camera_diff_detection.h

#pragma once
 
#include "base_detection_module.h"
#include "motion_data.h"
 
class CameraDiffDetection : public BaseDetectionModule
{
private:
    // Sensitivity parameters (tune these for your environment)
    // Resolution: QVGA is 320x240 = 76,800 pixels (optimized for fast overlay encoding)
    static const int FRAME_WIDTH = 320;   
    static const int FRAME_HEIGHT = 240;  
    static const int DIFF_THRESHOLD = 20; 
    static const int MOTION_THRESHOLD =
        150; 
    static const int CENTER_DEADZONE = 20; 
 
    uint8_t* _prev_frame;    
    uint8_t* _curr_frame;    
    uint8_t* _diff_buffer;   
    bool _buffers_allocated; 
    bool _first_frame;       
 
    // Motion tracking data
    MotionData _last_motion_data;      
    int _last_centroid_x;              
    int _last_centroid_y;              
    DetectionMetrics _current_metrics; 
 
public:
    CameraDiffDetection();
    ~CameraDiffDetection();
 
    std::tuple<MoveX, MoveY> detect_object(camera_buffer_t frame) override;
 
    MotionData get_motion_data() const { return this->_last_motion_data; }
 
    DetectionMetrics get_detection_metrics() const { return this->_current_metrics; }
 
private:
    bool jpeg_to_greyscale(void* frame, uint8_t* output);
 
    bool find_motion(uint8_t* prev, uint8_t* curr, int width, int height, int& center_x, int& center_y,
                     int& pixel_count);
 
    void calculate_fps();
};