HighwayEventDet/pipeline/handler/graffiti_visualizer.py

import numpy as np
import cv2
import math
from ..base_processor import BaseProcessor
from ..pipeline_data import PipelineData


class GraffitiVisualizer(BaseProcessor):
    """涂鸦可视化处理器：绘制热力图和方向箭头"""

    def __init__(self, name: str = "涂鸦可视化处理器"):
        super().__init__(name)
        # 可调参数
        self.MAX_HEAT = 10.0
        self.ARROW_LEN_MIN = 10.0
        self.GRID_STEP = 40
        self.GRID_HEAT_THRESHOLD = 0.6
        self.GRID_DRAW_EVERY = 2
        self.FULL_DECAY_EVERY = 30

        self.frame_idx = 0

    def process(self, data: PipelineData) -> PipelineData:
        """绘制涂鸦可视化"""
        if data.frame is None:
            return data

        self.frame_idx = data.frame_idx
        vis = data.frame.copy()

        # 获取涂鸦数据
        heat_map = data.get_data("graffiti", "heat_map")
        dir_x_map = data.get_data("graffiti", "dir_x_map")
        dir_y_map = data.get_data("graffiti", "dir_y_map")
        track_hist = data.get_data("graffiti", "track_hist")
        current_events = data.get_data("retrograde", "current_events", {})
        all_events = data.get_data("retrograde", "all_events", {})

        # 绘制热力图
        if heat_map is not None:
            heat_norm = np.clip(heat_map / self.MAX_HEAT, 0.0, 1.0)
            heat_u8 = (heat_norm * 255).astype(np.uint8)
            red_overlay = np.zeros_like(vis)
            red_overlay[:, :, 2] = heat_u8
            alpha = 0.45
            vis = cv2.addWeighted(vis, 1.0, red_overlay, alpha, 0)

        # 绘制网格方向箭头
        if (dir_x_map is not None and dir_y_map is not None and
                self.frame_idx % self.GRID_DRAW_EVERY == 0):
            self._draw_grid_arrows(vis, heat_map, dir_x_map, dir_y_map)

        # 绘制车辆轨迹和事件
        if track_hist is not None:
            self._draw_tracks_and_events(vis, track_hist, current_events, all_events)

        # 绘制检测框和方向
        if data.current_result is not None:
            self._draw_detections(vis, data.current_result, track_hist)

        # 添加调试信息
        self._draw_debug_info(vis)

        data.frame = vis
        return data

    def _draw_grid_arrows(self, vis, heat_map, dir_x_map, dir_y_map):
        """在网格上绘制方向箭头"""
        h, w = heat_map.shape
        for gy in range(0, h, self.GRID_STEP):
            for gx in range(0, w, self.GRID_STEP):
                x0, y0 = gx, gy
                x1 = min(gx + self.GRID_STEP, w)
                y1 = min(gy + self.GRID_STEP, h)

                win = heat_map[y0:y1, x0:x1]
                if win.size == 0:
                    continue

                avg_heat = float(win.mean())
                if avg_heat / self.MAX_HEAT >= self.GRID_HEAT_THRESHOLD:
                    avg_dx = float(dir_x_map[y0:y1, x0:x1].sum())
                    avg_dy = float(dir_y_map[y0:y1, x0:x1].sum())

                    if avg_dx == 0 and avg_dy == 0:
                        continue

                    cell_center = (x0 + (x1 - x0) // 2, y0 + (y1 - y0) // 2)
                    self._draw_arrow(
                        vis, cell_center,
                        (avg_dx * 5.0, avg_dy * 5.0),
                        color=(0, 128, 255), thickness=2
                    )

    def _draw_tracks_and_events(self, vis, track_hist, current_events, all_events):
        """绘制车辆轨迹和事件标签"""
        for tid, hist in track_hist.items():
            if len(hist) == 0:
                continue

            # 绘制轨迹线
            pts = np.array(hist, dtype=np.int32)
            for i in range(1, len(pts)):
                cv2.line(vis, tuple(pts[i - 1]), tuple(pts[i]), (255, 255, 255), 1)

            # 绘制当前位置
            cx, cy = hist[-1]
            cv2.circle(vis, (int(cx), int(cy)), 3, (255, 255, 255), -1)

            # 绘制当前事件
            if tid in current_events:
                event = current_events[tid]
                txt = f"id:{tid} {event}"
                cv2.putText(
                    vis, txt, (int(cx) + 6, int(cy) - 6),
                    cv2.FONT_HERSHEY_SIMPLEX, 0.5, (0, 0, 255), 2
                )
            # 绘制近期事件（过去5帧内）
            elif tid in all_events:
                last_frame_idx, event = all_events[tid]
                if event is not None and self.frame_idx - last_frame_idx <= 5:
                    txt = f"id:{tid} {event}"
                    cv2.putText(
                        vis, txt, (int(cx) + 6, int(cy) - 6),
                        cv2.FONT_HERSHEY_SIMPLEX, 0.5, (0, 0, 255), 2
                    )

    def _draw_detections(self, vis, result, track_hist):
        """绘制检测框和车辆方向"""
        boxes = getattr(result, "boxes", None)
        if boxes is None:
            return

        for box in boxes:
            try:
                xyxy = getattr(box, "xyxy", None)
                if xyxy is None:
                    continue

                x1, y1, x2, y2 = map(int, map(float, xyxy[0].tolist()))
                track_id = int(getattr(box, "id", -1))
                cls = int(getattr(box, "cls", -1))

                # 绘制检测框
                cv2.rectangle(vis, (x1, y1), (x2, y2), (0, 255, 255), 2)

                # 绘制车辆ID
                cx, cy = (x1 + x2) // 2, (y1 + y2) // 2
                cv2.putText(
                    vis, f"id:{track_id}", (cx + 6, cy - 6),
                    cv2.FONT_HERSHEY_SIMPLEX, 0.5, (255, 255, 255), 1
                )

                # 绘制车辆方向箭头
                if track_id in track_hist and len(track_hist[track_id]) >= 2:
                    hist = track_hist[track_id]
                    p0 = hist[-2]
                    p1 = hist[-1]
                    v = (p1[0] - p0[0], p1[1] - p0[1])
                    self._draw_arrow(
                        vis, (cx, cy), (v[0], v[1]),
                        color=(0, 0, 255), thickness=2
                    )

            except Exception:
                continue

    def _draw_arrow(self, img, start, vec, color=(0, 255, 0), thickness=2, tip_length=0.3):
        """绘制箭头"""
        sx, sy = int(round(start[0])), int(round(start[1]))
        vx, vy = float(vec[0]), float(vec[1])
        norm = math.hypot(vx, vy)

        if norm < 1e-3:
            return

        scale = 1.0
        if norm < self.ARROW_LEN_MIN:
            scale = self.ARROW_LEN_MIN / (norm + 1e-6)

        ex = int(round(sx + vx * scale))
        ey = int(round(sy + vy * scale))

        cv2.arrowedLine(
            img, (sx, sy), (ex, ey),
            color, thickness, tipLength=tip_length
        )

    def _draw_debug_info(self, vis):
        """绘制调试信息"""
        cv2.putText(
            vis, f"Frame:{self.frame_idx}", (10, 20),
            cv2.FONT_HERSHEY_SIMPLEX, 0.6, (200, 200, 200), 2
        )
        cv2.putText(
            vis, f"HeatMax:{self.MAX_HEAT} TrustThr:3.0", (10, 45),
            cv2.FONT_HERSHEY_SIMPLEX, 0.5, (200, 200, 200), 1
        )