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--- |
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license: other |
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license_link: >- |
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https://github.st.com/AIS/stm32ai-modelzoo/raw/master/object_detection/LICENSE.md |
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pipeline_tag: object-detection |
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--- |
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# BlazeFace Front 128x128 Quantized |
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## **Use case** : `Object detection` |
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# Model description |
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BlazeFace Front 128x128 is a lightweight and efficient face detection model optimized for real-time applications on embedded devices. It is a variant of the BlazeFace architecture, designed specifically for detecting frontal faces at a resolution of 128x128 pixels. The model is quantized to int8 format using TensorFlow Lite converter to reduce memory footprint and improve inference speed on resource-constrained hardware. |
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BlazeFace is known for its fast inference and accuracy, making it suitable for applications such as face tracking, augmented reality, and user authentication. |
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## Network information |
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| Network information | Value | |
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|------------------------|-----------------| |
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| Framework | TensorFlow Lite | |
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| Quantization | int8 | |
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| Input resolution | 128x128 | |
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| Provenance | https://github.com/PINTO0309/PINTO_model_zoo/tree/main/030_BlazeFace | |
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## Network inputs / outputs |
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| Input Shape | Description | |
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|-------------|-------------| |
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| (1, 128, 128, 3) | Single 128x128 RGB image with FLOAT32 values between -1 and 1 | |
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| Output Shape | Description | |
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|--------------|-------------| |
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| (1, 512, 16) | FLOAT32 tensor containing bounding box coordinates and keypointss for detected faces | |
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| (1, 512, 1) | FLOAT32 tensor containing confidence scores for detected faces | |
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| (1, 384, 16) | FLOAT32 tensor containing bounding box coordinates and keypointss for detected faces | |
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| (1, 384, 1) | FLOAT32 tensor containing confidence scores for detected faces | |
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## Recommended Platforms |
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| Platform | Supported | Recommended | |
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|----------|-----------|-------------| |
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| STM32L0 | [] | [] | |
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| STM32L4 | [] | [] | |
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| STM32U5 | [] | [] | |
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| STM32H7 | [] | [] | |
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| STM32MP1 | [] | [] | |
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| STM32MP2 | [] | [] | |
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| STM32N6 | [x] | [x] | |
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## Performances |
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### Metrics |
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Performance metrics are measured using default STM32Cube.AI configurations with input/output allocated buffers. |
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| Model | Dataset | Format | Resolution | Series | Internal RAM (KB) | External RAM (KB) | Weights Flash (KB) | STM32Cube.AI version | STEdgeAI Core version | |
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|----------------------|---------------|--------|------------|---------|-------------------|-------------------|--------------------|----------------------|-----------------------| |
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| [BlazeFace Front 128x128 per channel](https://github.com/STMicroelectronics/stm32ai-modelzoo/tree/main/object_detection/face_detect_front/Public_pretrainedmodel_public_dataset/wider_face/blazeface_front_128_quant_pc_ff_od_wider_face.tflite) | WIDER FACE (frontal) | Int8 | 128x128x3 | STM32N6 | 528 | 0 | 150.97 | 10.2.0 | 2.2.0 | |
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### Reference **NPU** inference time (example) |
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| Model | Dataset | Format | Resolution | Board | Execution Engine | Inference time (ms) | Inf / sec | STM32Cube.AI version | STEdgeAI Core version | |
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|----------------------|---------------|--------|------------|----------------|------------------|---------------------|-----------|----------------------|-----------------------| |
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| [BlazeFace Front 128x128 per channel](https://github.com/STMicroelectronics/stm32ai-modelzoo/tree/main/object_detection/face_detect_front/Public_pretrainedmodel_public_dataset/wider_face/blazeface_front_128_quant_pc_ff_od_wider_face.tflite) | WIDER FACE (frontal) | Int8 | 128x128x3 | STM32N6570-DK | NPU/MCU | 5.09 | 196.3 | 10.2.0 | 2.2.0 | |
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## Integration and support |
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For integration examples and additional services, please refer to the STM32 AI model zoo services repository: |
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[https://github.com/STMicroelectronics/stm32ai-modelzoo-services](https://github.com/STMicroelectronics/stm32ai-modelzoo-services) |
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## References |
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- BlazeFace paper: [https://arxiv.org/abs/1907.05047](https://arxiv.org/abs/1907.05047) |
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- MediaPipe BlazeFace model repository: [https://github.com/PINTO0309/PINTO_model_zoo/tree/main/030_BlazeFace](https://github.com/PINTO0309/PINTO_model_zoo/tree/main/030_BlazeFace) |
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- WIDER FACE dataset: [http://shuoyang1213.me/WIDERFACE/](http://shuoyang1213.me/WIDERFACE/) |
