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手把手教你用Python和OpenCV搭建一个半自动标注工具(详细步骤 + 源码)

  • 2026-08-18 23:11:38
手把手教你用Python和OpenCV搭建一个半自动标注工具(详细步骤 + 源码)

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    本文将手把手教你用Python和OpenCV搭建一个半自动标注工具(包含详细步骤 + 源码)。

背景介绍

    样本标注是深度学习项目中最关键的部分,甚至在模型学习效果上起决定性作用。但是,标注工作往往非常繁琐且耗时。一种解决方案是使用自动图像标注工具,它可以大大减少标注的时间。
    本文主要介绍的半自动标注工具为pyOpenAnnotate,此工具是基于Python和OpenCV实现,最新版本为0.4.0,可通过下面指令安装使用:
pip install pyOpenAnnotate
    详细介绍与使用步骤参考链接:
https://pypi.org/project/pyOpenAnnotate/

    标注效果:

效果如上图所示,标注完成后可以生成标注文件,后面部分将详细介绍其实现步骤。

实现步骤

    实现原理流程:

说明:
   【1】Threshold(二值化)只接受单通道图像,但这里并不是直接使用灰度转换图来处理,而是从灰度图、R、G、B、H、S、V通道图像中找到对比度最高的图像来做二值化。
   【2】二化之后并不能保证总是得到我们需要的掩码,有时会有噪声、斑点、边缘的干扰,所以加入了膨胀、腐蚀等形态学处理。
   【3】最后通过轮廓分析得到对象的边界框,也就是左上角和右下角坐标。

代码讲解与演示

    首先需要导入所需库:

import cv2import numpy as npimport matplotlib.pyplot as pltplt.rcParams['image.cmap'] = 'gray'

    加载图像:

stags = cv2.imread('stags.jpg')boars = cv2.imread('boar.jpg')berries = cv2.imread('strawberries.jpg')fishes = cv2.imread('fishes.jpg')coins = cv2.imread('coins.png')boxes = cv2.imread('boxes2.jpg')
    选择色彩空间(这里添加了 RGB和HSV,存储在字典中,方便验证使用):
def select_colorsp(img, colorsp='gray'):    # Convert to grayscale.    gray = cv2.cvtColor(img, cv2.COLOR_BGR2GRAY)    # Split BGR.    red, green, blue = cv2.split(img)    # Convert to HSV.    im_hsv = cv2.cvtColor(img, cv2.COLOR_BGR2HSV)    # Split HSV.    hue, sat, val = cv2.split(im_hsv)    # Store channels in a dict.    channels = {'gray':gray'red':red'green':green                'blue':blue'hue':hue'sat':sat'val':val}    return channels[colorsp]

    显示 1×2 图像的实用函数(display()函数接受两个图像并并排绘制。可选参数是绘图的标题和图形大小):

def display(im_left, im_right, name_l='Left', name_r='Right', figsize=(10,7)):    # Flip channels for display if RGB as matplotlib requires RGB.    im_l_dis = im_left[...,::-1]  if len(im_left.shape) > 2 else im_left    im_r_dis = im_right[...,::-1if len(im_right.shape) > 2 else im_right    plt.figure(figsize=figsize)    plt.subplot(121); plt.imshow(im_l_dis);    plt.title(name_l); plt.axis(False);    plt.subplot(122); plt.imshow(im_r_dis);    plt.title(name_r); plt.axis(False);

    阈值处理(thresh()函数接受1通道灰度图像,默认阈值设置为 127。执行逆阈值处理,便轮廓分析,它返回单通道阈值图像):

def threshold(img, thresh=127, mode='inverse'):    im = img.copy()    if mode == 'direct':        thresh_mode = cv2.THRESH_BINARY    else:        thresh_mode = cv2.THRESH_BINARY_INV    ret, thresh = cv2.threshold(im, thresh, 255, thresh_mode)    return thresh

实例:雄鹿红外图像标注

    整体实现步骤:

  【1】选择色彩空间

# Select colorspace.gray_stags = select_colorsp(stags)# Perform thresholding.thresh_stags = threshold(gray_stags, thresh=110)# Display.display(stags, thresh_stags,         name_l='Stags original infrared',         name_r='Thresholded Stags',        figsize=(20,14))

