关于python:基于安卓手机的辅助驾驶APP开发

from pycocotools.coco import COCO
import numpy as np
import skimage.io as io
import matplotlib.pyplot as plt
import os
from PIL import Image
from PIL import ImageDraw
import csv
import shutil​
def create_coco_maps(ann_handle):

coco_name_maps = {}
coco_id_maps = {}
cat_ids = ann_handle.getCatIds()
cat_infos = ann_handle.loadCats(cat_ids)
for cat_info in cat_infos:
    cat_name = cat_info['name']
    cat_id = cat_info['id']
    if cat_name not in coco_name_maps.keys():
        coco_name_maps[cat_name] = cat_id
    if cat_id not in coco_id_maps.keys():
        coco_id_maps[cat_id] = cat_name​
return coco_name_maps, coco_id_maps

def get_need_cls_ids(need_cls_names, coco_name_maps):

need_cls_ids = []
for cls_name in coco_name_maps.keys():
    if cls_name in need_cls_names:
        need_cls_ids.append(coco_name_maps[cls_name])
return need_cls_ids

def get_new_label_id(name, need_cls_names):

for i,need_name in enumerate(need_cls_names):
    if name == need_name:
        return i
return None

if name == ‘__main__’:

# create coco ann handle
need_cls_names = ['person','bicycle','car','motorcycle','bus','truck','traffic light']
dst_img_dir = '/dataset/coco_traffic_yolov5/images/val/'
dst_label_dir = '/dataset/coco_traffic_yolov5/labels/val/'
min_side = 0.04464 # while 224*224, min side is 10. 0.04464=10/224
dataDir='/dataset/COCO/'
dataType='val2017'
annFile = '{}/annotations/instances_{}.json'.format(dataDir,dataType)
ann_handle=COCO(annFile)
# create coco [电子钱包](https://www.gendan5.com/wallet.html)maps for id and name
coco_name_maps, coco_id_maps = create_coco_maps(ann_handle)​
# get need_cls_ids
need_cls_ids = get_need_cls_ids(need_cls_names, coco_name_maps)​
# get all imgids
img_ids = ann_handle.getImgIds() # get all imgids
for i,img_id in enumerate(img_ids):
    print('process img: %d/%d'%(i, len(img_ids)))
    new_info = ''
    img_info = ann_handle.loadImgs(img_id)[0]
    img_name = img_info['file_name']
    img_height = img_info['height']
    img_width = img_info['width']​
    boj_infos = []
    ann_ids = ann_handle.getAnnIds(imgIds=img_id,iscrowd=None)
    for ann_id in ann_ids:
        anns = ann_handle.loadAnns(ann_id)[0]
        obj_cls = anns['category_id']
        obj_name = coco_id_maps[obj_cls]
        obj_box = anns['bbox'] 
        if obj_name in need_cls_names:
            new_label = get_new_label_id(obj_name, need_cls_names)
            x1 = obj_box[0]
            y1 = obj_box[1]
            w = obj_box[2]
            h = obj_box[3]
            #x_c_norm = (x1) / img_width
            #y_c_norm = (y1) / img_height
            x_c_norm = (x1 + w / 2.0) / img_width
            y_c_norm = (y1 + h / 2.0) / img_height
            w_norm = w / img_width
            h_norm = h / img_height
            if w_norm > min_side and  h_norm > min_side:
                boj_infos.append('%d %.4f %.4f %.4f %.4f\n'%(new_label, x_c_norm, y_c_norm, w_norm, h_norm))
    if len(boj_infos) > 0:
        print('this img has need cls')
        shutil.copy(dataDir + '/' + dataType + '/' + img_name, dst_img_dir + '/' + img_name)
        with open(dst_label_dir + '/' + img_name.replace('.jpg', '.txt'), 'w') as f:
            f.writelines(boj_infos)
    else:
        print('this img has no need cls')