逐一显示landmark dataset所有图片的标注

悠悠 2022-08-28 12:59 161阅读 0赞

本文解释如何显示WIDER数据集及显示相关标注。

如何显示coco数据集的图片及查看标注的质量请参考前面的文章《保存coco dataset注释为单一文件，并逐一显示所有图片的mask》。

根据libfacedetection.train([https://github.com/ShiqiYu/libfacedetection.train][https_github.com_ShiqiYu_libfacedetection.train])的数据结构，我们看一下其中的标注trainset.json的效果，

$ tree data/widerface  
data/widerface  
├── eval\_tools  
├── wider\_face\_split  
├── WIDER\_test  
├── WIDER\_train  
├── WIDER\_val  
└── trainset.json

文件trainset.json 比较大，直接打开要好久，我摘录几条看一下格式

{"images": 
    [
    {"file_name": "./44--Aerobics/44_Aerobics_Aerobics_44_53.jpg", "height": 683, "width": 1024, "id": 0},
    {"file_name": "./44--Aerobics/44_Aerobics_Aerobics_44_28.jpg", "height": 736, "width": 1024, "id": 1}, 
    {"file_name": "./44--Aerobics/44_Aerobics_Aerobics_44_591.jpg", "height": 936, "width": 1024, "id": 2}, 
    {"file_name": "./44--Aerobics/44_Aerobics_Aerobics_44_46.jpg", "height": 520, "width": 1024, "id": 3}, 
    {"file_name": "./44--Aerobics/44_Aerobics_Aerobics_44_321.jpg", "height": 1392, "width": 1024, "id": 4}, 
    {"file_name": "./44--Aerobics/44_Aerobics_Aerobics_44_946.jpg", "height": 1001, "width": 1024, "id": 5}, 
    {"file_name": "./44--Aerobics/44_Aerobics_Aerobics_44_307.jpg", "height": 1139, "width": 1024, "id": 6}, 
    {"file_name": "./44--Aerobics/44_Aerobics_Aerobics_44_943.jpg", "height": 1156, "width": 1024, "id": 7},
    {"file_name": "./44--Aerobics/44_Aerobics_Aerobics_44_711.jpg", "height": 1656, "width": 1024, "id": 8},
    ...
    {"file_name": "./27--Spa/27_Spa_Spa_27_110.jpg", "height": 307, "width": 1024, "id": 12860}, 
    {"file_name": "./27--Spa/27_Spa_Spa_27_879.jpg", "height": 1024, "width": 1024, "id": 12861}, 
    {"file_name": "./27--Spa/27_Spa_Spa_27_219.jpg", "height": 682, "width": 1024, "id": 12862}], 
    "annotations": 
    [
    {"segmentation": [[421.1, 133.2, 445.5, 125.5, 432.6, 145.4, 432.3, 159.9, 450.6, 153.4]], "area": 4356.76, "iscrowd": 0, "image_id": 0, "bbox": [411.5, 100.1, 59.6, 73.1], "category_id": 1, "id": 0, "ignore": 0}, 
    {"segmentation": [[537.6, 120.5, 546.8, 119.1, 541.2, 125.2, 539.9, 130.7, 547.1, 129.5]], "area": 585.66, "iscrowd": 0, "image_id": 0, "bbox": [534.4, 110.9, 22.7, 25.8], "category_id": 1, "id": 1, "ignore": 0}, 
    {"segmentation": [[104.5, 152.8, 116.5, 150.9, 109.9, 158.4, 107.3, 164.1, 117.7, 162.5]], "area": 953.2800000000001, "iscrowd": 0, "image_id": 0, "bbox": [99.3, 139.2, 28.8, 33.1], "category_id": 1, "id": 2, "ignore": 0},
    {"segmentation": [[823.0, 102.6, 832.1, 102.6, 826.2, 107.1, 823.6, 112.3, 830.9, 112.2]], "area": 497.96000000000004, "iscrowd": 0, "image_id": 0, "bbox": [819.0, 95.6, 21.1, 23.6], "category_id": 1, "id": 3, "ignore": 0}, 
    {"segmentation": [[955.1, 94.6, 971.3, 96.7, 961.0, 106.2, 954.8, 111.8, 966.8, 113.3]], "area": 1760.5900000000001, "iscrowd": 0, "image_id": 0, "bbox": [945.4, 76.2, 37.7, 46.7], "category_id": 1, "id": 4, "ignore": 0}, 
    {"segmentation": [[597.0, 121.9, 603.2, 121.7, 600.3, 125.3, 598.1, 127.7, 602.5, 127.5]], "area": 195.35999999999999, "iscrowd": 0, "image_id": 0, "bbox": [593.3, 115.6, 13.2, 14.8], "category_id": 1, "id": 5, "ignore": 0}, 
    {"segmentation": [[756.2, 115.3, 762.5, 115.1, 759.5, 118.2, 757.2, 121.5, 762.1, 121.3]], "area": 221.1, "iscrowd": 0, "image_id": 0, "bbox": [752.5, 108.7, 13.4, 16.5], "category_id": 1, "id": 6, "ignore": 0}, 
    {"segmentation": [[358.1, 117.4, 372.8, 116.2, 370.0, 123.7, 361.8, 134.2, 373.6, 133.4]], "area": 1874.5200000000002, "iscrowd": 0, "image_id": 0, "bbox": [340.3, 96.7, 38.1, 49.2], "category_id": 1, "id": 7, "ignore": 0}, 
    {"segmentation": [[379.5, 129.0, 389.0, 129.0, 384.7, 133.6, 380.9, 138.7, 387.5, 138.7]], "area": 552.16, "iscrowd": 0, "image_id": 0, "bbox": [373.1, 116.6, 20.3, 27.2], "category_id": 1, "id": 8, "ignore": 0}, 
    {"segmentation": [[709.0, 126.4, 713.6, 126.1, 711.4, 128.5, 709.7, 130.8, 713.6, 130.6]], "area": 124.23, "iscrowd": 0, "image_id": 0, "bbox": [706.5, 121.5, 10.1, 12.3], "category_id": 1, "id": 9, "ignore": 0},
    {"segmentation": [[572.8, 126.0, 581.4, 126.0, 576.7, 131.5, 574.6, 134.5, 580.3, 134.4]], "area": 371.05, "iscrowd": 0, "image_id": 0, "bbox": [569.0, 116.7, 18.1, 20.5], "category_id": 1, "id": 10, "ignore": 0}, 
    
