Embedded Image Processing Optimization (SABRE i.MX6)

Authors: Ana Beatriz Santos de Oliveira, Ana Luiza Diniz Santos, Larissa Anielle Terrinha de Oliveira

This project optimizes a C++ Median and Sobel filter pipeline for the ARM Cortex-A9 processor We applied manual (algorithmic, data access) and compiler (-O3) optimizations.

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📂 File Structure

│   myproject.cpp
│   my_functions.hpp
│   projet_24_v1.cpp
│   README.md
│
└───Versions
        algorithm_changes
        computational_reogarnization
        loop_unrolling_and_loop_optimization
        optimal_data_access_where_possible
        removal_of_redundant_computations

• projet_24_v1.cpp: Main file for benchmarking.
• my_functions.cpp: Our optimized filter implementations.

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Files:

projet_24_v1.cpp:

The main application file, which handles video I/O, benchmarking, and calls the filter functions.

my_functions.cpp

The core implementation file containing the final optimized versions of my_sobel() and my_median().

/Versions/

This directory contains the source code snapshots from each progressive optimization step (e.g., algorithm_changes, loop_unrolling, optimal_data_access) for analysis, as described in the methodology

🛠️ Build and Run (Optimized)

Open on file explorer

Ctrl + L

sftp://linaro@192.168.1.2

Run

0. Transfer Files:

scp my_functions.hpp linaro@192.168.1.2:~/br/

scp my_functions.cpp projet_24_v1.cpp linaro@192.168.1.2:~/br/

1.Conection

ssh -X linaro@192.168.1.2

export DISPLAY=localhost:10.0

2. Test

xeyes

3. See cameras to change on the code

sudo rm /dev/video*

ls /dev/video*

4. Compile (on board):

cd ~/br

g++ -O3 `pkg-config --cflags opencv` projet_24_v1.cpp my_functions.cpp `pkg-config --libs opencv` -o meu_codigo -lm

5. Run (on board):

./meu_codigo 3

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