CropBackground GUI is an interactive tool for removing background pixels from hyperspectral or multichannel image cubes. Built with the AppBase + uihtml architecture (HTML/CSS/JS frontend, MATLAB backend).
Three cropping modes: - Threshold: min/max intensity sliders with live preview and draggable threshold lines on the distribution chart. - Selection: draw rectangle, polygon, or freehand regions directly on the heatmap (multi-shape, invert, clear). - Auto-Detect: automatic particle/cell detection using Otsu or adaptive thresholding with morphological cleanup and optional watershed separation (requires Image Processing Toolbox).
Additional features: - Spectral band selection: view mean spectrum and select wavelength ranges to use. - Preprocessing transforms (square, log, sqrt) before any method. - Full-resolution heatmap with zoom and pan. - Dark mode (Ctrl+D), jet colormap with colorbar. - Export cropped matrix and indices to workspace. - Includes demo with real plastic sample image and synthetic NIR spectra.