    {"segmentation": [[931.5, 271.4, 943.9, 269.6, 936.0, 278.6, 935.2, 286.0, 944.5, 284.4]], "area": 1200.3700000000001, "iscrowd": 0, "image_id": 1, "bbox": [927.0, 255.3, 30.7, 39.1], "category_id": 1, "id": 11, "ignore": 0},
    {"segmentation": [[473.7, 339.6, 481.5, 339.6, 474.1, 345.6, 475.3, 351.7, 481.4, 351.4]], "area": 818.4, "iscrowd": 0, "image_id": 1, "bbox": [471.2, 326.5, 24.8, 33.0], "category_id": 1, "id": 12, "ignore": 0},
    {"segmentation": [[28.5, 326.5, 34.1, 323.5, 31.7, 333.3, 39.8, 337.5, 42.5, 334.7]], "area": 912.0300000000001, "iscrowd": 0, "image_id": 1, "bbox": [23.9, 310.9, 30.1, 30.3], "category_id": 1, "id": 13, "ignore": 0}, 
    {"segmentation": [[413.6, 314.8, 418.6, 315.9, 412.2, 319.4, 412.7, 324.3, 416.4, 324.8]], "area": 477.52, "iscrowd": 0, "image_id": 1, "bbox": [410.3, 305.7, 18.8, 25.4], "category_id": 1, "id": 14, "ignore": 0}, 
    {"segmentation": [[599.5, 263.3, 614.7, 263.0, 603.4, 272.6, 601.1, 283.4, 612.3, 283.2]], "area": 1978.4599999999998, "iscrowd": 0, "image_id": 1, "bbox": [594.8, 242.8, 37.4, 52.9], "category_id": 1, "id": 15, "ignore": 0}, 
    {"segmentation": [[828.2, 290.6, 839.6, 290.0, 832.2, 297.0, 830.0, 303.8, 838.8, 303.3]], "area": 865.8, "iscrowd": 0, "image_id": 1, "bbox": [824.6, 278.5, 26.0, 33.3], "category_id": 1, "id": 16, "ignore": 0},
    ...
    {"segmentation": [[738.1, 329.4, 747.3, 329.3, 741.2, 334.4, 738.8, 340.2, 746.2, 340.1]], "area": 607.7599999999999, "iscrowd": 0, "image_id": 1, "bbox": [734.6, 319.3, 21.4, 28.4], "category_id": 1, "id": 17, "ignore": 0}, 
    {"segmentation": [[876.7, 210.8, 877.4, 211.2, 874.3, 218.4, 878.8, 225.6, 879.2, 225.7]], "area": 847.5, "iscrowd": 0, "image_id": 12862, "bbox": [872.6, 197.0, 22.6, 37.5], "category_id": 1, "id": 113613, "ignore": 0}], 
    "categories":
    [
    {"name": "background", "id": 0}, 
    {"name": "face", "id": 1}]}