  【2执行阈值

  【3】执行形态学操作

def morph_op(img, mode='open', ksize=5, iterations=1):    im = img.copy()    kernel = cv2.getStructuringElement(cv2.MORPH_ELLIPSE,(ksize, ksize))    if mode == 'open':        morphed = cv2.morphologyEx(im, cv2.MORPH_OPEN, kernel)    elif mode == 'close':        morphed = cv2.morphologyEx(im, cv2.MORPH_CLOSE, kernel)    elif mode == 'erode':        morphed = cv2.erode(im, kernel)    else:        morphed = cv2.dilate(im, kernel)    return morphed
# Perform morphological operation.morphed_stags = morph_op(thresh_stags)# Display.display(thresh_stags, morphed_stags,         name_l='Thresholded Stags'        name_r='Morphological Operations Result',        figsize=(20,14))

  【4轮廓分析以找到边界框

bboxes = get_bboxes(morphed_stags)ann_morphed_stags = draw_annotations(stags, bboxes, thickness=5, color=(0,0,255))# Display.display(ann_stags, ann_morphed_stags,         name_l='Annotating Thresholded Stags',         name_r='Annotating Morphed Stags',        figsize=(20,14))

  【5】滤不需要的轮廓

def get_filtered_bboxes(img, min_area_ratio=0.001):    contours, hierarchy = cv2.findContours(img, cv2.RETR_LIST, cv2.CHAIN_APPROX_SIMPLE)    # Sort the contours according to area, larger to smaller.    sorted_cnt = sorted(contours, key=cv2.contourArea, reverse = True)    # Remove max area, outermost contour.    sorted_cnt.remove(sorted_cnt[0])    # Container to store filtered bboxes.    bboxes = []    # Image area.    im_area = img.shape[0] * img.shape[1]    for cnt in sorted_cnt:        x,y,w,h = cv2.boundingRect(cnt)        cnt_area = w * h        # Remove very small detections.        if cnt_area > min_area_ratio * im_area:            bboxes.append((x, y, x+w, y+h))    return bboxes

  【6绘制边界框

bboxes = get_filtered_bboxes(thresh_stags, min_area_ratio=0.001)filtered_ann_stags = draw_annotations(stags, bboxes, thickness=5, color=(0,0,255))# Display.display(ann_stags, filtered_ann_stags,         name_l='Annotating Thresholded Stags',         name_r='Annotation After Filtering Smaller Boxes',        figsize=(20,14))

视频标注:

【7需要的格式保存

    Pascal VOC、YOLO和COCO 是对象检测中使用的三种流行注释格式。让我们研究一下它们的结构。

I. Pascal VOC 以 XML 格式存储注释

II. YOLO标注结果保存在文本文件中。对于每个边界框,它看起来如下所示。这些值相对于图像的高度和宽度进行了归一化。

0 0.0123 0.2345 0.123 0.754
<object-class> <x_centre_norm> <y_centre_norm> <box_width_norm> <box_height_norm>

    让边界框的左上角和右下角坐标表示为(x1, y1)和(x2, y2)。然后:

    III. MS COCO

    这里以YOLO Darknet保存格式为例(当然,你可以保存其他格式):

def save_annotations(img, bboxes):    img_height = img.shape[0]    img_width = img.shape[1]    with open('image.txt''w'as f:        for box in boxes:            x1, y1 = box[0], box[1]            x2, y2 = box[2], box[3]            if x1 > x2:                x1, x2 = x2, x1            if y1 > y2:                y1, y2 = y2, y1            width = x2 - x1            height = y2 - y1            x_centre, y_centre = int(width/2), int(height/2)            norm_xc = x_centre/img_width            norm_yc = y_centre/img_height            norm_width = width/img_width            norm_height = height/img_height            yolo_annotations = ['0'' ' + str(norm_xc),                                 ' ' + str(norm_yc),                                 ' ' + str(norm_width),                                 ' ' + str(norm_height), '\n']            f.writelines(yolo_annotations)

    标注结果显示与保存:

    简单演示:

—THE END—
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  1. CONNECT:[ UseTime:0.000798s ] mysql:host=127.0.0.1;port=3306;dbname=f_mffb;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.001285s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.001469s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.013241s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.001950s ]
  6. SELECT * FROM `set` [ RunTime:0.001055s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.002022s ]
  8. SELECT * FROM `article` WHERE `id` = 508436 LIMIT 1 [ RunTime:0.076461s ]
  9. UPDATE `article` SET `lasttime` = 1787290599 WHERE `id` = 508436 [ RunTime:0.009012s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 66 LIMIT 1 [ RunTime:0.000289s ]
  11. SELECT * FROM `article` WHERE `id` < 508436 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000535s ]
  12. SELECT * FROM `article` WHERE `id` > 508436 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.002131s ]
  13. SELECT * FROM `article` WHERE `id` < 508436 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.009113s ]
  14. SELECT * FROM `article` WHERE `id` < 508436 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.000756s ]
  15. SELECT * FROM `article` WHERE `id` < 508436 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.014373s ]
0.212995s