UIAcceleration过滤 [英] UIAcceleration filtering

问题描述

我在Apple指南中找到了下面的代码：

I found the following piece of code in apple guidelines:

- (void)accelerometer:(UIAccelerometer*)accelerometer didAccelerate:(UIAcceleration*)acceleration
{
    //Use a basic low-pass filter to only keep the gravity in the accelerometer values
    accel[0] = acceleration.x * kFilteringFactor + accel[0] * (1.0 - kFilteringFactor);
    accel[1] = acceleration.y * kFilteringFactor + accel[1] * (1.0 - kFilteringFactor);
    accel[2] = acceleration.z * kFilteringFactor + accel[2] * (1.0 - kFilteringFactor);
}

究竟做了什么？这个低通滤波器是什么？
为什么我必须申请？

What does it exactly do? What is this low-pass filter? Why do I have to apply it?

提前谢谢。

推荐答案

你需要做什么取决于你需要的价值，但基本的想法是减少手部运动等造成的振动的影响。如果你把原始加速度值作为重力矢量处理，你会得到很多抖动。

What you need to do depends on what you need the value for, but the basic idea is to reduce the effect of vibrations from hand movements and such. If you take the raw acceleration values and treat them as a gravity vector, you’ll get a lot of jitter.

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