手把手教程 | YOLOv8-seg训练自己的分割数据集-编程知识

🚀🚀🚀手把手教程：教会你如何使用自己的数据集开展分割任务

🚀🚀🚀YOLOv8-seg创新专栏：http://t.csdnimg.cn/KLSdv

学姐带你学习YOLOv8，从入门到创新，轻轻松松搞定科研；
1）手把手教你如何训练YOLOv8-seg；
2）模型创新，提升分割性能；
3）独家自研模块助力分割；

1.数据集介绍

番薯破损分割任务，自己手动标注，数据集大小304张

1.数据集标注

使用labelme进行数据集标注，首先进行labelme安装

pip install labelme

2.数据集格式转换

json to txt以及划分为train、val、test，适配yolov8-seg

2.1 json2txt.py

# -*- coding: utf-8 -*-
import json
import os
import argparse
from tqdm import tqdmdef convert_label_json(json_dir, save_dir, classes):json_paths = os.listdir(json_dir)classes = classes.split(',')for json_path in tqdm(json_paths):# for json_path in json_paths:path = os.path.join(json_dir, json_path)with open(path, 'r') as load_f:json_dict = json.load(load_f)h, w = json_dict['imageHeight'], json_dict['imageWidth']# save txt pathtxt_path = os.path.join(save_dir, json_path.replace('json', 'txt'))txt_file = open(txt_path, 'w')for shape_dict in json_dict['shapes']:label = shape_dict['label']label_index = classes.index(label)points = shape_dict['points']points_nor_list = []for point in points:points_nor_list.append(point[0] / w)points_nor_list.append(point[1] / h)points_nor_list = list(map(lambda x: str(x), points_nor_list))points_nor_str = ' '.join(points_nor_list)label_str = str(label_index) + ' ' + points_nor_str + '\n'txt_file.writelines(label_str)if __name__ == "__main__":"""python json2txt_nomalize.py --json-dir my_datasets/color_rings/jsons --save-dir my_datasets/color_rings/txts --classes "cat,dogs""""parser = argparse.ArgumentParser(description='json convert to txt params')parser.add_argument('--json-dir', type=str,default='F:/DL/Pytorch/yolov8/ultralytics-seg/data/skinning/json', help='json path dir')parser.add_argument('--save-dir', type=str,default='F:/DL/Pytorch/yolov8/ultralytics-seg/data/skinning/txt' ,help='txt save dir')parser.add_argument('--classes', type=str, default='skinning',help='classes')args = parser.parse_args()json_dir = args.json_dirsave_dir = args.save_dirclasses = args.classesconvert_label_json(json_dir, save_dir, classes)

2.2 划分为train、val、test

# 将图片和标注数据按比例切分为 训练集和测试集
import shutil
import random
import os
import argparse# 检查文件夹是否存在
def mkdir(path):if not os.path.exists(path):os.makedirs(path)def main(image_dir, txt_dir, save_dir):# 创建文件夹mkdir(save_dir)images_dir = os.path.join(save_dir, 'images')labels_dir = os.path.join(save_dir, 'labels')img_train_path = os.path.join(images_dir, 'train')img_test_path = os.path.join(images_dir, 'test')img_val_path = os.path.join(images_dir, 'val')label_train_path = os.path.join(labels_dir, 'train')label_test_path = os.path.join(labels_dir, 'test')label_val_path = os.path.join(labels_dir, 'val')mkdir(images_dir);mkdir(labels_dir);mkdir(img_train_path);mkdir(img_test_path);mkdir(img_val_path);mkdir(label_train_path);mkdir(label_test_path);mkdir(label_val_path);# 数据集划分比例，训练集75%，验证集15%，测试集15%，按需修改train_percent = 0.85val_percent = 0.15test_percent = 0total_txt = os.listdir(txt_dir)num_txt = len(total_txt)list_all_txt = range(num_txt)  # 范围 range(0, num)num_train = int(num_txt * train_percent)num_val = int(num_txt * val_percent)num_test = num_txt - num_train - num_valtrain = random.sample(list_all_txt, num_train)# 在全部数据集中取出trainval_test = [i for i in list_all_txt if not i in train]# 再从val_test取出num_val个元素，val_test剩下的元素就是testval = random.sample(val_test, num_val)print("训练集数目：{}, 验证集数目：{},测试集数目：{}".format(len(train), len(val), len(val_test) - len(val)))for i in list_all_txt:name = total_txt[i][:-4]srcImage = os.path.join(image_dir, name + '.jpg')srcLabel = os.path.join(txt_dir, name + '.txt')if i in train:dst_train_Image = os.path.join(img_train_path, name + '.jpg')dst_train_Label = os.path.join(label_train_path, name + '.txt')shutil.copyfile(srcImage, dst_train_Image)shutil.copyfile(srcLabel, dst_train_Label)elif i in val:dst_val_Image = os.path.join(img_val_path, name + '.jpg')dst_val_Label = os.path.join(label_val_path, name + '.txt')shutil.copyfile(srcImage, dst_val_Image)shutil.copyfile(srcLabel, dst_val_Label)else:dst_test_Image = os.path.join(img_test_path, name + '.jpg')dst_test_Label = os.path.join(label_test_path, name + '.txt')shutil.copyfile(srcImage, dst_test_Image)shutil.copyfile(srcLabel, dst_test_Label)if __name__ == '__main__':"""python split_datasets.py --image-dir my_datasets/color_rings/imgs --txt-dir my_datasets/color_rings/txts --save-dir my_datasets/color_rings/train_data"""parser = argparse.ArgumentParser(description='split datasets to train,val,test params')parser.add_argument('--image-dir', type=str,default='F:/DL/Pytorch/yolov8/ultralytics-seg/data/skinning/images', help='image path dir')parser.add_argument('--txt-dir', type=str,default='F:/DL/Pytorch/yolov8/ultralytics-seg/data/skinning/txt' , help='txt path dir')parser.add_argument('--save-dir', default='F:/DL/Pytorch/yolov8/ultralytics-seg/data/skinning/split', type=str, help='save dir')args = parser.parse_args()image_dir = args.image_dirtxt_dir = args.txt_dirsave_dir = args.save_dirmain(image_dir, txt_dir, save_dir)

