1.下载crowdhuman数据集，下载链接如下：CrowdHuman Dataset
2.labels文件odgt格式json文件转换成coco数据格式，代码如下：
# corwdhuman->coco
import os
import json
from PIL import Image
def load_file(fpath):#fpath是具体的文件 ，作用：#str to list
assert os.path.exists(fpath) #assert() raise-if-not
with open(fpath,'r') as fid:
lines = fid.readlines()
records = [json.loads(line.strip('\n')) for line in lines] #str to list
return records
def crowdhuman2coco(odgt_path,json_path):#一个输入文件路径，一个输出文件路径
records = load_file(odgt_path) #提取odgt文件数据
#预处理
json_dict = {"images":[], "annotations": [], "categories": []}#定义一个字典，coco数据集标注格式
START_B_BOX_ID = 1 #设定框的起始ID
image_id = 1 #每个image的ID唯一，自己设定start，每次++
bbox_id = START_B_BOX_ID
image = {} #定义一个字典，记录image
annotation = {} #记录annotation
categories = {} #进行类别记录
record_list = len(records) #获得record的长度，循环遍历所有数据。
print(record_list)
#一行一行的处理。
for i in range(record_list):
file_name = records[i]['ID']+'.jpg' #这里是字符串格式 eg.273278,600e5000db6370fb
#image_id = int(records[i]['ID'].split(",")[0]) 这样会导致id唯一，要自己设定
im = Image.open("/media/ubuntu/work_space/data-human/crowdhuman/Images/"+file_name)
#根据文件名，获取图片，这样可以获取到图片的宽高等信息。因为再odgt数据集里，没有宽高的字段信息。
image = {'file_name': file_name, 'height': im.size[1], 'width': im.size[0],'id':image_id} #im.size[0]，im.size[1]分别是宽高
json_dict['images'].append(image) #这一步完成一行数据到字典images的转换。
gt_box = records[i]['gtboxes']
gt_box_len = len(gt_box) #每一个字典gtboxes里，也有好几个记录，分别提取记录。
for j in range(gt_box_len):
category = gt_box[j]['tag']
if category not in categories: #该类型不在categories，就添加上去
new_id = len(categories) + 1 #ID递增
categories[category] = new_id
category_id = categories[category] #重新获取它的类别ID
fbox = gt_box[j]['fbox'] #获得全身框
#对ignore进行处理，ignore有时在key：extra里，有时在key：head_attr里。属于互斥的。
ignore = 0 #下面key中都没有ignore时，就设为0，据观察，都存在，只是存在哪个字典里，需要判断一下
if "ignore" in gt_box[j]['head_attr']:
ignore = gt_box[j]['head_attr']['ignore']
if "ignore" in gt_box[j]['extra']:
ignore = gt_box[j]['extra']['ignore']
#对字典annotation进行设值。
annotation = {'area': fbox[2]*fbox[3], 'iscrowd': ignore, 'image_id': #添加hbox、vbox字段。
image_id, 'bbox':fbox, 'hbox':gt_box[j]['hbox'],'vbox':gt_box[j]['vbox'],
'category_id': category_id,'id': bbox_id,'ignore': ignore,'segmentation': []}
#area的值，暂且就是fbox的宽高相乘了，观察里面的数据，发现fbox[2]小、fbox[3]很大，刚好一个全身框的宽很小，高就很大。（猜测），不是的话，再自行修改
#segmentation怎么处理？博主自己也不知道，找不到对应的数据，这里就暂且不处理。
#hbox、vbox、ignore是添加上去的，以防有需要。
json_dict['annotations'].append(annotation)
bbox_id += 1 #框ID ++
image_id += 1 #这个image_id的递增操作，注意位置，博主一开始，放上面执行了，后面出了bug，自己可以理一下。
#annotations的转化结束。
#下面这一步，对所有数据，只需执行一次，也就是对categories里的类别进行统计。
for cate, cid in categories.items():
#dict.items()返回列表list的所有列表项，形如这样的二元组list：［(key,value),(key,value),...］
cat = {'supercategory': 'none', 'id': cid, 'name': cate}
json_dict['categories'].append(cat)
#到此，json_dict的转化全部完成，对于其他的key，
#因为没有用到（不访问），就不需要给他们空间，也不需要去处理，字典是按key访问的，如果自己需要就自己添加上去就行
json_fp = open(json_path, 'w')
json_str = json.dumps(json_dict) #写json文件。
json_fp.write(json_str)
json_fp.close()
if __name__ == '__main__':
json_dict = '/media/ubuntu/work_space/data-human/crowdhuman/train.json'
odge_path = '/media/ubuntu/work_space/data-human/crowdhuman/annotation_train.odgt'
crowdhuman2coco(odge_path,json_dict)3.coco数据格式转换yolo数据
"""
COCO 格式的数据集转化为 YOLO 格式的数据集
--json_path 输入的json文件路径
--save_path 保存的文件夹名字，默认为当前目录下的labels。
"""
import os
import json
from tqdm import tqdm
import argparse
parser = argparse.ArgumentParser()
parser.add_argument('--json_path', default='/media/ubuntu/work_space/data-human/crowdhuman/val.json',type=str, help="input: coco format(json)")
parser.add_argument('--save_path', default='/media/ubuntu/work_space/data-human/crowdhuman/labels/', type=str, help="specify where to save the output dir of labels")
arg = parser.parse_args()
#中心点坐标，长和宽（小数点形式）
def convert(size, box):
dw = 1. / (size[0])
dh = 1. / (size[1])
x = box[0] + box[2] / 2.0
y = box[1] + box[3] / 2.0
w = box[2]
h = box[3]
x = x * dw
w = w * dw
y = y * dh
h = h * dh
return (x, y, w, h)
if __name__ == '__main__':
json_file = arg.json_path # COCO Object Instance 类型的标注
ana_txt_save_path = arg.save_path # 保存的路径
data = json.load(open(json_file, 'r'))
if not os.path.exists(ana_txt_save_path):
os.makedirs(ana_txt_save_path)
id_map = {} # coco数据集的id不连续！根据自己需求顺序自定义输出每个类别的id
with open(os.path.join(ana_txt_save_path, 'classes.txt'), 'w') as f:
# 写入classes.txt
for i, category in enumerate(data['categories']):
