换到另一个颜色空间。 彩色空间转换器可用于涉及图像处理的任何设备,如显示器和打印机。 接口在第一个颜色空间中接收输入值。 控制器访问存储在存储器中的查找表,以确定颜色空间的子集的上限和下限。 使用插补值在上限和下限之间插值输出值。 颜色空间的任何维度中最后一个子集的内插值由比例因子修改为近似理想值。
    • 5. 发明授权
    • Exposure correction for scanners
    • 扫描仪曝光校正
    • US09041988B1
    • 2015-05-26
    • US14070224
    • 2013-11-01
    • Marvell International Ltd.
    • Douglas G. Keithley
    • H04N1/46H04N1/00
    • H04N1/00087H04N1/00005H04N1/40056H04N1/401
    • A method and apparatus for exposure correction in scanners are disclosed. In the method, exposure is corrected for pixels received in an image sensor array. Exposure time is tracked for the incoming pixel data and a calibration factor is determined for correcting the gain, and the calibration factor is adjusted based on the tracked exposure time. In the apparatus, a scanner includes an illumination source and a sensor for receiving pixel data. Using values stored in a memory, circuitry is provided for determining a calibration factor, for tracking exposure time for the pixel data and for adjusting the pixel data based on the calibration factor and exposure time.
    • 公开了一种用于扫描仪中的曝光校正的方法和装置。 在该方法中,针对在图像传感器阵列中接收的像素来校正曝光。 跟踪输入像素数据的曝光时间,并确定校准因子用于校正增益,并根据跟踪的曝光时间调整校准因子。 在该装置中,扫描器包括照明源和用于接收像素数据的传感器。 使用存储在存储器中的值,提供用于确定校准因子的电路,用于跟踪像素数据的曝光时间和基于校准因子和曝光时间来调整像素数据。