真没怎么看懂YOLOv5的detect.py代码的逻辑，看了YOLOv3，和YOLOv4的detect逻辑，基本都是用opencv对每个视频进行操作，感觉还清晰易懂一点，YOLOv5的作者都好像没用opencv进行操作，或者把opencv的视频操作封装成另一个py文件隐藏起来，实在有些隐晦，所以用了最笨的方法，用os.listdir读视频文件目录下的所有视频，逐一检测。同时改写了画框的函数(因为要保存一帧关键帧的内容)，检测命令里是用python detect.py –exist-ok –nosave，因为检测命令里带nosave这一选项，所以浅扒了一下作者的画框逻辑，发现还是用的opencv的rectangle方法(作者藏的

import numpy as np
import argparse
import os
import sys
from pathlib import Path
import time
import shutil
from PIL import Image
import cv2
import torch
import torch.backends.cudnn as cudnn

FILE = Path(file).resolve()
ROOT = FILE.parents[0] # YOLOv5 root directory
if str(ROOT) not in sys.path:
sys.path.append(str(ROOT)) # add ROOT to PATH
ROOT = Path(os.path.relpath(ROOT, Path.cwd())) # relative

from models.common import DetectMultiBackend
from utils.datasets import IMG_FORMATS, VID_FORMATS, LoadImages, LoadStreams
from utils.general import (LOGGER, check_file, check_img_size, check_imshow, check_requirements, colorstr,
increment_path, non_max_suppression, print_args, scale_coords, strip_optimizer, xyxy2xywh)
from utils.plots import Annotator, colors, save_one_box
from utils.torch_utils import select_device, time_sync

@torch.no_grad()
def run(weights=ROOT / ‘yolov5s.pt’, # model.pt path(s)
vidpath=’/home/ccf_disk/animal/test/’, # file/dir/URL/glob, 0 for webcam
data=ROOT / ‘data/coco128.yaml’, # dataset.yaml path
imgsz=(640, 640), # inference size (height, width)
conf_thres=0.6, # confidence threshold
iou_thres=0.45, # NMS IOU threshold
max_det=1000, # maximum detections per image
device=”, # cuda device, i.e. 0 or 0,1,2,3 or cpu
view_img=False, # show results
save_txt=False, # save results to *.txt
save_conf=False, # save confidences in –save-txt labels
save_crop=False, # save cropped prediction boxes
nosave=True, # do not save images/videos
classes=None, # filter by class: –class 0, or –class 0 2 3
agnostic_nms=False, # class-agnostic NMS
augment=False, # augmented inference
visualize=False, # visualize features
update=False, # update all models
project=’/home/ccf_disk/animal/video_animal’, # save results to project/name
name=’test_1′, # save results to project/name
exist_ok=True, # existing project/name ok, do not increment
line_thickness=3, # bounding box thickness (pixels)
hide_labels=False, # hide labels
hide_conf=False, # hide confidences
half=False, # use FP16 half-precision inference
dnn=False, # use OpenCV DNN for ONNX inference
):
vidpath = str(vidpath)
videos = os.listdir(vidpath)
number = 0
for video_name in videos:
time1_start = time.time()
so = vidpath + video_name
number = number + 1
print(“第%d个视频处理中” %number)
source = str(so)
save_c = 0
keep = 0
save_img = not nosave and not source.endswith(‘.txt’) # save inference images
is_file = Path(source).suffix[1:] in (IMG_FORMATS + VID_FORMATS)
is_url = source.lower().startswith((‘rtsp://’, ‘rtmp://’, ‘http://’, ‘https://’))
webcam = source.isnumeric() or source.endswith(‘.txt’) or (is_url and not is_file)
if is_url and is_file:
source = check_file(source) # download

Directories
save_dir = increment_path(Path(project) / name, exist_ok=exist_ok) # increment run
(save_dir / ‘labels’ if save_txt else save_dir).mkdir(parents=True, exist_ok=True) # make dir

Load model
device = select_device(device)
model = DetectMultiBackend(weights, device=device, dnn=dnn, data=data)
stride, names, pt, jit, onnx, engine = model.stride, model.names, model.pt, model.jit, model.onnx, model.engine
imgsz = check_img_size(imgsz, s=stride) # check image size

Half
half &= (pt or jit or onnx or engine) and device.type != ‘cpu’ # FP16 supported on limited backends with CUDA
if pt or jit:
model.model.half() if half else model.model.float()

Dataloader
if webcam:
view_img = check_imshow()
cudnn.benchmark = True # set True to speed up constant image size inference
dataset = LoadStreams(source, img_size=imgsz, stride=stride, auto=pt)
bs = len(dataset) # batch_size
else:
dataset = LoadImages(source, img_size=imgsz, stride=stride, auto=pt)
bs = 1 # batch_size
vid_path, vid_writer = [None] * bs, [None] * bs

