###### tags: `jptw` `thesis` `meeting`
# 20200812 DSP Group Meeting

## Review Work
### Fingerprinting
1. Find Peaks in spectrogram
Pass through a HP Filter and then find peaks with ["Dilation and Erosion"]((https://sites.google.com/a/ms.ttu.edu.tw/cse2012dance-robot/yan-jiu-cheng-guo/opencv-ruan-ti-she-ji/qin-shi-yu-peng-zhang)).

 
 

2. Record each peak with the temporal difference among its neighborhood, and hash with 'SHA1' algorithm.

::: warning
The beauty is that a good hash function will not only return the same output integer each time the input is the same, but also that very few different inputs will have the same output.
:::

**TODO**
> Add time information for fingerprinting in DB
> Traditional: Clear source, dirty target
> Our case: **Dirty** source, clear target

## Feedback
- Good point for preprocessing with noise reduction!