The node showed a colour image only, so debugging a depth pipeline meant
either trusting the numbers or writing a throwaway viewer. It now keeps one
panel per frame stream -- image and depth -- and tiles them side by side,
scaled to a common height. Wiring one is a plain viewer; wiring both shows
them together. bbox and text stay overlays rather than panels.
The contract follows what dora-zed already publishes: float32 [H, W] in
millimetres with 0 for missing. It is sent there as a raw byte slice, so the
payload arrives as UInt8 despite the Float32 contract and is reinterpreted
rather than converted.
Auto-ranging the colormap over the valid pixels' full extent, rather than over
a percentile of them, is deliberate and was not the first attempt: trimming
the tails collapsed on the scene the node exists for. A small object in front
of a large wall is a few percent of the pixels, so both tails landed on the
wall and the object clipped away. Rendering a frame and looking at it found
that; every test passed either way.
Verified with dora-cli 1.0.1: validate passes with both contracts injected,
the dataflow runs both nodes to a clean exit, and a composed frame was
rendered and inspected.
The two jobs each paid for a checkout, an apt-get update and an OpenCV shared
library install -- about twenty seconds apiece -- to run gates that together
take about a second. Merging them pays that once. The dora CLI is a static
binary pinned to DORA_VERSION, so it caches exactly.
`dora validate` matches a node manifest to a `path:` node by entrypoint. With
no manifest beside examples/source.py the root dora-node.yml was tried against
it, did not match its entrypoint, and warned -- which `strict_types: true`
turns into a non-zero exit, failing CI.
Declaring the source's output types in the new manifest rather than as
`output_types:` in dataflow.yml is also what makes them checked: an inline
annotation shadows the manifest, so the manifest would be injected but never
compared against the viewer's.
Verified with dora-cli 1.0.1: validate passes with both contracts injected, and
`CI=true SOURCE_FRAMES=30 dora run dataflow.yml --uv` runs both nodes to a
clean exit.
The repository, the Python package, the entrypoint and the manifest name all
now agree. `plot` was carried over from the upstream opencv-plot node and no
longer described anything here, so the module, the class and the environment
variables follow the node:
dora_plot/ -> dora_image_view/
dora_plot/plot.py -> dora_image_view/view.py
Plot -> View
PLOT_WIDTH/HEIGHT -> VIEW_WIDTH/HEIGHT
--plot-width/-height -> --view-width/-height
Breaking for anyone wiring `path: dora-plot` or setting PLOT_WIDTH; nothing is
tagged yet.
The example dataflow pulled opencv-video-capture and pyarrow-sender from
dora-hub, needed a webcam, and left `bbox` unwired because every bbox source
is a detector. examples/source.py emits an animated frame, the box around the
square in it, and a caption, so the dataflow exercises all three inputs with
nothing outside this checkout.
SOURCE_FRAMES bounds the run, which lets CI run the dataflow headless rather
than only validate it. Drops the dora-zed and dora-yolo wirings from the
README and trims AGENTS.md to what the code and README do not already say.
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_018WLVZCFFcCH1EpTXGfS9aD
The repository is dora-plot, but the package, the entrypoint, the manifest
name and the window title were all opencv-plot. Consumers wire the node by
`path:`, so the split name was visible in every dataflow.
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_018WLVZCFFcCH1EpTXGfS9aD
A display sink that overlays bounding boxes and text on an image input and
shows it in an OpenCV window. Based on opencv-plot from dora-hub, brought up
to the dora 1.0 node contract and packaged with uv.
Python rather than Rust: the opencv Rust crate generates its bindings from the
OpenCV headers on the build machine, so it needs libopencv-dev and libclang-dev
per machine and per architecture and does not cross-compile. Every dependency
here ships prebuilt wheels for linux-x86_64, linux-aarch64 and macos-arm64.
Covers every encoding the upstream node did — bgr8, rgb8, jpeg/jpg/jpe/bmp/
webp/png, yuv420 and avif — plus both bbox formats, the text overlay,
PLOT_WIDTH/PLOT_HEIGHT and headless operation under CI=true.
cristhian
