Updating bqplot image widget - python-3.x

Question

I'm working on a project that uses ipywidgets and bqplot to display and interact with an image.
Using ipywidgets and open cv I can modify an image, save it and update the value of the widget. But I also need the on_click_element aspect of bqplot, so I use the widget from the last one. I still have problems figuring out how to do the same thing with the widget in bqplot.
I would like to avoid to redraw the hole thing, but if needed it would have to close and redraw only the widget image since this is part of a bigger set of widgets. For example I would like to binarize the image using an arbitrary treshold.
From here I got the information on how to use the bqplot image widget: https://github.com/bqplot/bqplot/blob/master/examples/Marks/Object%20Model/Image.ipynb
I use something very similar to this to create the widget that I display.
from IPython.display import display
import ipywidgets as widgets
import bqplot as bq
with open('chelsea.png', 'rb') as f:
raw_image = f.read()
ipyimage = widgets.Image(value=raw_image, format='png')
x_sc = bq.LinearScale()
y_sc = bq.LinearScale()
bq_image = bq.Image(image=ipyimage, scales={'x':x_sc, 'y':y_sc})
img_ani = bq.Figure(marks=[bq_image], animation_duration=400)
display(img_ani)
After this I can't update the figure without redrawing the hole thing.
Any ideas?
jupyter 5.7.8,
ipython 7.5.0,
ipywidgets 7.5.1,
bqplot 0.12.10

Answer 1

Update the bqplot image mark by assigning a new image....
with open("chelsea2.png", 'rb') as f:
raw_image2 = f.read()
# ipyimage.value = raw_image2 # This doesn't seems to sync with widget display. Would require a redisplay of bqplot figure
# create new ipywidgets image and assign it to bqplot image
ipyimage2 = widgets.Image(value=raw_image2, format='png')
bq_image.image = ipyimage2