3.如何训练yolov8-seg

3.1 skinning.yaml配置

# Train/val/test sets as 1) dir: path/to/imgs, 2) file: path/to/imgs.txt, or 3) list: [path/to/imgs1, path/to/imgs2, ..]
path: F:/DL/Pytorch/yolov8/ultralytics-seg/data/skinning/split  # dataset root dir
train: F:/DL/Pytorch/yolov8/ultralytics-seg/data/skinning/split/images/train  # train images (relative to 'path') 4 images
val: F:/DL/Pytorch/yolov8/ultralytics-seg/data/skinning/split/images/val  # val images (relative to 'path') 4 images
test:  # test images (optional)nc: 1# Classes
names:0: skinning

3.2 如何训练

from ultralytics.cfg import entrypoint
arg="yolo segment train model=yolov8-seg0.yaml data=ultralytics/cfg/datasets/skinning.yaml"entrypoint(arg)

3.3 yolov8-seg.yaml

# Ultralytics YOLO 🚀, AGPL-3.0 license
# YOLOv8-seg instance segmentation model. For Usage examples see https://docs.ultralytics.com/tasks/segment# Parameters
nc: 1  # number of classes
scales: # model compound scaling constants, i.e. 'model=yolov8n-seg.yaml' will call yolov8-seg.yaml with scale 'n'# [depth, width, max_channels]n: [0.33, 0.25, 1024]s: [0.33, 0.50, 1024]m: [0.67, 0.75, 768]l: [1.00, 1.00, 512]x: [1.00, 1.25, 512]# YOLOv8.0n backbone
backbone:# [from, repeats, module, args]- [-1, 1, Conv, [64, 3, 2]]  # 0-P1/2- [-1, 1, Conv, [128, 3, 2]]  # 1-P2/4- [-1, 3, C2f, [128, True]]- [-1, 1, Conv, [256, 3, 2]]  # 3-P3/8- [-1, 6, C2f, [256, True]]- [-1, 1, Conv, [512, 3, 2]]  # 5-P4/16- [-1, 6, C2f, [512, True]]- [-1, 1, Conv, [1024, 3, 2]]  # 7-P5/32- [-1, 3, C2f, [1024, True]]- [-1, 1, SPPF, [1024, 5]]  # 9# YOLOv8.0n head
head:- [-1, 1, nn.Upsample, [None, 2, 'nearest']]- [[-1, 6], 1, Concat, [1]]  # cat backbone P4- [-1, 3, C2f, [512]]  # 12- [-1, 1, nn.Upsample, [None, 2, 'nearest']]- [[-1, 4], 1, Concat, [1]]  # cat backbone P3- [-1, 3, C2f, [256]]  # 15 (P3/8-small)- [-1, 1, Conv, [256, 3, 2]]- [[-1, 12], 1, Concat, [1]]  # cat head P4- [-1, 3, C2f, [512]]  # 18 (P4/16-medium)- [-1, 1, Conv, [512, 3, 2]]- [[-1, 9], 1, Concat, [1]]  # cat head P5- [-1, 3, C2f, [1024]]  # 21 (P5/32-large)- [[15, 18, 21], 1, Segment, [nc, 32, 256]]  # Segment(P3, P4, P5)