Spatial Masking Noise Floor Calibration in High Speed Multispectral Cotton Tuft Inspection Systems
Dynamic spatial masking calibration prevents costly false ejections by separating tuft density shadows from foreign polymer absorption signals.
Reflectance Ratio
Whiteness Measurement
Quantitative comparison between the light reflected by a sample and the light reflected by a standard white reference. A reflectance ratio determines the brightness and whiteness of bleached fabrics before they enter the dyeing phase. This metric is expressed as a decimal or a percentage.
Calculation Basis
Colour measurement relies on this value to calculate the K over S values in the Kubelka-Munk theory. The reflectance ratio at specific wavelengths allows the lab to predict how a dye will appear on a given substrate. Low reflectance in the blue spectrum often indicates a yellowish tint that may require optical brighteners.
Quality Standard
Quality control teams use the measurement to ensure consistency across different production lots. If the reflectance ratio of a new batch of grey goods is lower than the standard, the dyer must adjust the recipe to reach the target shade. This adjustment prevents the production of off-shade garments.
Instrumental Assessment
Instrumental assessment provides a more objective result than visual inspection under a light box. Because the reflectance ratio is a mathematical value, it can be shared digitally between a mill in one country and a buyer in another. This digital communication speeds up the approval process for lab dips.