GCC-CL(GCC dataset Collector and Labeler) is a tool for generating synethic crowd image datasets. It consists of two parts, collector and labeler. The former is used to generate crowd image information; the latter produce input and output file through those information for crowd count models.

GCC-Collector is a tool to generate crowd image and head points in GTA V. It is a custom plugin running along with GTAV, written in C .

Attention!!! All mods must be used in the offline version of GTA V.

• ScriptHookV
• DirectXTK
• minhook
• eigen

1. Navigate to GCC-Collector directory, use Visual Studio to open the project GCC-Collector.sln.
2. Open the project (GCC-Collector) property pages, General/Windos SDK Version, select the latest win10 SDK existed in your computer.
3. Install minhook and eigen using NuGet.
4. Make sure Configution is release, Platform is x64, and then use hot key ctrl shift B to compile the project. As a result, asi file GCC-Collector.asi will be generated in /GCC-CL/GCC-Collector/x64/Release

1. Following Script Hook V installation steps, copy ScriptHookV.dll, dinput8.dll and compiled GCC-Collector.asi to the game's root folder (where GTA5.exe is located);
2. Use this mod(No Chromatic aberration & Lens distortion) to avoid chromatic aberration and lens distortion;
3. Compile or directly use the compiled plugin-in unlimitedLife.asi, noVehicle.asi. Just copy these two asi to the games's root folder.

• unlimitedLife.asi makes sure the player undead.
• noVehicle.asi is optional. When you are creating some crowd images in the street, this plugin-in helps you avoid accidents caused by vehicles entering the scene. And it also set the number of pedestrians created by game scenario close to zero.

To create a series of crowd images in one scene, You should follow the steps below:

1. download GCC-COllector-Tool and put SceneDirectorAnim.txt in the game's root folder.
2. Create a directory named data in the game's root folder.
3. Open GTA V in the offline version.
4. Control your role in GTAV go to the scene where you want use it as the background of the crowd images which would be generated.
5. Press F9 to start a scene script;
6. Press F10 to adjust the camera. use W, A, S, D to move the camera forward, left, backward and right, mouse button(left or right button both works) to move up or down, shift/ctrl to speed up or slow down, and /- to adjust the field of view. When the camera has the desired angle, press F10 again to stop adjust camera and record camera location information automatically.
7. Press F11 to start drawing the crowd generation area. Use the method of connecting multiple points to form a polygon by moving your game character in the scene. Press I to set a polygon vertex at current position. Press F11 again to end the drawing. The program automatically connects the points in a sequence set by the user. In the process of setting the vertices, you can press Tab to move the focus to a specific vertex, and then you can reset that point. During setting the vertices, you can press F10 to enter the camera view to observe the vertices or modify the camera settings. Press F10 again to return to set vertices. (Note that it will be better to set a convex polygon area, do not let the sides of the polygon cross.) Following the guide to readjust the camera, and other three cameras (from four different angle).
8. At last, you should confirm how many pedestrians you want to generate in the scene. Press F12 and follow the guide in the game, you will know how to do it.
9. Now one scene has been created and saved, press F5 to go back to original state, and do above steps(except step 1) again to recorded another scene.

After a series of scene have been created. restart the game, after the opening animation

1. colse the minimap if it is shown in the lower left corner of screen, or generating segement maps do not work well, as issue#7 demonstrated;
2. press L to launch the GCC-Collector to generate crowd with recorded.information
3. press 'F5' if you want to leave the process and go back to normal. The process would end after one-round of collecting.(Not immediately)

GCC-Labeler is written in Python3. It needs the following Python libraries:

• scipy
• numpy
• matplotlib
• PIL

You can install these libraries using pip.

main.py is the entrance of the project. Line 22 and 23 define the source path and the target path.

source_dir = 'source'
target_dir = 'target'

Source path is the path where the file you generated using GCC-Collector is located. The target path is used to specify where to store the final produced image files and the annotation files. Change two paths according to your actual situation. Just run python main.py, the final crowd count images and labels will be generated in target_dir.

For example, the source directory(the data folder we created in GCC-Collector) like this:

source/
`-- part_11_2
    |-- 1534540881
    |   |-- part_0.raw
    |   |-- part_0_0.bmp
    |   |-- part_0_1.bmp
    |   |-- part_180.raw
    |   |-- part_180_0.bmp
    |   |-- part_180_1.bmp
    |   |-- part_360.raw
    |   |-- part_360_0.bmp
    |   |-- part_360_1.bmp
    |   `-- pedInfo.xml
    |-- 1534575913
    |   |-- part_0.raw
    |   |-- part_0_0.bmp
    |   |-- part_0_1.bmp
    |   |-- part_180.raw
    |   |-- part_180_0.bmp
    |   |-- part_180_1.bmp
    |   |-- part_360.raw
    |   |-- part_360_0.bmp
    |   |-- part_360_1.bmp
    |   `-- pedInfo.xml
    |-- Zheight.log
    |-- areaInfo.log
    |-- eyeInfo.log
    `-- levelInfo.log

3 directories, 24 files

After we run the main.py, we can get the target directory like this:

target/
`-- scene_11_2
    |-- jpgs
    |   |-- 1534540881.jpg
    |   `-- 1534575913.jpg
    |-- jsons
    |   |-- 1534540881.json
    |   `-- 1534575913.json
    |-- mats
    |   |-- 1534540881.mat
    |   `-- 1534575913.mat
    |-- pngs
    |   |-- 1534540881.png
    |   `-- 1534575913.png
    |-- segs
    |   |-- 1534540881.raw
    |   `-- 1534575913.raw
    `-- vis
        |-- 1534540881.jpg
        `-- 1534575913.jpg

7 directories, 12 files

Some code borrows from gtav-mod-scene-director and GTAVisionExport. The former gave us so many examples for how to use these functions in Script Hook V. The latter inspired us to extract crowd mask.

If you find this project useful for your research, please cite:

@inproceedings{wang2019learning,
  title={Learning from Synthetic Data for Crowd Counting in the Wild},
  author={Wang, Qi and Gao, Junyu and Lin, Wei and Yuan, Yuan},
  booktitle={Proceedings of IEEE Conference on Computer Vision and Pattern Recognition (CVPR)},
  pages={8198--8207},
  year={2019}
}