OpenCV getCPUFeaturesLine_0

getCPUFeaturesLine_0 returns a single string: the CPU feature line OpenCV detects on your machine. That's it. No inputs, nothing to tune - you run it and out comes something like SSE SSE2 SSE3 SSSE3 SSE4.1 SSE4.2 POPCNT AVX AVX2 FMA3 AVX512F ….

Why does this exist as a node? Because this pack auto-generates a node for every standalone OpenCV function, including the diagnostic ones. cv2.getCPUFeaturesLine() exists so you can check which SIMD instruction sets your OpenCV build can dispatch to, and this is that check, exposed in the graph.

Here's the honest value proposition: it's a curiosity and a diagnostic, not a workflow tool. SIMD features (SSE, AVX, AVX2, AVX512, NEON on ARM) are what make OpenCV's image operations fast - a blur or a threshold runs much quicker when the loop can process eight pixels at once. If you've ever wondered why your OpenCV nodes feel slow, or whether the CPU is being used properly, this string is the "is my CPU being respected" check.

The realistic use: you're debugging performance, or you've just switched machines / moved ComfyUI to a new box and want to confirm the install sees the full feature set. On x86_64 hardware, if you don't see at least AVX and AVX2 in the line, something odd is going on with your build or your virtualization layer. On ARM (Apple Silicon, Raspberry Pi), you're looking for NEON-family flags.

Inputs and output

No inputs. Output is string, the CPU feature line. That's the entire interface - wire it to a text node if you want to see it on the canvas, or just read it in the node output.

Installing

Part of geroldmeisinger/opencv-comfyui. ComfyUI Manager: search "opencv-comfyui". Or:

cd ComfyUI/custom_nodes
git clone https://github.com/geroldmeisinger/opencv-comfyui

Restart ComfyUI. The pack's requirements.txt installs opencv-contrib-python, numpy, and torch.

Common issues

Almost none - it's a read-only diagnostic with no failure modes beyond "OpenCV isn't installed," which would break the whole pack at load. The one thing to not do: expect this to change anything. It reports; it doesn't enable. If your feature line is missing AVX2, this node won't fix it - you'd need a different OpenCV build or a different machine.

If you're comparing it with its sibling getBuildInformation_0 (the full build report), think of this as the short version: one line about the CPU instead of a page about everything. For most people it's a fun five-minute look at their rig. For anyone tuning an OpenCV-heavy pipeline, it's a legitimate sanity check.