Run inference
model.warmup(imgsz=(1 if pt else bs, 3, *imgsz), half=half) # warmup
dt, seen = [0.0, 0.0, 0.0], 0
for path, im, im0s, vid_cap, s in dataset:
flag = 0
c = 1
time1 = 6
t1 = time_sync()
im = torch.from_numpy(im).to(device)
im = im.half() if half else im.float() # uint8 to fp16/32
im /= 255 # 0 – 255 to 0.0 – 1.0
if len(im.shape) == 3:
im = im[None] # expand for batch dim
t2 = time_sync()
dt[0] += t2 – t1

Inference

visualize = increment_path(save_dir / Path(path).stem, mkdir=True) if visualize else False
pred = model(im, augment=augment, visualize=visualize)
t3 = time_sync()
dt[1] += t3 – t2

NMS
pred = non_max_suppression(pred, conf_thres, iou_thres, classes, agnostic_nms, max_det=max_det)

dt[2] += time_sync() – t3

Second-stage classifier (optional)
pred = utils.general.apply_classifier(pred, classifier_model, im, im0s)

Process predictions
for i, det in enumerate(pred): # per image
seen += 1
count = 0
if webcam: # batch_size >= 1
p, im0, frame = path[i], im0s[i].copy(), dataset.count
s += f'{i}: ‘
else:
p, im0, frame = path, im0s.copy(), getattr(dataset, ‘frame’, 0)

p = Path(p) # to Path
save_path = str(save_dir / p.name) # im.jpg
txt_path = str(save_dir / ‘labels’ / p.stem) + (
” if dataset.mode == ‘image’ else f’_{frame}’) # im.txt
s += ‘%gx%g ‘ % im.shape[2:] # print string
gn = torch.tensor(im0.shape)[[1, 0, 1, 0]] # normalization gain whwh
imc = im0.copy() if save_crop else im0 # for save_crop
annotator = Annotator(im0, line_width=line_thickness, example=str(names))
if len(det):
Rescale boxes from img_size to im0 size
det[:, :4] = scale_coords(im.shape[2:], det[:, :4], im0.shape).round()

Print results
for c in det[:, -1].unique():
n = (det[:, -1] == c).sum() # detections per class
s += f”{n} {names[int(c)]}{‘s’ * (n > 1)}, ” # add to string

Write results
for xyxy, conf, cls in reversed(det):
count = 1
if save_txt: # Write to file
xywh = (xyxy2xywh(torch.tensor(xyxy).view(1, 4)) / gn).view(-1).tolist() # normalized xywh
line = (cls, xywh, conf) if save_conf else (cls, *xywh) # label format
with open(txt_path + ‘.txt’, ‘a’) as f:
f.write((‘%g ‘ * len(line)).rstrip() % line + ‘\n’)

if save_img or save_crop or view_img: # Add bbox to image
c = int(cls) # integer class
label = None if hide_labels else (names[c] if hide_conf else f'{names[c]} {conf:.2f}’)
annotator.box_label(xyxy, label, color=colors(c, True))
if save_crop:
save_one_box(xyxy, imc, file=save_dir / ‘crops’ / names[c] / f'{p.stem}.jpg’, BGR=True)
box = xyxy
c = int(cls) # integer class
p1, p2 = (int(box[0]), int(box[1])), (int(box[2]), int(box[3]))
lw = max(round(sum(im0.shape) / 2 * 0.003), 2)
cv2.rectangle(im0, p1, p2, color=(0, 0, 255),
thickness=max(round(sum(im0.shape) / 2 * 0.003), 2), lineType=cv2.LINE_AA)
label = (f'{names[c]} {conf:.2f}’)
tf = max(lw – 1, 1)
w, h = cv2.getTextSize(label, 0, fontScale=lw / 3, thickness=tf)[0] # text width, height
outside = p1[1] – h – 3 >= 0 # label fits outside box
cv2.putText(im0, label, (p1[0], p1[1] – 2 if outside else p1[1] + h + 2), 0, lw / 3,
(0, 0, 255),
thickness=tf, lineType=cv2.LINE_AA)

Stream results
im0 = annotator.result()
if view_img:
cv2.imshow(str(p), im0)
cv2.waitKey(1) # 1 millisecond
if (seen % time1 == 0):
if (count == 0):
save_c = 0
else:
save_c = save_c + 1
if(save_c>=4):
if keep == 0:
im0 = cv2.cvtColor(im0, cv2.COLOR_BGR2RGB)
frame = Image.fromarray(np.uint8(im0))

print(save_path)

frame.save(str(save_path.split(‘.’)[0]) + “.jpg”)
keep = 1
shutil.copy(so, save_path)
print(‘have animal’)
break
else:
continue
break