典型的coco数据结构，我基本参考了原来的cocoapi，但也做了不小的改动，主要包括：

1.  显示方式发生了变化，这次简单地显示成多边形吧（其实也可以用数据点或数字）
2.  mask（RLE）不需要了，因此没有maskutil，无需编译安装，直接python搞定

源码分成两个文件，一个是主文件，随便取个名吧：unknown.py

# @MxTan from SpaceVision SZ Co.Ltd 
    #
    # @brief  for display landmark annotations piece by piece
    #
    # ref. windows version cocoapi if you need a mask version
    # https://github.com/philferriere/cocoapi
    #
    #
    
    from CoLandMark import LandMark
    import numpy as np
    import skimage.io as io #conda install scikit-image
    import json
    import os
     
    import matplotlib as mpl
    mpl.use('TkAgg')
    import pylab
    import matplotlib.rcsetup as rcsetup
    pylab.rcParams['figure.figsize'] = (8.0, 10.0)
     
    dataDir='D:/vsAI/libfacedetectiontrain/data/widerface/WIDER_train/images'
    annFile= 'trainset.json'
     
    # initialize COCO api for instance annotations
    coco=LandMark(annFile)
     
    # display COCO categories
    catIds = coco.getCatIds()
    cats = coco.loadCats(catIds)
    nms=[cat['name'] for cat in cats] 
    print('COCO format categories: \n{}\n'.format(' '.join(nms)))
     
    # recursively display all images and its masks
    imgIds = coco.getImgIds()
    for id in imgIds: 
        mpl.pyplot.clf()  #put a stop breakpoint here, each cycle you will see a marked image
        annIds = coco.getAnnIds([id], catIds=catIds, iscrowd=None)
        anns = coco.loadAnns(annIds)
        imgIds = coco.getImgIds(imgIds = [id])
        img = coco.loadImgs(imgIds[0])[0]
    
        #----- save seperate image ----
        #file_name_ext='./WIDER_train/images/' + img['file_name']
        #(filename,extension) = os.path.splitext(file_name_ext)
        #file_path = "coco/" + filename + ".json"
        #data = {"annotations":anns}
        #with open(file_path, 'w') as result_file:
        #    json.dump(data, result_file)
        
        #----display image----
        file_path = '{}/{}'.format(dataDir,img['file_name'])
        I = io.imread(file_path) 
        #NOTE: the above method is equivalent to the following format
        #I = io.imread('%s/%s'%(dataDir,img['file_name']))  
    
        mpl.pyplot.imshow(I)
        mpl.pyplot.axis('off')
        coco.showAnns(anns)

标注工具文件取名叫做CoLandMark.py（原来叫COCO.py），里面那个类改名为LandMark，以避免同时使用原来的CoCo时冲突。

__author__ = 'tylin'
    __version__ = '2.0'
    
    # A copy from CocoApi, but some modifications are made to cope withe the landmark display
    #
    # AN alternative import lib for landmark points (NO area rle code required, so we removed the mask part)
    
    # The following API functions are defined:
    #  COCO       - COCO api class that loads COCO annotation file and prepare data structures.
    #  decodeMask - Decode binary mask M encoded via run-length encoding.
    #  encodeMask - Encode binary mask M using run-length encoding.
    #  getAnnIds  - Get ann ids that satisfy given filter conditions.
    #  getCatIds  - Get cat ids that satisfy given filter conditions.
    #  getImgIds  - Get img ids that satisfy given filter conditions.
    #  loadAnns   - Load anns with the specified ids.
    #  loadCats   - Load cats with the specified ids.
    #  loadImgs   - Load imgs with the specified ids.
    #  annToMask  - Convert segmentation in an annotation to binary mask.
    #  showAnns   - Display the specified annotations.
    #  loadRes    - Load algorithm results and create API for accessing them.
    #  download   - Download COCO images from mscoco.org server.
    # Throughout the API "ann"=annotation, "cat"=category, and "img"=image.
    # Help on each functions can be accessed by: "help COCO>function".
    
