Threshold Image (OpenCV)

How it fits

Typical backends

Caveats

• FallbackUnknown method values fall back silently to otsu.
• Parameter interactionvalue only applies when method is fixed; otsu and triangle compute the cutoff themselves.
• Parameter interactionblock_size is clamped to a minimum of 3 and silently rounded up to the next odd value; ignored by non-adaptive methods.
• Parameter interactionC is subtracted from the local mean in adaptive methods; positive values raise the threshold (shrink foreground), negative do the opposite; ignored by non-adaptive methods.
• Accuracyotsu assumes a roughly bimodal histogram and degrades on flat or low-contrast scenes; triangle is the better fallback for skewed unimodal distributions.
• I/O contractColour information is discarded before thresholding; the grayscale arm is always a single-channel GRAY image and the mask arm is a single-channel boolean foreground mask. The downstream connection picks the arm.
• State lifetimeAll parameters are captured once at first invocation; runtime changes require a redeploy.
• FallbackAn empty Image is returned unchanged.