Debugging with ImageView.jl

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Here is the full solution. You have to include the annotations in the creation of the roi_dict. It took some digging but you also need give a zr::Signal{ZoomRegion{T}} to use the desired version of imshow. To get an out of the box solution, I needed to also inclued GtkReactive.

using Statistics, Images, ImageView, Gtk.ShortNames, GtkReactive
function ex()
    numCols, numRows, numFrames = 100, 100, 100
    frameRate = 1 # numFrames / sec
    p0 = [25, 25] # initial position of target
    v = [1, 1] #  velocity pixel / sec
    img = randn(numCols, numRows, numFrames) # creat white noise background
    kernel = 10 .* [0 1 0;
                    1 2 1;
                    0 1 0] # simple bright target
    p_truth = zeros(2, numFrames)
    for fn = 1:numFrames
        p = p0 + (fn / frameRate-1) * v # constant velocity
        y, x = Int(round(p[1])), Int(round(p[2]))  # convert position to nearest pixel for simplicity
        if 1 < y < numCols && 1 < x < numRows # our kernel is 3x3 so only get within one of the edge
            img[y-1:y+1, x-1:x+1, fn] = kernel
        end
        p_truth[:,fn] = p
    end
    img .-= minimum(img)
    img = n0f8.(img./maximum(img))
    gd = imshow_gui((numCols, numRows))
    c = gd["canvas"]
    Gtk.showall(gd["window"])
    sig = ImageView.Signal(img[:,:,1])
    anns = annotations()
    roi_dict = imshow(c, sig, Signal(ZoomRegion(value(sig))), anns)
    for fn in 2:numFrames
        push!(sig, img[:,:,fn]) # this works, and zoom is still supported
        # Get detections from algo
        list_of_detections = [p_truth[:,fn]] # for simplicity only grab true detections
        aIx = []
        for p in list_of_detections
            y, x = Int(round(p[1])), Int(round(p[2]))
            # Creating annotation do not show after first frame
            a = annotate!(anns, c, roi_dict,
                        AnnotationBox(x - 5, y - 5,
                                      x + 5, y + 5,
                                      linewidth=2, color=RGB(1,0,0))
                        )
            push!(aIx, a)
        end
        sleep(0.5)
        [delete!(anns,a) for a in aIx] # remove previous detections after they have been seen
    end
end
ex()
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