    # See also COCO>decodeMask,
    # COCO>encodeMask, COCO>getAnnIds, COCO>getCatIds,
    # COCO>getImgIds, COCO>loadAnns, COCO>loadCats,
    # COCO>loadImgs, COCO>annToMask, COCO>showAnns
    
    # Microsoft COCO Toolbox.      version 2.0
    # Data, paper, and tutorials available at:  http://mscoco.org/
    # Code written by Piotr Dollar and Tsung-Yi Lin, 2014.
    # Licensed under the Simplified BSD License [see bsd.txt]
    import json
    import time
    import numpy as np
    import copy
    import itertools
    
    import matplotlib
    matplotlib.use('Agg')
    import matplotlib.pyplot as plt
    from matplotlib.collections import PatchCollection
    from matplotlib.patches import Polygon
    
    import os
    from collections import defaultdict
    import sys
    PYTHON_VERSION = sys.version_info[0]
    if PYTHON_VERSION == 2:
        from urllib import urlretrieve
    elif PYTHON_VERSION == 3:
        from urllib.request import urlretrieve
    
    
    def _isArrayLike(obj):
        return hasattr(obj, '__iter__') and hasattr(obj, '__len__')
    
    
    class LandMark:
        def __init__(self, annotation_file=None):
            """
            Constructor of Microsoft COCO helper class for reading and visualizing annotations.
            :param annotation_file (str): location of annotation file
            :param image_folder (str): location to the folder that hosts images.
            :return:
            """
            # load dataset
            self.dataset,self.anns,self.cats,self.imgs = dict(),dict(),dict(),dict()
            self.imgToAnns, self.catToImgs = defaultdict(list), defaultdict(list)
            if not annotation_file == None:
                print('loading annotations into memory...')
                tic = time.time()
                dataset = json.load(open(annotation_file, 'r'))
                assert type(dataset)==dict, 'annotation file format {} not supported'.format(type(dataset))
                print('Done (t={:0.2f}s)'.format(time.time()- tic))
                self.dataset = dataset
                self.createIndex()
    
        def createIndex(self):
            # create index
            print('creating index...')
            anns, cats, imgs = {}, {}, {}
            imgToAnns,catToImgs = defaultdict(list),defaultdict(list)
            if 'annotations' in self.dataset:
                for ann in self.dataset['annotations']:
                    imgToAnns[ann['image_id']].append(ann)
                    anns[ann['id']] = ann
    
            if 'images' in self.dataset:
                for img in self.dataset['images']:
                    imgs[img['id']] = img
    
            if 'categories' in self.dataset:
                for cat in self.dataset['categories']:
                    cats[cat['id']] = cat
    
            if 'annotations' in self.dataset and 'categories' in self.dataset:
                for ann in self.dataset['annotations']:
                    catToImgs[ann['category_id']].append(ann['image_id'])
    
            print('index created!')
    
            # create class members
            self.anns = anns
            self.imgToAnns = imgToAnns
            self.catToImgs = catToImgs
            self.imgs = imgs
            self.cats = cats
    
        def info(self):
            """
            Print information about the annotation file.
            :return:
            """
            for key, value in self.dataset['info'].items():
                print('{}: {}'.format(key, value))
    
        def getAnnIds(self, imgIds=[], catIds=[], areaRng=[], iscrowd=None):
            """
            Get ann ids that satisfy given filter conditions. default skips that filter
            :param imgIds  (int array)     : get anns for given imgs
                   catIds  (int array)     : get anns for given cats
                   areaRng (float array)   : get anns for given area range (e.g. [0 inf])
                   iscrowd (boolean)       : get anns for given crowd label (False or True)
            :return: ids (int array)       : integer array of ann ids
            """
            imgIds = imgIds if _isArrayLike(imgIds) else [imgIds]
            catIds = catIds if _isArrayLike(catIds) else [catIds]
    
