add samples

wangrong

2025-03-19 291afb9c81aae1d15d9e3edcea618d0a2e1fc5a6

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#pragma once 
 
#include "../vp_secondary_infer_node.h" 
 
namespace vp_nodes { 
    // face feature encoder based on SFace, update embeddings of vp_frame_face_target 
    // https://github.com/opencv/opencv/blob/4.x/modules/objdetect/src/face_recognize.cpp 
    // https://github.com/zhongyy/SFace 
    class vp_sface_feature_encoder_node: public vp_secondary_infer_node 
    { 
    private: 
        // get transform matrix for aglin face 
        cv::Mat getSimilarityTransformMatrix(float src[5][2]); 
        // align and crop 
        void alignCrop(cv::Mat& _src_img, float _src_point[5][2], cv::Mat& _aligned_img); 
    protected: 
        // override prepare as sface has an additional logic for face align before preprocess 
        virtual void prepare(const std::vector<std::shared_ptr<vp_objects::vp_frame_meta>>& frame_meta_with_batch, std::vector<cv::Mat>& mats_to_infer) override; 
 
        virtual void postprocess(const std::vector<cv::Mat>& raw_outputs, const std::vector<std::shared_ptr<vp_objects::vp_frame_meta>>& frame_meta_with_batch) override; 
    public: 
        vp_sface_feature_encoder_node(std::string node_name, std::string model_path); 
        ~vp_sface_feature_encoder_node(); 
    }; 
 
 }