没有预期的更改时进行更改点检测

时间：2019-06-12 13:14:08

标签： r

问题

我有多个驾驶员的油门踏板位置和制动踏板力变量。 我想知道他们何时开始踩任一踏板。在大多数情况下，驾驶员只能踩油门踏板或踩刹车踏板。例如：

enter image description here

左边的小图显示了完整的数据，右边的图显示了Observe行之后的数据。我只对Observe行之后的数据感兴趣。请注意，油门踏板位置（绿色点）的范围是0 -1，制动踏板力的范围是0-82 kg。这些图显示了比例矢量。

在这里，即使驾驶员踩下油门踏板，制动踏板力的最大变化也不能视为换挡点。在左图中更清楚。

期望的结果

我需要更改开始的点的索引（踩下油门或制动踏板）。但是，如果变化很小，如图中的制动踏板力，则不应检测到任何变化点。

我尝试过的

我使用了changepoint软件包，如下所示：

数据（请参见末尾的示例数据veh）

veh <- perc_CF_lead_veh_only %>% filter(file.ID == "truck_neg_100_2_Ahmed.hdf5",
                                        frames > frame_obs) %>% 
  select(file.ID, frames, frame_obs, ED_gas_pedal_pos, ED_brake_pedal_force_kg)

变更点检测

library(changepoint)

start_change_speed <- veh %>% 
  group_by(file.ID) %>% 
  filter(frames > frame_obs) %>% 
  summarize(brake_start_index = cpts(cpt.meanvar(ED_brake_pedal_force_kg)),
            gas_start_index = cpts(cpt.meanvar(ED_gas_pedal_pos))) %>% 
  ungroup()

结果：

> start_change_speed
# A tibble: 1 x 3
  file.ID                    brake_start_index gas_start_index
  <chr>                                  <dbl>           <dbl>
1 truck_neg_100_2_Ahmed.hdf5                53             342

plot(cpt.meanvar(veh$ED_brake_pedal_force_kg))

enter image description here

  

我不想将此检测到的变化点（在制动踏板力中）视为变化，因为它不是实际变化，但可能是由于测量中的噪音/误差引起的。 

plot(cpt.meanvar(veh$ED_gas_pedal_pos))

enter image description here

示例数据

dput(veh %>% select(-file.ID))
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0 个答案:

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