线性CCD的曝光时间

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PixelAverageVoltageError = TargetPixelAverageVoltage - PixelAverageVoltage;//偏差
    if(PixelAverageVoltageError < -TargetPixelAverageVoltageAllowError)
    {
      PixelAverageVoltageError = 0- PixelAverageVoltageError ;
      PixelAverageVoltageError /= 5;
      if(PixelAverageVoltageError > 10 )
         PixelAverageVoltageError = 10 ;
       IntegrationTime -= PixelAverageVoltageError;
    }
    if(PixelAverageVoltageError > TargetPixelAverageVoltageAllowError)
    {
        PixelAverageVoltageError /= 5;
        if(PixelAverageVoltageError > 10 )
           PixelAverageVoltageError = 10 ;
        IntegrationTime += PixelAverageVoltageError;}

/*   
    uart_putchar(UART0,0XAA) ;//发送字节
    uart_putchar(UART0,PixelAverageVoltage) ;
    uart_putchar(UART0,PixelAverageVoltageError) ;
    uart_putchar(UART0,IntegrationTime) ;
*/   
    if(IntegrationTime <= 1)
        IntegrationTime = 1;
    if(IntegrationTime >= 100)
        IntegrationTime = 100;
}

这程序在计算曝光时间的原理是什么？