Documentation page : https://stathpale.github.io/ALDC_EKG/html/index.html

by Palaiologos Efstathios

This C implementation of the ALDC-DR-EKG algorithm is part of an already completed and evaluated research and targets to demonstrate the benefits of the modifications that were applied to the basic ALDC-DR algorithm in order to improve its overall performance when compressing ECGs on the fly.

https://nemertes.lis.upatras.gr/jspui/handle/10889/12953

1. Compression contributes significantly to energy savings of mobile medical devices
2. Compressed information requires transmission channels with a smaller bandwidth.
3. Faster Transmission
4. Reduction of traffic in the transmission medium.

Take a look how it works :

1. It takes a part of the signal

   

2. It calculates the sequential difference of all the samples in that part

   

3. it calculates the sum of the absolute values of that part

   if sum is very small

   -it compresses that part with LEC encoder (1 Huffman Table)

   else

   -it splits that part to even smaller parts

   -it compresses every smaller part with ALEC3 encoder (3 Huffman Tables)

   -it keeps as the compressed version, the shorter bit stream among the 3

Benchmarks on the MIT ARYTHMIA DATABASE

https://ieeexplore.ieee.org/document/8418357

Benchmarks on Custom Dataset under Real-Time Operation of STM32F407VGT(84MHz) :

The Evaluation of the Proposed Compression Algorithms is performed using a Real-Time "Receipt--Compression--Transmission" scenario

On ekgmove dataset :

1. Three variations of ALDC Encoder

   • Hybrid ALEC3 and LEC
   • Hybrid ALEC3 and ALEC2
   • Hybrid ALEC2 and LEC

2. Two variations of ALEC Encoder

   • with 2 Huffman tables
   • with 3 Huffman tables

3. The Classic LEC encoder

Clone the directory into your system ( you may ignore the docs folder)

1. Read the documentation page https://stathpale.github.io/ALDC_EKG/html/index.html to see the available compilation options

2. Compile on linux :

• clang -O3 -Wall -std=c99 -o alekgc-dr aldc_encoder.c lectools.c fio.c -D __ALDC_3_1__ && ./alekgc-dr
• gcc -O3 -Wall -std=c99 -o alekgc-dr aldc_encoder.c lectools.c fio.c -D __ALDC_3_1__ && ./alekgc-dr

3. Compile on Windows either with clang or with VS

If you would like to give it a go contact me for the decoder at [email protected]