            if len(imgIds) == len(catIds) == len(areaRng) == 0:
                anns = self.dataset['annotations']
            else:
                if not len(imgIds) == 0:
                    lists = [self.imgToAnns[imgId] for imgId in imgIds if imgId in self.imgToAnns]
                    anns = list(itertools.chain.from_iterable(lists))
                else:
                    anns = self.dataset['annotations']
                anns = anns if len(catIds)  == 0 else [ann for ann in anns if ann['category_id'] in catIds]
                anns = anns if len(areaRng) == 0 else [ann for ann in anns if ann['area'] > areaRng[0] and ann['area'] < areaRng[1]]
            if not iscrowd == None:
                ids = [ann['id'] for ann in anns if ann['iscrowd'] == iscrowd]
            else:
                ids = [ann['id'] for ann in anns]
            return ids
    
        def getCatIds(self, catNms=[], supNms=[], catIds=[]):
            """
            filtering parameters. default skips that filter.
            :param catNms (str array)  : get cats for given cat names
            :param supNms (str array)  : get cats for given supercategory names
            :param catIds (int array)  : get cats for given cat ids
            :return: ids (int array)   : integer array of cat ids
            """
            catNms = catNms if _isArrayLike(catNms) else [catNms]
            supNms = supNms if _isArrayLike(supNms) else [supNms]
            catIds = catIds if _isArrayLike(catIds) else [catIds]
    
            if len(catNms) == len(supNms) == len(catIds) == 0:
                cats = self.dataset['categories']
            else:
                cats = self.dataset['categories']
                cats = cats if len(catNms) == 0 else [cat for cat in cats if cat['name']          in catNms]
                cats = cats if len(supNms) == 0 else [cat for cat in cats if cat['supercategory'] in supNms]
                cats = cats if len(catIds) == 0 else [cat for cat in cats if cat['id']            in catIds]
            ids = [cat['id'] for cat in cats]
            return ids
    
        def getImgIds(self, imgIds=[], catIds=[]):
            '''
            Get img ids that satisfy given filter conditions.
            :param imgIds (int array) : get imgs for given ids
            :param catIds (int array) : get imgs with all given cats
            :return: ids (int array)  : integer array of img ids
            '''
            imgIds = imgIds if _isArrayLike(imgIds) else [imgIds]
            catIds = catIds if _isArrayLike(catIds) else [catIds]
    
            if len(imgIds) == len(catIds) == 0:
                ids = self.imgs.keys()
            else:
                ids = set(imgIds)
                for i, catId in enumerate(catIds):
                    if i == 0 and len(ids) == 0:
                        ids = set(self.catToImgs[catId])
                    else:
                        ids &= set(self.catToImgs[catId])
            return list(ids)
    
        def loadAnns(self, ids=[]):
            """
            Load anns with the specified ids.
            :param ids (int array)       : integer ids specifying anns
            :return: anns (object array) : loaded ann objects
            """
            if _isArrayLike(ids):
                return [self.anns[id] for id in ids]
            elif type(ids) == int:
                return [self.anns[ids]]
    
        def loadCats(self, ids=[]):
            """
            Load cats with the specified ids.
            :param ids (int array)       : integer ids specifying cats
            :return: cats (object array) : loaded cat objects
            """
            if _isArrayLike(ids):
                return [self.cats[id] for id in ids]
            elif type(ids) == int:
                return [self.cats[ids]]
    
        def loadImgs(self, ids=[]):
            """
            Load anns with the specified ids.
            :param ids (int array)       : integer ids specifying img
            :return: imgs (object array) : loaded img objects
            """
            if _isArrayLike(ids):
                return [self.imgs[id] for id in ids]
            elif type(ids) == int:
                return [self.imgs[ids]]
    
