---
license: agpl-3.0
language:
- en
base_model:
- YOLO26
pipeline_tag: object-detection
tags:
- Axera
- YOLO26-OBB
- NPU
- Ultralytics
- Oriented Object Detection
- Rotated Bounding Box
---

# YOLO26-OBB

This version of **YOLOv26-OBB** (Oriented Bounding Box) has been converted to run on the Axera NPU using **w8a16** quantization. It is optimized for detecting rotated objects with high precision.

Compatible with Pulsar2 version: 5.1.

## Convert tools links:

For those who are interested in model conversion, you can try to export axmodel through:
- [The repo of AXera Platform](https://github.com/AXERA-TECH/ax-samples), where you can get the detailed guide.
- [Pulsar2 Link, How to Convert ONNX to axmodel](https://pulsar2-docs.readthedocs.io/en/latest/pulsar2/introduction.html)

## Support Platform

- **AX650N/AX8850**
  - [M4N-Dock(爱芯派Pro)](https://wiki.sipeed.com/hardware/zh/maixIV/m4ndock/m4ndock.html)
  - [M.2 Accelerator card](https://docs.m5stack.com/en/ai_hardware/LLM-8850_Card)
- **AX630C**
  - [爱芯派2](https://axera-pi-2-docs-cn.readthedocs.io/zh-cn/latest/index.html)
  - [Module-LLM](https://docs.m5stack.com/zh_CN/module/Module-LLM)
  - [LLM630 Compute Kit](https://docs.m5stack.com/zh_CN/core/LLM630%20Compute%20Kit)
- **AX615**
- **AX637**

### Performance Statistics

#### AX650N

| Model | Latency(ms) npu1 | Latency(ms) npu3 |
| :--- | :---: | :---: |
| **yolo26n-obb** | 9.426 | 3.432 |
| **yolo26s-obb** | 24.456| 9.612 |
| **yolo26m-obb** | 69.012 | 27.254 |
| **yolo26l-obb** | 88.472 | 36.599 |
| **yolo26x-obb** |  196.579 | 71.008 |


#### AX630C

| Model | Latency(ms) npu1 | Latency(ms) npu2 |
| :--- | :---: | :---: |
| **yolo26n-obb**| 29.515 | 23.724 |
| **yolo26s-obb**| 61.693 | 47.572 |
| **yolo26m-obb**| 161.482] | 110.556 |
| **yolo26l-obb**| 205.981 | 148.211 |
| **yolo26x-obb**| 501.142 | 294.563 |


#### AX615

| Model | Latency(ms) npu1 |
| :--- | :---: |
| **yolo26n-obb**| 54.514 |
| **yolo26s-obb**| 156.599 |



#### AX637

| Model | Latency(ms) |
| :--- | :---: |
| **yolo26s-obb**| 26.364 |
| **yolo26l-obb**| 88.019 |
| **yolo26x-obb**| 88.019 |

## How to use

Download all files from this repository to the device.

### python env requirement

#### pyaxengine

https://github.com/AXERA-TECH/pyaxengine

```bash
wget https://github.com/AXERA-TECH/pyaxengine/releases/download/0.1.3.rc2/axengine-0.1.3-py3-none-any.whl
pip install axengine-0.1.3-py3-none-any.whl
```

### Inference with AX650 Host, such as M4N-Dock(爱芯派Pro)

Input image:
![](boats.jpg)

run
```bash
 python3 ax_infer.py --model-path yolo26l-obb_npu3.axmodel --test-img boats.jpg
```

```bash
root@ax650:~/yolo26_obb# python3 ax_infer.py --model_path yolo26l-obb_npu3.axmodel --test_img boats.jpg
[INFO] Available providers:  ['AxEngineExecutionProvider', 'AXCLRTExecutionProvider']
usage: ax_infer.py [-h] [--model-path MODEL_PATH] [--test-img TEST_IMG] [--img-save-path IMG_SAVE_PATH]
                   [--score-thres SCORE_THRES] [--nms-thres NMS_THRES] [--num-classes NUM_CLASSES]
                   [--providers PROVIDERS]
ax_infer.py: error: unrecognized arguments: --model_path yolo26l-obb_npu3.axmodel --test_img boats.jpg
root@ax650:~/yolo26_obb# python3 ax_infer.py --model-path yolo26l-obb_npu3.axmodel --test-img boats.jpg
[INFO] Available providers:  ['AxEngineExecutionProvider', 'AXCLRTExecutionProvider']
[INFO] Using provider: AxEngineExecutionProvider
[INFO] Chip type: ChipType.MC50
[INFO] VNPU type: VNPUType.DISABLED
[INFO] Engine version: 2.12.0s
[INFO] Model type: 2 (triple core)
[INFO] Compiler version: 5.2-dirty a6f1799a-dirty
[YOLO26-OBB] [13:21:27.889] [DEBUG] Load model time = 485.62 ms
[YOLO26-OBB] [13:21:27.934] [DEBUG] Pre-process time = 13.80 ms
[YOLO26-OBB] [13:21:27.990] [DEBUG] Forward time = 55.92 ms
[YOLO26-OBB] [13:21:28.004] [DEBUG] Post-process time = 12.79 ms
[YOLO26-OBB] [13:21:28.034] [INFO] Draw Results (182 oriented objects):
[YOLO26-OBB] [13:21:28.035] [INFO]   ship                 conf=0.90 cx=770.3 cy=183.5 w=103.2 h=31.2 theta=+23.6deg
...
[YOLO26-OBB] [13:21:28.144] [INFO]   ship                 conf=0.25 cx=484.9 cy=5.2 w=26.2 h=15.6 theta=+13.1deg
[YOLO26-OBB] [13:21:28.145] [INFO]   ship                 conf=0.25 cx=1770.5 cy=660.5 w=105.5 h=35.2 theta=+23.6deg
[YOLO26-OBB] [13:21:28.189] [INFO] Saved to result_yolo26_obb.jpg
```

Output image:
![](result_yolo26_obb.jpg)
```