f.write(f"{category['name']}\n")
id_map[category['id']] = category['id']-1
print("name={}, id={}".format(category['name'], category['id']))
print("id_map={}".format(id_map))
i = 0
for img in tqdm(data['images']):
filename = img["file_name"]
img_width = img["width"]
img_height = img["height"]
img_id = img["id"]
head, tail = os.path.splitext(filename)
ana_txt_name = head + ".txt" # 对应的txt名字，与jpg一致
f_txt = open(os.path.join(ana_txt_save_path, ana_txt_name), 'w')
for ann in data['annotations']:
# print("ann_type={}".format(type(ann)))
if ann == None:
# print("filename={}".format(filename))
continue
else:
if ann['image_id'] == img_id:
# print("i={}".format(i))
print("img_id is:",img_id)
box = convert((img_width, img_height), ann["bbox"])
print('****',id_map[ann["category_id"]])
f_txt.write("%s %s %s %s %s\n" % (id_map[ann["category_id"]], box[0], box[1], box[2], box[3]))
f_txt.close()
i = i + 1 4.通过步骤3,crowdhuman标签转换成了coco数据集，但是在标签文档中有个classes的txt文档，内容有两个标签：person和mask （person：0,mask：1）
For example txt containing:
0 0.4609375 0.2791666666 0.028125 0.0638888
0 0.5910156 0.6375000000 0.04140625 0.0916666
0 0.9058593 0.4722222222 0.04765625 0.0916666
5.清理yolo的txt标签文件，去掉mask，类别为1的标签去掉，代码如下：
import os
import shutil
import json
from tqdm import tqdm
txt_path = '/media/ubuntu/work_space/data-human/crowdhuman/train_labels/'
txt_list = os.listdir(txt_path)
for i in tqdm(txt_list):
txt_name = txt_path + i
lines = [l for l in open(txt_name,"r") if l.find("1",0,1) !=0]
fd = open(txt_name,"a")
fd.truncate(0)
j = 0
while True:
if j < len(lines):
fd.write(lines[j])
j += 1
else:
break
fd.close()6.darknet environment preparation
(1) Install darknet environment
(2) modify Makefile
GPU=1
CUDNN=1
OPENCV=1
(3) compile darknet
cd darknet
Make
7.data preparation
（1）generate train.txt file and test.txt
Run the following command in the terminal to generate train.txt
find /media/deepnorth/14b6945d-9936/head-doc/JPEGImages/ -name "*.jpg" > train.txt
train.txt contains the path of each images in the JPEGImages file
text.txt is the same method ,contains the path of each images in the JPEGImages file, as shown below:
8.train file preparation
Create a new folder named yolov7 under the darknet folder, including the following files
(1) Create file obj.data containing (where classes = number of objects), backup is the path where the model is saved :
classes= 1
train = yolov7/train.list
valid = yolov7/test.list
names = yolov7/obj.names
backup = backup/
(2)Create file obj.names with objects names – each in new line
here is:person
(3)Calculating the anchors of a dataset
execute the following command in the darknet directory
./darknet detector calc_anchors yolov7/yolov7.data -num_of_clusters 9 -width 640 -height 640
:可以省略
(4)modify yolov7.cfg
[yolo]
mask = 3,4,5
anchors = 12,16, 19,36, 40,28, 36,75, 76,55, 72,146, 142,110, 192,243, 459,401
classes=1
num=9
change line classes=1 to your number of objects in each of 3 [yolo]-layers
change [filters=255] to filters=(classes + 5)x3 in the 3 [convolutional] before each [yolo] layer
anchors are calculated from step （3）
9.Start training
./darknet detector train yolov7/obj.data yolov7/yolov7.cfg -dont_show -gpus 0,1,2,3
(Optional) Resume training after interruption
./darknet detector train yolov7/obj.data yolov7/yolov7.cfg /backup/yolov3-tiny_1000.weights -gpus 0,1,2,3
(Optional) drawing of chart of average-Loss and accuracy-mAP (-map flag) during training
./darknet detector train yolov7/obj.data yolov7/yolov7.cfg -dont_show -mjpeg_port 8090 -map
When the training is completed, we will see that many models are saved under the path corresponding to backup, as shown in the following figure.
10.Test
（1）Test image
./darknet detector test yolov7/obj.data yolov7/yolov7.cfg yolov7.weight imgtest.jpg
(2) Test video
./darknet detector demo yolov7/obj.data yolov7/yolov7.cfg yolov7.weight <video file>
(3) Check accuracy mAP@IoU=0.5:
./darknet detector map yolov7/obj.data yolov7/yolov7.cfg yolov7.weight -iou_thresh 0.5
11.Model selection
Method 1: When -map flag is added to the training command line, you will get the following chart. Select the model with the highest map value as the final model.
Method 2: Calculate the map through step5, and then select the model with the highest map as the final model.
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