        def showAnns(self, anns):
            """
            Display the specified annotations.
            :param anns (array of object): annotations to display
            :return: None
            """
            if len(anns) == 0:
                return 0
            if 'segmentation' in anns[0] or 'keypoints' in anns[0]:
                datasetType = 'instances'
            elif 'caption' in anns[0]:
                datasetType = 'captions'
            else:
                raise Exception('datasetType not supported')
            if datasetType == 'instances':
                #plt.clf()  #clear the foreground image
                #plt.cla()  # clear the axis
                ax = plt.gca()
                ax.set_autoscale_on(False)
                polygons = []
                color = []
                for ann in anns:
                    c = (np.random.random((1, 3))*0.6+0.4).tolist()[0]
                    if 'segmentation' in ann:
                        if type(ann['segmentation']) == list:
                            # polygon
                            for seg in ann['segmentation']:
                                poly = np.array(seg).reshape((int(len(seg)/2), 2))
                                polygons.append(Polygon(poly))
                                color.append(c)
                        #else:
                            # # mask
                            # t = self.imgs[ann['image_id']]
                            # if type(ann['segmentation']['counts']) == list:
                            #     rle = maskUtils.frPyObjects([ann['segmentation']], t['height'], t['width'])
                            # else:
                            #     rle = [ann['segmentation']]
                            # m = maskUtils.decode(rle)
                            # img = np.ones( (m.shape[0], m.shape[1], 3) )
                            # if ann['iscrowd'] == 1:
                            #     color_mask = np.array([2.0,166.0,101.0])/255
                            # if ann['iscrowd'] == 0:
                            #     color_mask = np.random.random((1, 3)).tolist()[0]
                            # for i in range(3):
                            #     img[:,:,i] = color_mask[i]
                            # ax.imshow(np.dstack( (img, m*0.5) ))
                    if 'keypoints' in ann and type(ann['keypoints']) == list:
                        # turn skeleton into zero-based index
                        sks = np.array(self.loadCats(ann['category_id'])[0]['skeleton'])-1
                        kp = np.array(ann['keypoints'])
                        x = kp[0::3]
                        y = kp[1::3]
                        v = kp[2::3]
                        for sk in sks:
                            if np.all(v[sk]>0):
                                plt.plot(x[sk],y[sk], linewidth=3, color=c)
                        plt.plot(x[v>0], y[v>0],'o',markersize=8, markerfacecolor=c, markeredgecolor='k',markeredgewidth=2)
                        plt.plot(x[v>1], y[v>1],'o',markersize=8, markerfacecolor=c, markeredgecolor=c, markeredgewidth=2)
                #p = PatchCollection(polygons, facecolor=color, linewidths=0, alpha=0.4)
                #ax.add_collection(p)            
                p = PatchCollection(polygons, facecolor='none', edgecolors=color, linewidths=2)
                ax.add_collection(p)
            elif datasetType == 'captions':
                for ann in anns:
                    print(ann['caption'])
    
        def loadRes(self, resFile):
            """
            Load result file and return a result api object.
            :param   resFile (str)     : file name of result file
            :return: res (obj)         : result api object
            """
            res = LandMark()
            res.dataset['images'] = [img for img in self.dataset['images']]
    
            print('Loading and preparing results...')
            tic = time.time()
    
            # Check result type in a way compatible with Python 2 and 3.
            if PYTHON_VERSION == 2:
                is_string =  isinstance(resFile, basestring)  # Python 2
            elif PYTHON_VERSION == 3:
                is_string = isinstance(resFile, str)  # Python 3
            if is_string:
                anns = json.load(open(resFile))
            elif type(resFile) == np.ndarray:
                anns = self.loadNumpyAnnotations(resFile)
            else:
                anns = resFile
            assert type(anns) == list, 'results in not an array of objects'
            annsImgIds = [ann['image_id'] for ann in anns]
            assert set(annsImgIds) == (set(annsImgIds) & set(self.getImgIds())), \
                   'Results do not correspond to current coco set'
            if 'caption' in anns[0]:
                imgIds = set([img['id'] for img in res.dataset['images']]) & set([ann['image_id'] for ann in anns])
                res.dataset['images'] = [img for img in res.dataset['images'] if img['id'] in imgIds]
                for id, ann in enumerate(anns):
                    ann['id'] = id+1
            elif 'bbox' in anns[0] and not anns[0]['bbox'] == []:
                res.dataset['categories'] = copy.deepcopy(self.dataset['categories'])
                for id, ann in enumerate(anns):
                    bb = ann['bbox']
                    x1, x2, y1, y2 = [bb[0], bb[0]+bb[2], bb[1], bb[1]+bb[3]]
                    if not 'segmentation' in ann:
                        ann['segmentation'] = [[x1, y1, x1, y2, x2, y2, x2, y1]]
                    ann['area'] = bb[2]*bb[3]
                    ann['id'] = id+1
                    ann['iscrowd'] = 0
            elif 'segmentation' in anns[0]:
                res.dataset['categories'] = copy.deepcopy(self.dataset['categories'])
                for id, ann in enumerate(anns):
                    # now only support compressed RLE format as segmentation results
                    #ann['area'] = maskUtils.area(ann['segmentation'])
                    #if not 'bbox' in ann:
                    #    ann['bbox'] = maskUtils.toBbox(ann['segmentation'])
                    ann['id'] = id+1
                    ann['iscrowd'] = 0
            elif 'keypoints' in anns[0]:
                res.dataset['categories'] = copy.deepcopy(self.dataset['categories'])
                for id, ann in enumerate(anns):
                    s = ann['keypoints']
                    x = s[0::3]
                    y = s[1::3]
                    x0,x1,y0,y1 = np.min(x), np.max(x), np.min(y), np.max(y)
                    ann['area'] = (x1-x0)*(y1-y0)
                    ann['id'] = id + 1
                    ann['bbox'] = [x0,y0,x1-x0,y1-y0]
            print('DONE (t={:0.2f}s)'.format(time.time()- tic))
    
