find_border_alpha_gaps: Find Border Alpha Gaps

In rayimage: Image Processing for Simulated Cameras

Find Border Alpha Gaps

Description

Internal helper that classifies which low-alpha pixels are part of the exterior border region. Pixels below alpha_threshold are considered low alpha. The algorithm starts from low-alpha pixels on the image boundary and performs an 8-connected flood fill through other low-alpha pixels. Low-alpha regions enclosed by pixels at or above alpha_threshold are not reached, so they are protected from fill_alpha_gaps().

Usage

find_border_alpha_gaps(alpha, alpha_threshold = 0.25)

Arguments

alpha	Numeric alpha matrix.
alpha_threshold	Default 0.25. Pixels below this alpha are considered low-alpha gap pixels.

Value

Logical matrix marking low-alpha pixels connected to the image exterior.

rayimage documentation built on June 12, 2026, 5:06 p.m.