Can not change background color of rect_params on Jetson Xavier Platform

Accelerated Computing Intelligent Video Analytics DeepStream SDK
#1

• Hardware Platform Jetson Xavier
• DeepStream Version 5.0 Python bindings

Editing the deepstream-test1-app python, I want to change the background color to yellow:

while l_obj is not None:
            try:
                # Casting l_obj.data to pyds.NvDsObjectMeta
                #obj_meta=pyds.glist_get_nvds_object_meta(l_obj.data)
                obj_meta=pyds.NvDsObjectMeta.cast(l_obj.data)
            except StopIteration:
                break
            obj_counter[obj_meta.class_id] += 1
            obj_meta.rect_params.has_bg_color = 1
            obj_meta.rect_params.bg_color.set(1.0, 1.0, 0.0, 0.4)
            obj_meta.rect_params.border_color.set(1.0, 1.0, 0.0, 1.0)

            try: 
                l_obj=l_obj.next
            except StopIteration:
                break

but the result is

error
error1122×533 173 KB

It’s seem the bg_color is always green even I change the any value of bg_color.
I tested with the same codes above on dGPU (1050). It’s work.
Bests,

#5

Hi,
It looks specific to Jetson platforms. We will try to reproduce it.

#7

hi,
We can reproduce it on Xavier/r32.4.2. Will investigate and update.

1 Like
#8

Hi,
This will be fixed in next release.

#9

Thank you, looking foward for next release.

#11

Any update? When there will be the release with the fix?

#12

Hi federico.frontali,

We will have the next in coming weeks, please wait for our announcement.

#13

I have updated to DS5.0GA and I still cannot change the background color - no matter what settings its always green! Changing the border colors work fine.

#15

I have just noticed that in 5.0GA you have made the OSD source available.

If I specifically override the default and set the process-mode for the OSD element to CPU then the background colors work.

If I leave the default, which is VIC for tegra - the background colours are always green regardless of what RGBA values are provided.

There is also a setting for hw-blend-color-attr. I don’t really understand what this is so some more information and an example would be really helpful.
It seems that when the process-mode is VIC that this property is read for background colours instead of the RGBA properties in rect_params.
The problem with hw-blend-color-attr is that its defined per class id which means it will show that background color whenever there is a detection no matter what. I lose the power of being able to control when to show the background color.

As an example - when an object is stationary I want to change the background color. This does not seem to be possible with the hw-blend-color-attr.

#16

Hi,
We have verified in workng by setting osd property hw-blend-color-attr:

hw-blend-color-attr=0,1.0,1.0,0.0,0.3:1,0.0,1.0,1.0,0.3:2,0.0,0.0,1.0,0.3:3,0.0,1.0,0.0,0.3

Please give it a try.

#17

Please explain how this property can be used to shade a box only on certain events from within a pad probe? It does not look like it can.

An example use case is this:

You have a region of interest and only want to shade bboxes that are inside the roi. I can do this via a pad probe and updating the values in rect_params - however it only works if process_mode is CPU.

Maybe the hw-blend-color-attr property should be added to NvOSD_RectParams so that it can be dynamically changed.

#18

Hi,
If you would needs to update colors dynamically, CPU mode has to be used. VIC mode will require initialization of colors using the property(hw-blend-color-attr) at init time.