US 2013/0293702 A1Published application

Multispectral imaging color measurement system and method for processing imaging signals thereof

AssigneeThe Hong Kong Research Institute of Textiles and Apparel Limited

InventorsHaozhong Xin, Sijie Shao, Huiliang Shen

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Abstract

A multispectral imaging color measurement system, comprising a dark room, a sample platform and an imaging device for capturing said object being measured; a controllable illumination device, a filter wheel unit, an imaging signal processing unit and an electronic control unit. A method for processing imaging signals of the multispectral imaging color measurement is also proposed. The multispectral imaging color measurement system and the method for processing imaging signals thereof can overcome the inaccuracy of traditional digital imaging systems and the limits of spectrophotometer systems and provide users in the textile industry with highly accurate color measurement and evaluation.

Claims10

Dependent claims

A multispectral imaging color measurement system comprising a dark room of a confined space for multispectral imaging, a sample platform located in said dark room for laying and fastening an object being measured, an imaging device for capturing said object being measured, a controllable illumination device, a filter wheel unit, an imaging signal processing unit and an electronic control unit;

said controllable illumination device being located in the dark room comprising at least one lighting tube arranged symmetrically above the object while pointing towards the object;
said filter wheel unit being located between said imaging device and said object for filtering light emitted from said controllable illumination device and reflected by said object;
said imaging signal processing unit is located within said imaging device for calibrating and reconstructing reflectance of images captured by said imaging device;
said electronic control unit having communication connections with said controllable illumination device, said filter wheel unit and said imaging device for controlling said controllable illumination device, said filter wheel unit and said imaging device when in operation.

1 more element

An imaging signal processing method comprising

correcting geometric error caused by optical lens or filters;
correcting brightness of imaging signal in each optical channel;
estimating an exposure time of a linear working range for a sensor, setting said sensor to operate within said exposure time to convert incident light signal into digital imaging signal;
correcting image noise caused by inherent noise source in said sensor;
calibrating multi-channel images in the optical channels that are captured through different filters to eliminate offset of content caused by relative misaligned position of the filters in the filter wheel unit, differences in refractive indexes in the filters, a slight objective distance shift between the filters in the filter wheel unit and the object being measured;
correcting overlapping imaging signal caused by overlapping effect in each channel;
and reconstructing reflectance of the imaging signal;
and
generating a spectral reflectance image of the object being measured.

6 more elements

Dependencies are inferred from the claim text.

Facts

Application: 13/882,508Filed 24 Aug 2011
Priority: CN 201010539818.21 Nov 2010
Published: 7 Nov 2013
Term ends: Not estimatedThe source records don’t support an estimate.

Classification15 codes

G01J 3/52
Measurement of colour; Colour measuring devices, e.g. colorimeters: using colour charts
G01J 3/0208
Optical elements not provided otherwise, e.g. optical manifolds, diffusers, windows: using focussing or collimating elements, e.g. lenses or…
G01J 3/0216
Optical elements not provided otherwise, e.g. optical manifolds, diffusers, windows: using light concentrators or collectors or condensers
G01J 3/0235
Optical elements not provided otherwise, e.g. optical manifolds, diffusers, windows: using means for replacing an element by another, for…