How to change the colors of text-background and bounding-box border?

Robotics & Edge Computing Jetson & Embedded Systems Jetson AGX Xavier
1

Hi,
If I want to config the colors of text-background and bounding-box border same as original yolo(darknet),
how to modify the code of deepstream-yolo-app.cpp?

Does both attributes should be setup like bellowing codes in deepstream-yolo-app.cpp?

215   /* we set the osd properties here */
216   g_object_set (G_OBJECT (nvosd), "font-size", 15, NULL);

If I want to car, trunk, person and bicycle have their own color, how to modify the code?

2

Please have a look at the “osd_sink_pad_buffer_probe(…)” function in test1-app from the Deepstream SDK. The NvDsObjectParams has a txt_params struct which holds the background text color and bounding box color information. You can make similar changes in the “osd_sink_pad_buffer_probe(…)” of deepstream-yolo-app.cpp to set the desired colors.

3

@NvCJR

Do you mean I should create a function like gst_pad_add_probe (osd_sink_pad, GST_PAD_PROBE_TYPE_BUFFER,
osd_sink_pad_buffer_probe, NULL, NULL) in deepstream_test1_app.c, the osd_sink_pad_buffer_probe() will be launched and config txt_params, so that background text color and bounding box color will be changed?

If it is, the g_object_set() for color setting will be not required, am I right?

4

The function is already present in the app. You only need to change txt_params corresponding to NvDsObjectParams over here

https://github.com/NVIDIA-AI-IOT/deepstream_reference_apps/blob/master/yolo/apps/deepstream-yolo/deepstream-yolo-app.cpp#L82

5

@NvCJR,

Thanks a lot, when I fill up txt_params and rect_params the background text color and bounding box color have been changed.

Now, I have another questions:

  1. How to change the display mode of deepstream-yolo-app? I hope it can show on a window not full screen.
  2. How to modify the title style of bounding box? can it be changed to bold style?
6

Hi,

  1. The app uses an egl sink which can be resized using a mouse to the desired size.
  2. Do you mean increase the thickness of the bounding box size ? if yes, you can increase it here –
    https://github.com/NVIDIA-AI-IOT/deepstream_reference_apps/blob/master/yolo/plugins/gst-yoloplugin-tesla/gstyoloplugin.cpp#L675
7

@NvCJR

  1. No, I cannot resize using a mouse, it occupied full screen and all hot key except ctl+c. But this problem have been solved.
  2. No, I want to change the title text(eg. person, car…)to bold style.
8
  1. No currently that is not supported but you can vary the font size through nvosd’s font-size plugin property if that helps your use-case.