Peter Woolery
62931e26ff
When a blob briefly drops below CV_MIN_BLOB_PX, its track is killed and respawns, causing the same person to generate multiple counts per visit (~50/min observed in field). Add a per-direction cooldown (default 5 frames ≈ 0.8s @ 5 fps) that drops subsequent entries (or exits) within the window of the last counted one. Entry and exit cooldowns are tracked independently. Fixed at compile time for now; exposing as a server-push tunable is deferred until the server-push-config branch lands. See docs/server-prompt-crossing- cooldown.md for the server-side coordination notes. Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
49 lines
1.3 KiB
C++
49 lines
1.3 KiB
C++
// firmware/lib/cv/cv.h
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#pragma once
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#include <stdint.h>
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#include <vector>
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static const int CV_W = 96;
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static const int CV_H = 96;
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static const int CV_PIXELS = CV_W * CV_H;
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static const uint8_t CV_DIFF_THRESH = 30;
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static const int CV_MIN_BLOB_PX = 64;
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static const float CV_MAX_MOVE = 15.0f;
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static const int CV_MAX_MISSED = 10;
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// Per-direction crossing cooldown. Any same-direction crossing whose frame gap
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// is strictly less than this value is dropped. At 5 fps, a value of 5 → ≈0.8s
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// suppression window. Purpose: mask track churn (blob briefly drops below
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// min_blob_px, track dies & respawns, re-crosses).
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static const uint32_t CV_CROSSING_COOLDOWN_FRAMES = 5;
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struct CVTrack {
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int id;
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float x, y;
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bool above_line;
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int missed;
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};
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struct CVState {
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uint8_t background[CV_PIXELS];
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bool bg_valid;
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uint32_t last_motion_frame;
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uint32_t frame_index;
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int next_id;
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std::vector<CVTrack> tracks;
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int entries;
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int exits;
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uint32_t last_entry_frame; // 0 = never; frame_index of last counted entry
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uint32_t last_exit_frame; // 0 = never; frame_index of last counted exit
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};
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struct CVResult {
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int entries_delta;
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int exits_delta;
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};
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void cv_init(CVState& state);
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CVResult cv_process(CVState& state, const uint8_t* frame, uint8_t line_pct);
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void cv_reset_counts(CVState& state);
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