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This commit is contained in:
Hu Chuqi
2023-01-06 09:34:28 +08:00
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[English](README.md) | 简体中文
# SCRFD C++部署示例
本目录下提供`infer.cc`快速完成SCRFD在CPU/GPU以及GPU上通过TensorRT加速部署的示例。
在部署前,需确认以下两个步骤
- 1. 软硬件环境满足要求,参考[FastDeploy环境要求](../../../../../docs/cn/build_and_install/download_prebuilt_libraries.md)
- 2. 根据开发环境下载预编译部署库和samples代码参考[FastDeploy预编译库](../../../../../docs/cn/build_and_install/download_prebuilt_libraries.md)
以Linux上CPU推理为例在本目录执行如下命令即可完成编译测试支持此模型需保证FastDeploy版本0.7.0以上(x.x.x>=0.7.0)
```bash
mkdir build
cd build
# 下载FastDeploy预编译库用户可在上文提到的`FastDeploy预编译库`中自行选择合适的版本使用
wget https://bj.bcebos.com/fastdeploy/release/cpp/fastdeploy-linux-x64-x.x.x.tgz
tar xvf fastdeploy-linux-x64-x.x.x.tgz
cmake .. -DFASTDEPLOY_INSTALL_DIR=${PWD}/fastdeploy-linux-x64-x.x.x
make -j
#下载官方转换好的SCRFD模型文件和测试图片
wget https://bj.bcebos.com/paddlehub/fastdeploy/scrfd_500m_bnkps_shape640x640.onnx
wget https://raw.githubusercontent.com/DefTruth/lite.ai.toolkit/main/examples/lite/resources/test_lite_face_detector_3.jpg
# CPU推理
./infer_demo scrfd_500m_bnkps_shape640x640.onnx test_lite_face_detector_3.jpg 0
# GPU推理
./infer_demo scrfd_500m_bnkps_shape640x640.onnx test_lite_face_detector_3.jpg 1
# GPU上TensorRT推理
./infer_demo scrfd_500m_bnkps_shape640x640.onnx test_lite_face_detector_3.jpg 2
```
运行完成可视化结果如下图所示
<img width="640" src="https://user-images.githubusercontent.com/67993288/184301789-1981d065-208f-4a6b-857c-9a0f9a63e0b1.jpg">
以上命令只适用于Linux或MacOS, Windows下SDK的使用方式请参考:
- [如何在Windows中使用FastDeploy C++ SDK](../../../../../docs/cn/faq/use_sdk_on_windows.md)
## SCRFD C++接口
### SCRFD类
```c++
fastdeploy::vision::facedet::SCRFD(
const string& model_file,
const string& params_file = "",
const RuntimeOption& runtime_option = RuntimeOption(),
const ModelFormat& model_format = ModelFormat::ONNX)
```
SCRFD模型加载和初始化其中model_file为导出的ONNX模型格式。
**参数**
> * **model_file**(str): 模型文件路径
> * **params_file**(str): 参数文件路径当模型格式为ONNX时此参数传入空字符串即可
> * **runtime_option**(RuntimeOption): 后端推理配置默认为None即采用默认配置
> * **model_format**(ModelFormat): 模型格式默认为ONNX格式
#### Predict函数
> ```c++
> SCRFD::Predict(cv::Mat* im, FaceDetectionResult* result,
> float conf_threshold = 0.25,
> float nms_iou_threshold = 0.5)
> ```
>
> 模型预测接口,输入图像直接输出检测结果。
>
> **参数**
>
> > * **im**: 输入图像注意需为HWCBGR格式
> > * **result**: 检测结果,包括检测框,各个框的置信度, FaceDetectionResult说明参考[视觉模型预测结果](../../../../../docs/api/vision_results/)
> > * **conf_threshold**: 检测框置信度过滤阈值
> > * **nms_iou_threshold**: NMS处理过程中iou阈值
### 类成员变量
#### 预处理参数
用户可按照自己的实际需求,修改下列预处理参数,从而影响最终的推理和部署效果
> > * **size**(vector&lt;int&gt;): 通过此参数修改预处理过程中resize的大小包含两个整型元素表示[width, height], 默认值为[640, 640]
> > * **padding_value**(vector&lt;float&gt;): 通过此参数可以修改图片在resize时候做填充(padding)的值, 包含三个浮点型元素, 分别表示三个通道的值, 默认值为[114, 114, 114]
> > * **is_no_pad**(bool): 通过此参数让图片是否通过填充的方式进行resize, `is_no_pad=ture` 表示不使用填充的方式,默认值为`is_no_pad=false`
> > * **is_mini_pad**(bool): 通过此参数可以将resize之后图像的宽高这是为最接近`size`成员变量的值, 并且满足填充的像素大小是可以被`stride`成员变量整除的。默认值为`is_mini_pad=false`
> > * **stride**(int): 配合`stris_mini_pad`成员变量使用, 默认值为`stride=32`
> > * **downsample_strides**(vector&lt;int&gt;): 通过此参数可以修改生成anchor的特征图的下采样倍数, 包含三个整型元素, 分别表示默认的生成anchor的下采样倍数, 默认值为[8, 16, 32]
> > * **landmarks_per_face**(int): 如果使用具有人脸关键点的输出, 可以修改人脸关键点数量, 默认值为`landmarks_per_face=5`
> > * **use_kps**(bool): 通过此参数可以设置模型是否使用关键点,如果ONNX文件没有关键点输出则需要将`use_kps=false`, 并将`landmarks_per_face=0`, 默认值为`use_kps=true`
> > * **num_anchors**(int): 通过此参数可以设置每个锚点预测的anchor数量, 需要跟进训练模型的参数设定, 默认值为`num_anchors=2`
- [模型介绍](../../)
- [Python部署](../python)
- [视觉模型预测结果](../../../../../docs/api/vision_results/)
- [如何切换模型推理后端引擎](../../../../../docs/cn/faq/how_to_change_backend.md)