opencv_brightness_contrast · Brightness/contrast
Linear gain/bias adjustment of brightness and contrast.
Node-Guide
opencv_clahe · CLAHE
Contrast-limited adaptive histogram equalization: local enhancement with controllable noise amplification.
opencv_connected_components · Connected components
Labels each connected region of a binary image with an integer id.
opencv_denoise · Non-local means
fastNlMeansDenoising: patch-similarity denoise with the best detail retention.
opencv_distance_transform · Distance transform
Distance field of foreground pixels to the nearest background — the intermediate for skeletons and width.
opencv_equalize_hist · Histogram equalization
Global histogram equalization: stretches dynamic range.
opencv_flood_fill · Flood fill
Floods from a seed point by similarity — selections and magic-wand behavior.
opencv_gamma_correct · Gamma correction
Power-law adjustment (out = in^gamma) — display matching and lifting shadows.
opencv_grabcut · GrabCut
Iterated graph-cut segmentation initialized by a rectangle or mask — the classic interactive cutout.
opencv_invert · Invert
Pixel inversion (255 - x): negatives and mask inversion.