This crate provides some basic structures and methods for solving object detections tasks via OpenCV's DNN module. Currently implemented and tested workflows:
Network type | Darknet | ONNX |
---|---|---|
YOLO v3 tiny | :white_check_mark: | :warning: (need to test) |
YOLO v4 tiny | :white_check_mark: | :warning: (need to test) |
YOLO v7 tiny | :white_check_mark: | :warning: (need to test) |
YOLO v3 | :white_check_mark: | :warning: (need to test) |
YOLO v4 | :white_check_mark: | :warning: (need to test) |
YOLO v7 | :white_check_mark: | :warning: (need to test) |
YOLO v8 n | :x: (is it even possible?) | :white_check_mark: |
YOLO v8 s | :x: (is it even possible?) | :white_check_mark: |
YOLO v8 m | :x: (is it even possible?) | :white_check_mark: |
YOLO v8 l | :x: (is it even possible?) | :white_check_mark: |
YOLO v8 x | :x: (is it even possible?) | :white_check_mark: |
- Why?
Well, I just tired a bit of boilerplating (model initializing, postprocessing functions and etc.) in my both private and public projects.
- When it is usefull?
Well, there are several circumstances when you may need this crate:
- Why no YOLOv5?
I think there is a difference in postprocessing stuff between v8 and v5 versions. I need more time to investigate what should be done exactly to make v5 work.
- What OpenCV's version is tested?
I've tested it with v4.7.0. Rust bindings version: v0.66.0
- Are wrapper structures thread safe?
I'm not sure it is intended to be used in multiple threads (PR's are welcome). But I think you should use some queue mechanism if you want to give "async" acces to provided structs.
For sure you must have OpenCV installed with DNN extra module. If you need to ulitize power of GPU/OpenVINO then you need to consider to include corresponding extra modules too.
I love to use this Makefile with little adjustment (OpenCV's version / enabling python bindings) for my needs.
Prepare neural network: train it or get pretrained one. I provide pretty simple Bash scripts to download "small" versions of YOLO
Notice that "v8" script downloads Pytorch-based weights and converts it into ONNX one via ultralytics
package for Python.
There are some examples, but let me guide you step-by-step
Add this crate to your's Cargo.toml
:
cargo add od_opencv
Add OpenCV's bindings crate to Cargo.toml
also:
# I'm using 0.66 version
cargo add opencv@0.66
Download pretrained or use your own neural network.
I will use pretrained weights from prerequisites section
Import "basic" OpenCV stuff in yours main.rs
file:
use opencv::{
core::{Scalar, Vector},
imgcodecs::imread,
imgcodecs::imwrite,
imgproc::LINE_4,
imgproc::rectangle,
dnn::DNN_BACKEND_CUDA, // I will utilize my GPU to perform faster inference. Your way may vary
dnn::DNN_TARGET_CUDA,
};
Import crate
use od_opencv::{
model_format::ModelFormat,
// I'll use YOLOv8 by Ultralytics.
// If you prefer traditional YOLO, then import it as:
// model_classic::ModelYOLOClassic
model_ultralytics::ModelUltralyticsV8
};
Prepare model
// Define classes (in this case we consider 80 COCO labels)
let classes_labels: Vec<&str> = vec!["person", "bicycle", "car", "motorbike", "aeroplane", "bus", "train", "truck", "boat", "traffic light", "fire hydrant", "stop sign", "parking meter", "bench", "bird", "cat", "dog", "horse", "sheep", "cow", "elephant", "bear", "zebra", "giraffe", "backpack", "umbrella", "handbag", "tie", "suitcase", "frisbee", "skis", "snowboard", "sports ball", "kite", "baseball bat", "baseball glove", "skateboard", "surfboard", "tennis racket", "bottle", "wine glass", "cup", "fork", "knife", "spoon", "bowl", "banana", "apple", "sandwich", "orange", "broccoli", "carrot", "hot dog", "pizza", "donut", "cake", "chair", "sofa", "pottedplant", "bed", "diningtable", "toilet", "tvmonitor", "laptop", "mouse", "remote", "keyboard", "cell phone", "microwave", "oven", "toaster", "sink", "refrigerator", "book", "clock", "vase", "scissors", "teddy bear", "hair drier", "toothbrush"];
// Define format for OpenCV's DNN module
let mf = ModelFormat::ONNX;
// Define model's input size
let net_width = 640;
let net_height = 640;
// Initialize optional filters.
// E.g.: if you do want to find only dogs and cats and you can't re-train neural network,
// then you can just place `vec![15, 16]` to filter dogs and cats (15 - index of `cat` in class labels, 16 - `dog`)
// let class_filters: Vec<usize> = vec![15, 16];
let class_filters: Vec<usize> = vec![];
// Initialize model itself
let mut model = ModelUltralyticsV8::new_from_file("pretrained/yolov8n.onnx", None, (net_width, net_height), mf, DNN_BACKEND_CUDA, DNN_TARGET_CUDA, class_filters).unwrap();
// Read image into the OpenCV's Mat object
// Define it as mutable since we are going to put bounding boxes onto it.
let mut frame = imread("images/dog.jpg", 1).unwrap();
// Feed forward image through the model
let (bboxes, class_ids, confidences) = model.forward(&frame, 0.25, 0.4).unwrap();
// Process results
for (i, bbox) in bboxes.iter().enumerate() {
// Place bounding boxes onto the image
rectangle(&mut frame, *bbox, Scalar::from((0.0, 255.0, 0.0)), 2, LINE_4, 0).unwrap();
// Debug output to stdin
println!("Class: {}", classes_labels[class_ids[i]]);
println!("\tBounding box: {:?}", bbox);
println!("\tConfidences: {}", confidences[i]);
}
// Finally save the updated image to the file system
imwrite("images/dog_yolov8_n.jpg", &frame, &Vector::new()).unwrap();
You are good to go
cargo run
If anything is going wrong, feel free to open an issue