针对CMOS图像传感器芯片中的自动白平衡图像处理电路，提出了一种便于硬件实现的增益计算方法，并在此基础上实现了一个用于CMOS图像传感器芯片的自动白平衡算法。该算法将增益计算的计算法与迭代法结合使用，并用比较器和移位寄存器来取代复杂的组合逻辑单元，在不增加硬件开销的基础上提高了计算精度与处理速度。

A method of gain calculation for auto white balance is proposed which is suitable for hardware implement in CMOS image sensors chip. Based on the method, an auto white balance algorithm used in CMOS image sensors chip is completed. Iterative method and calculation method are combined in this algorithm, and comparator and shift registers are used instead of complex combination logic cells. The computation accuracy and processing speed are improved without hardware expenses.