Method TryDetectBorderBackgroundColor

Namespace: LMKit.Media.Image

Assembly: LM-Kit.NET.dll

TryDetectBorderBackgroundColor(out Color32, float)

Attempts to estimate a uniform background color by analyzing only the image border (top and bottom rows, and left/right columns).

public bool TryDetectBorderBackgroundColor(out Color32 color, float minAccuracy = 0.85)

Parameters

color Color32: When the method returns true, contains the detected background color as an Color32 value. When the method returns false, this value is unspecified.
minAccuracy float: Minimum fraction (0..1) of border pixels that must support the detected color (per channel for RGB/ARGB32). Defaults to 0.85.

Returns

bool: true if a sufficiently uniform background color is found; otherwise false.

Remarks

Algorithm

Accumulate histograms over the border pixels only (perimeter scan).
For GRAY8: pick the most frequent gray level; accept if its frequency / perimeter ≥ minAccuracy.
For RGB/ARGB32: build per-channel histograms (alpha ignored), apply a 3-sample box smoothing, pick the max bin per channel, and require each channel’s frequency / perimeter ≥ minAccuracy.

Performance: O(perimeter) time; uses stack-allocated histograms to avoid GC pressure.

Notes: Works best when the background is roughly uniform near the border. For ARGB32 inputs, alpha is ignored (transparent borders are treated as their RGB values).

Exceptions