Method to Correct Glass Window to SCE Measurement
AssigneeDatacolor Inc.
InventorsZhiling Xu, William Bishop
Life of this patent
Estimating the term…
Abstract
This disclosure describes a color measurement system for improved specular component excluded (SCE) measurements. The system incorporates an integrating sphere with an SCE sensor and light source, with a transparent window placed between the SCE sensor and the sample. A processor activates the light source, receives sensor values from reflected light off a sample, and obtains a measurement calibration factor. The system corrects SCE measurements using this calibration factor. The measurement calibration factor can include at least the transparent window's transmittance value, allowing for accurate color readings by compensating for the transparent material's influence on light transmission.
Claims16
A color measurement system comprising:
- an integrating sphere having at least one specular component excluded (SCE) sensor configured to output a signal in response to light incident thereupon and a light source, wherein a transparent material is disposed between the specular component excluded (SCE) sensor and the sample;
- and
- at least one processor having a memory and configured to:
- activate the light source so as to cause a beam of light to be directed into the sphere and provide illumination to a sample placed at the sample port of the integrating sphere;
- receive a value output by the SCE sensor generated in response to light that has been reflected off a sample;
- obtain at least one measurement calibration factor value;
- generate a corrected SCE measurement value using at least the SCE sensor output value and the at least one obtained measurement calibration factor;
- and
- output at least the corrected SCE measurement value.
A method of correcting a specular component excluded (SCE) color measurement, the method comprising:
- directing light from a light source into an integrating sphere, the integrating sphere having a specular component excluded (SCE) sensor positioned to receive light reflected from the sample through a glass window;
- receiving a measured specular component excluded (SCE) value (Rg) from the SCE sensor;
- obtaining a transmittance value (T) of the glass window;
- calculating a corrected specular component excluded (SCE) value (R) using the formula:
- R
- =
- Rg
- /
- (
- 2
-
- T
- -
- T
- 2
- *
-
- Rg
- )
- outputting the corrected specular component excluded (SCE) value (R).
A specular component excluded (SCE) color measurement apparatus comprising:
- an integrating sphere, the integrating sphere having a specular component excluded (SCE) sensor positioned to receive light reflected from the sample through a glass window;
- wherein a glass window is positioned between the specular component excluded (SCE) sensor and the sample;
- at least one local processor configured by code executing therein to:
- cause an illuminator to illuminate the sample;
- obtain a reflectance measurement value of the sample by receiving the output from the specular component excluded (SCE) sensor while the sample is illuminated;
- obtain a transmittance value (T) of the glass window from a remote data storage location;
- calculate a corrected specular component excluded (SCE) value;
- and
- outputting the corrected specular component excluded (SCE) value;
- at least one remote processor, configured by code executing therein to:
- receive at least the outputted corrected specular component excluded (SCE) value;
- and
- display at least corrected specular component excluded (SCE) value on a display device connected the at least one remote processor.
Dependencies are inferred from the claim text.