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Some problems for Cityscapes preprocessing #2

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aqzhang218 opened this issue Dec 5, 2024 · 3 comments
Open

Some problems for Cityscapes preprocessing #2

aqzhang218 opened this issue Dec 5, 2024 · 3 comments

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@aqzhang218
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I used these instructions to preprocess cityscapes
python prepare_train_data.py
--img_height 512
--img_width 1024
--dataset_dir <path_to_downloaded_cityscapes_data>
--dataset_name cityscapes
--dump_root <your_preprocessed_cityscapes_path>
--seq_length 3
--num_threads 8
But when I set --seq_length 3, nothing should happen to the data set, and there's nothing in the preprocessed_cityscapes folder, but when I set --seq_length 1, The processed images appear in the preprocessed_cityscapes folder. Do the Settings --seq_length 3 and --seq_length 1 affect the images?

@LiuJF1226
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LiuJF1226 commented Dec 5, 2024

Hi, seq_length=3 means that we process (-2, 0, 2) frames, stack them into a single image and save it. When training, we load this image and split it into 3 parts, i.e., the target frame (0) and the source frames (-2, 2). If you set seq_length=1, the saved image will only contain frame 0. To align with the training setting of our method and previous methods like ManyDepth, you should use seq_length=3.

BTW, you succeed to run it with seq_length=1, so I think there is no bug. You may check it again. Maybe wait a while for the processing?

Another possibility: dump_root should not be an existing folder. When you rerun this script, you'd better set a new path for dump_root or delete the existing one.

@aqzhang218
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Thank you very much for your answer. I think there may be a problem with the data set. May I ask if you have the resource leftImg8bit_sequence_trainvaltest.zip? The link to the official website is too slow to download.

@LiuJF1226
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LiuJF1226 commented Dec 5, 2024

I am sorry that I don't have the resource now. Maybe VPN is helpful. And you can also download with wget (refer to https://github.com/cemsaz/city-scapes-script). If you try wget, note that the package ID for leftImg8bit_sequence_trainvaltest.zip is 14.

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