Float in the coordinate will cause error:

Traceback (most recent call last):
  File "voc2coco.py", line 154, in <module>
    convert(xml_files, args.json_file)
  File "voc2coco.py", line 109, in convert
    ymin = int(get_and_check(bndbox, "ymin", 1).text) - 1
ValueError: invalid literal for int() with base 10: '281.70000076293945'

Code:

Not sure:

• it is a general problem or not
• why there are float in my VOC2012 dataset

Check float in xml files:

grep '<ymin>[0-9].*\.' $VOC_PATH/Annotations/*.xml | head
# In general
grep '<[xy]m[ia][nx]>[0-9]\{0,4\}\.'  $VOC_PATH/Annotations/*.xml | head

Result:

$VOC_PATH/Annotations/2011_003353.xml:			<ymin>45.70000076293945</ymin>
$VOC_PATH/Annotations/2011_006777.xml:			<ymin>281.70000076293945</ymin>

BTW: Great code and blogs! It helps me a lot!

Hello,with your code, I transfer VOC to COCO, but the category id is the last four integers of the filename, please tell how to make it as 0-19 or 1-20

Number of xml files: 3000
Traceback (most recent call last):
File "E:/voc2coco-master/voc2coco.py", line 157, in
convert(xml_files, json_file)
File "E:/voc2coco-master/voc2coco.py", line 83, in convert
filename = get_and_check(root, "filename", 1).text
File "E:/voc2coco-master/voc2coco.py", line 29, in get_and_check
raise ValueError("Can not find %s in %s." % (name, root.tag))
ValueError: Can not find filename in annotation.

COCO expect that class ID starts from 1 as below,

However, It came to the notice that class ID starts from 0 in output.json.

To fix this issue, change the following line

Hello, why is the JSON file name I generated called BMP?My picture turned out to be JPG.for example "file_name": "030003592.bmp",

hello
i am going to retrain yolov3 with downsampled coco images. but i don't know how can i change the annotation file of coco dataset which is in .json format for this end. would you please tell me how can i change the annotation file?
thank you.

I know the height or width should be:

height = ymax - ymin + 1 = (ymax - (ymin -1))

Why we update the xmin and ymin by minus one? Is this because of the indexing system in python is start from zero?

xmin = int(get_and_check(bndbox, "xmin", 1).text) - 1
ymin = int(get_and_check(bndbox, "ymin", 1).text) - 1

why '-1' in state which convert xmin and ymin