Darknet: how to use the images contains no objects?

[liyheart]

In my setting, there are some images contain some persons and some images no persons(background images). how can i use all of them for training the yolo? Should I add empty txt files for the background images?

[AlexeyAB]

Should I add empty txt files for the background images?

Yes.

https://github.com/AlexeyAB/darknet#how-to-improve-object-detection

desirable that your training dataset include images with non-labeled objects that you do not want to detect - negative samples without bounded box (empty .txt files) - use as many images of negative samples as there are images with objects

[PhantomClick]

Should i give background images as an another class? For example, if i want to detect cars, i should have a bunch of images with car with label 1. But when i add background images, should i create only empty file and configure my yolo_voc.cfg file's class value as a 1 or 2?

For example; because of i have 1 class, my file consists; classes=1 and filters=30. But did i do classes=2 and filters=35. (i'm talking about Yolov2)

Thank you @AlexeyAB

[Chida15]

Should i give background images as an another class? For example, if i want to detect cars, i should have a bunch of images with car with label 1. But when i add background images, should i create only empty file and configure my yolo_voc.cfg file's class value as a 1 or 2?

For example; because of i have 1 class, my file consists; classes=1 and filters=30. But did i do classes=2 and filters=35. (i'm talking about Yolov2)

Thank you @AlexeyAB

how did you deal with it? I also met this problem.

[dasmehdix]

Do we have to add the negative image paths to the train.txt file?

[Chida15]

Do we have to add the negative image paths to the train.txt file?

Yes, you are supposed to add it to your train.txt

[DuCheng2018]

How does yolo use these empty labels to calculate loss?
One told me that these empty labels will be coded as a point [0,0,0,0,1] in background. But I`m confused about that.

[nathnim]

Dear all, can the negative images be added to both train.txt and valid.txt? Thanks!

[robisen1]

Dear all, can the negative images be added to both train.txt and valid.txt? Thanks!

yes. that's what i do.