Save results (image with detections)

if save_img:
if dataset.mode == ‘image’:
cv2.imwrite(save_path, im0)
else: # ‘video’ or ‘stream’
if vid_path[i] != save_path: # new video
vid_path[i] = save_path
if isinstance(vid_writer[i], cv2.VideoWriter):
vid_writer[i].release() # release previous video writer
if vid_cap: # video
fps = vid_cap.get(cv2.CAP_PROP_FPS)
w = int(vid_cap.get(cv2.CAP_PROP_FRAME_WIDTH))
h = int(vid_cap.get(cv2.CAP_PROP_FRAME_HEIGHT))
else: # stream
fps, w, h = 30, im0.shape[1], im0.shape[0]
save_path = str(Path(save_path).with_suffix(‘.mp4’)) # force .mp4 suffix on results videos
vid_writer[i] = cv2.VideoWriter(save_path, cv2.VideoWriter_fourcc(‘mp4v’), fps, (w, h))
vid_writer[i].write(im0)

Print time (inference-only)
LOGGER.info(f'{s}Done. ({t3 – t2:.3f}s)’)

Print results
t = tuple(x / seen * 1E3 for x in dt) # speeds per image
LOGGER.info(f’Speed: %.1fms pre-process, %.1fms inference, %.1fms NMS per image at shape {(1, 3, imgsz)}’ % t)
if save_txt or save_img:
s = f”\n{len(list(save_dir.glob(‘labels/.txt’)))} labels saved to {save_dir / ‘labels’}” if save_txt else ”
LOGGER.info(f”Results saved to {colorstr(‘bold’, save_dir)}{s}”)
if update:
strip_optimizer(weights) # update model (to fix SourceChangeWarning)

time1_end = time.time()
print(‘视频%d处理时间’ % number + str(time1_end-time1_start))
if bool == True:
shutil.copy(so, save_path)
else:
pass

def parse_opt():
parser = argparse.ArgumentParser()
parser.add_argument(‘–weights’, nargs=’+’, type=str, default=ROOT / ‘weights/best.pt’, help=’model path(s)’)
parser.add_argument(‘–vidpath’, type=str, default=’/home/ccf_disk/animal/video/4-3/’,
help=’file/dir/URL/glob, 0 for webcam’)
parser.add_argument(‘–data’, type=str, default=ROOT / ‘data/myvoc.yaml’, help='(optional) dataset.yaml path’)
parser.add_argument(‘–imgsz’, ‘–img’, ‘–img-size’, nargs=’+’, type=int, default=[640], help=’inference size h,w’)
parser.add_argument(‘–conf-thres’, type=float, default=0.75, help=’confidence threshold’)
parser.add_argument(‘–iou-thres’, type=float, default=0.45, help=’NMS IoU threshold’)
parser.add_argument(‘–max-det’, type=int, default=1000, help=’maximum detections per image’)
parser.add_argument(‘–device’, default=”, help=’cuda device, i.e. 0 or 0,1,2,3 or cpu’)
parser.add_argument(‘–view-img’, action=’store_true’, help=’show results’)
parser.add_argument(‘–save-txt’, action=’store_true’, help=’save results to .txt’)
parser.add_argument(‘–save-conf’, action=’store_true’, help=’save confidences in –save-txt labels’)
parser.add_argument(‘–save-crop’, action=’store_true’, help=’save cropped prediction boxes’)
parser.add_argument(‘–nosave’, action=’store_true’, help=’do not save images/videos’)
parser.add_argument(‘–classes’, nargs=’+’, type=int, help=’filter by class: –classes 0, or –classes 0 2 3′)
parser.add_argument(‘–agnostic-nms’, action=’store_true’, help=’class-agnostic NMS’)
parser.add_argument(‘–augment’, action=’store_true’, help=’augmented inference’)
parser.add_argument(‘–visualize’, action=’store_true’, help=’visualize features’)
parser.add_argument(‘–update’, action=’store_true’, help=’update all models’)
parser.add_argument(‘–project’, default=’/home/ccf_disk/animal/video_animal_yolov5/’, help=’save results to project/name’)
parser.add_argument(‘–name’, default=’4-3′, help=’save results to project/name’)
parser.add_argument(‘–exist-ok’, action=’store_true’, help=’existing project/name ok, do not increment’)
parser.add_argument(‘–line-thickness’, default=3, type=int, help=’bounding box thickness (pixels)’)
parser.add_argument(‘–hide-labels’, default=False, action=’store_true’, help=’hide labels’)
parser.add_argument(‘–hide-conf’, default=False, action=’store_true’, help=’hide confidences’)
parser.add_argument(‘–half’, action=’store_true’, help=’use FP16 half-precision inference’)
parser.add_argument(‘–dnn’, action=’store_true’, help=’use OpenCV DNN for ONNX inference’)
opt = parser.parse_args()
opt.imgsz = 2 if len(opt.imgsz) == 1 else 1 # expand
print_args(FILE.stem, opt)
return opt

def main(opt):
check_requirements(exclude=(‘tensorboard’, ‘thop’))
run(**vars(opt))

if name == “main“:
opt = parse_opt()
main(opt)

有点深)，第一次发博客，浅记录一下。

Original: https://blog.csdn.net/Xiashawuyanzu/article/details/126310868
Author: Xiashawuyanzu
Title: 修改YOLOv5 detect.py代码使其能逐个视频检测保存，同时对每个视频内参数进行单独操作