而对于计算障碍，一个最合适的预测指标就是在计算一张纸上少数点的个数时所花费异常长的缓慢，而这一任务对于绝大多数人来说是非常简单的。
The best single predictor of dyscalculia, by contrast, is abnormal slowness in counting a few dots on a page, a task that most find trivially easy.
由此，可以演化出根据设备特性反馈改变簇点中少数点多少的绿噪声半调算法，使得程序的健壮性提高，对点增益现象可以很好的控制。
Based on these theories, we can deduce the error diffusion with output-dependent feedback method that can control the dot-gain distortion well.
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