File size: 4,908 Bytes
3972fea | 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 | """Text, panels and the pose skeleton overlay."""
from __future__ import annotations
from functools import lru_cache
from pathlib import Path
import cv2
import numpy as np
from PIL import Image, ImageDraw, ImageFont
from pose import FACE, KEYPOINT_NAMES, SKELETON
_FONT_CANDIDATES = (
"/System/Library/Fonts/Supplemental/Arial.ttf",
"/System/Library/Fonts/Supplemental/Arial Unicode.ttf",
"/System/Library/Fonts/HelveticaNeue.ttc",
"/usr/share/fonts/truetype/dejavu/DejaVuSans.ttf",
"C:/Windows/Fonts/arial.ttf",
)
_POSE_LIMB = (255, 210, 90)
_POSE_FACE = (190, 240, 170)
_POSE_JOINT = (255, 255, 255)
_POSE_WEAK = (110, 90, 90)
@lru_cache(maxsize=1)
def _font_path() -> str | None:
"""Find available font."""
for p in _FONT_CANDIDATES:
if Path(p).exists():
return p
return None
@lru_cache(maxsize=8)
def _font(size: int) -> ImageFont.FreeTypeFont | ImageFont.ImageFont:
"""Load font at size."""
path = _font_path()
if path is None:
return ImageFont.load_default()
return ImageFont.truetype(path, size)
@lru_cache(maxsize=256)
def _render_text(text: str, size: int,
color: tuple[int, int, int]) -> tuple[np.ndarray, np.ndarray]:
"""Rasterize and cache text."""
font = _font(size)
dummy = ImageDraw.Draw(Image.new("L", (1, 1)))
box = dummy.textbbox((0, 0), text, font=font)
w = max(1, box[2] - box[0] + 4)
h = max(1, box[3] - box[1] + 4)
img = Image.new("L", (w, h), 0)
ImageDraw.Draw(img).text((2 - box[0], 2 - box[1]), text, font=font, fill=255)
alpha = np.array(img, dtype=np.float32) / 255.0
rgb = np.zeros((h, w, 3), dtype=np.float32)
rgb[:, :] = color
return rgb, alpha
def put_text(frame: np.ndarray, text: str, org: tuple[int, int], size: int = 18,
color: tuple[int, int, int] = (240, 240, 240)) -> int:
"""Draw text string."""
if not text:
return size + 6
rgb, alpha = _render_text(text, size, color)
h, w = alpha.shape
x, y = org
fh, fw = frame.shape[:2]
if x >= fw or y >= fh:
return h
x0, y0 = max(0, x), max(0, y)
x1, y1 = min(fw, x + w), min(fh, y + h)
if x1 <= x0 or y1 <= y0:
return h
sub_a = alpha[y0 - y:y1 - y, x0 - x:x1 - x][:, :, None]
sub_c = rgb[y0 - y:y1 - y, x0 - x:x1 - x]
roi = frame[y0:y1, x0:x1].astype(np.float32)
frame[y0:y1, x0:x1] = (roi * (1 - sub_a) + sub_c * sub_a).astype(np.uint8)
return h
def panel(frame: np.ndarray, x: int, y: int, w: int, h: int, alpha: float = 0.55) -> None:
"""Dark translucent backing."""
fh, fw = frame.shape[:2]
x0, y0 = max(0, x), max(0, y)
x1, y1 = min(fw, x + w), min(fh, y + h)
if x1 <= x0 or y1 <= y0:
return
roi = frame[y0:y1, x0:x1]
dark = np.zeros_like(roi)
cv2.addWeighted(dark, alpha, roi, 1 - alpha, 0, roi)
def draw_pose(frame: np.ndarray, pose, threshold: float = 0.35,
labels: bool = False) -> None:
"""Draw one body skeleton with its keypoints."""
kp = pose.keypoints
ok = pose.scores >= threshold
# Scale the strokes with the frame so the skeleton stays readable when the
# camera view is shrunk into a corner inset.
k = max(frame.shape[1] / 1280.0, 0.35)
thin = max(int(round(2 * k)), 1)
halo = thin + max(int(round(3 * k)), 2)
for a, b in SKELETON:
pa, pb = tuple(kp[a].astype(int)), tuple(kp[b].astype(int))
if ok[a] and ok[b]:
color = _POSE_FACE if (a in FACE and b in FACE) else _POSE_LIMB
cv2.line(frame, pa, pb, (25, 25, 30), halo, cv2.LINE_AA)
cv2.line(frame, pa, pb, color, thin, cv2.LINE_AA)
elif ok[a] or ok[b]:
cv2.line(frame, pa, pb, _POSE_WEAK, max(thin - 1, 1), cv2.LINE_AA)
for i in range(len(kp)):
p = tuple(kp[i].astype(int))
if not ok[i]:
cv2.circle(frame, p, max(int(round(2 * k)), 1), _POSE_WEAK, -1, cv2.LINE_AA)
continue
radius = max(int(round((3 if i in FACE else 5) * k)), 2)
cv2.circle(frame, p, radius + max(int(round(2 * k)), 1), (25, 25, 30), -1, cv2.LINE_AA)
cv2.circle(frame, p, radius, _POSE_JOINT, -1, cv2.LINE_AA)
if labels and i not in FACE:
put_text(frame, KEYPOINT_NAMES[i], (p[0] + 8, p[1] - 8), 13, (200, 230, 255))
def draw_help(frame: np.ndarray, lines: tuple[str, ...]) -> None:
"""Draw help overlay."""
h, w = frame.shape[:2]
bw, bh = min(w - 60, 720), 20 + len(lines) * 26
x, y = (w - bw) // 2, (h - bh) // 2
panel(frame, x, y, bw, bh, 0.78)
cv2.rectangle(frame, (x, y), (x + bw, y + bh), (90, 90, 90), 1, cv2.LINE_AA)
cy = y + 12
for line in lines:
bold = line and not line.startswith(" ")
put_text(frame, line, (x + 22, cy), 17 if bold else 16,
(255, 255, 255) if bold else (215, 215, 215))
cy += 26
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