            res.dataset['annotations'] = anns
            res.createIndex()
            return res
    
        def download(self, tarDir = None, imgIds = [] ):
            '''
            Download COCO images from mscoco.org server.
            :param tarDir (str): COCO results directory name
                   imgIds (list): images to be downloaded
            :return:
            '''
            if tarDir is None:
                print('Please specify target directory')
                return -1
            if len(imgIds) == 0:
                imgs = self.imgs.values()
            else:
                imgs = self.loadImgs(imgIds)
            N = len(imgs)
            if not os.path.exists(tarDir):
                os.makedirs(tarDir)
            for i, img in enumerate(imgs):
                tic = time.time()
                fname = os.path.join(tarDir, img['file_name'])
                if not os.path.exists(fname):
                    urlretrieve(img['coco_url'], fname)
                print('downloaded {}/{} images (t={:0.1f}s)'.format(i, N, time.time()- tic))
    
        def loadNumpyAnnotations(self, data):
            """
            Convert result data from a numpy array [Nx7] where each row contains {imageID,x1,y1,w,h,score,class}
            :param  data (numpy.ndarray)
            :return: annotations (python nested list)
            """
            print('Converting ndarray to lists...')
            assert(type(data) == np.ndarray)
            print(data.shape)
            assert(data.shape[1] == 7)
            N = data.shape[0]
            ann = []
            for i in range(N):
                if i % 1000000 == 0:
                    print('{}/{}'.format(i,N))
                ann += [{
                    'image_id'  : int(data[i, 0]),
                    'bbox'  : [ data[i, 1], data[i, 2], data[i, 3], data[i, 4] ],
                    'score' : data[i, 5],
                    'category_id': int(data[i, 6]),
                    }]
            return ann
    
        # def annToRLE(self, ann):
        #     """
        #     Convert annotation which can be polygons, uncompressed RLE to RLE.
        #     :return: binary mask (numpy 2D array)
        #     """
        #     t = self.imgs[ann['image_id']]
        #     h, w = t['height'], t['width']
        #     segm = ann['segmentation']
        #      if type(segm) == list:
        #          # polygon -- a single object might consist of multiple parts
        #          # we merge all parts into one mask rle code
        #          rles = maskUtils.frPyObjects(segm, h, w)
        #          rle = maskUtils.merge(rles)
        #      elif type(segm['counts']) == list:
        #          # uncompressed RLE
        #          rle = maskUtils.frPyObjects(segm, h, w)
        #      else:
        #          # rle
        #         rle = ann['segmentation']
        #     return rle
    
        # def annToMask(self, ann):
        #     """
        #     Convert annotation which can be polygons, uncompressed RLE, or RLE to binary mask.
        #     :return: binary mask (numpy 2D array)
        #     """
        #     rle = self.annToRLE(ann)
        #     m = maskUtils.decode(rle)
        #     return m

注释掉的部分我没有删除，大家可以和原文比较。

[https_github.com_ShiqiYu_libfacedetection.train]: https://github.com/ShiqiYu/libfacedetection.train