According to analyses of the real-time performance of the visual prosthesis image processing system, down-sampling is a key factor which influences the processing speed. Based on these analyses, the algorithm of grid sampled averaging was proposed for down-sampling. Then the effect of grid parameters on the result and algorithm complexity was evaluated by using the regional-averaging algorithm as a reference. Our research shows that the grid-averaging algorithm could reduce the computation burden by 90%or more, with no significant difference from the regional-averaging algorithm.% 对视觉假体图像处理系统的实时性分析表明，降采样环节的运算量是影响图像处理实时性的重要因素。为此，提出了基于间隔抽样均值的降采样算法，并以区域均值降采样算法为参照，统计分析了间隔抽样参数对图像处理效果和算法复杂度的影响。研究表明，在处理效果无显著差异的前提下，间隔抽样均值算法可以使降采样环节的运算量降低90%以上。
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