I/WE CLAIM:
1. A sensor apparatus to determine a value of a chemical parameter
comprising:
a housing;
one or more light emitters positioned within the housing to emit light through an aperture of the housing, wherein the light to be emitted is to illuminate a color area of a structure that is separable from the housing; and
a color sensor positioned within the housing to capture light to be reflected through the aperture and to convert the light to be reflected to an initial digitized color space usable to determine a color shade of the color area, wherein the light to be reflected is to be captured independently at least of a dimension of the color area.
2. The sensor apparatus of claim 1, wherein the color sensor is to read the
color shade of the color area independently of a spacing between two or more color
areas, a number of color areas, a dimension of the structure, and a manufacturer of the
structure.
3. The sensor apparatus of claim 1, wherein the aperture is positioned at a narrow end of a cone portion of the housing, wherein the color sensor is positioned at a wide end of the cone portion of the housing, and wherein the one or more light emitters are positioned in the cone portion of the housing between the color sensor and the aperture to substantially shield the color sensor from ambient light.
4. The sensor apparatus of claim 1, further including a lens positioned in a cone portion of the housing between the color sensor and the aperture to substantially limit the field of view of the color sensor to that of the aperture.
5. The sensor apparatus of claim 1, further including a communication module to forward data to a mobile computing platform external to the housing, wherein the sensor apparatus is a disaggregated sensor.

6. The sensor apparatus of claim 1, further including a slit positioned adjacent the aperture and coupled with a cone portion of the housing to accommodate a swipe of the structure through the slit.
7. The sensor apparatus of claim 1, further including:
a command module to detect a user command that modulates a switch to read the color shade of the color area;
a timer module to detect an expiration of a timer to read the color shade of the color area; and
a demarcation module to detect a demarcation interval to read the color shade of the color area.
8. The sensor apparatus of claim 1, wherein the structure includes a
printed color reference and each color area includes a reference shade, and wherein
the sensor apparatus further includes a reference generation module that includes:
a reference identification module to set identification data of the printed color reference;
a parameter module to set one or more of a number of chemical parameters to be associated with a test strip, a name of each chemical parameter, a number of reference shades for each chemical parameter, and a value of each chemical parameter for each reference shade; and
a color space storage module to store a set of values of the initial digitized color space.
9. The sensor apparatus of claim 8, wherein the set of values of the initial digitized color space are to be stored in a two-dimensional matrix that includes a color space value set in a first dimension and a chemical parameter-reference shade set in a second dimension.
10. The sensor apparatus of claim 1, further including a normalization module to normalize a set of values of the initial digitized color space.
11. The sensor apparatus of claim 1, further including a reference retrieval module to retrieve a digitized color reference from data storage.

12. The sensor apparatus of claim 1, further including a color space
transformation module to convert the initial digitized color space to a final digitized
color space, wherein the color space transformation module includes:
an international commission of illumination (CIE) module to convert a Red-Blue-Green color space including a set of Red-Blue-Green values to a CIE XYZ color space including a set of XYZ values; and
a Lab module to convert the CIE color space including the set of CIE XYZ values to a Lab color space including a set of L,a,b values.
13. The sensor apparatus of claim 1, wherein the structure includes a test
strip and each color area includes a developed shade of the test strip, and wherein the
sensor apparatus further includes:
a match module to match a final digitized color space of a digitized color reference with a final digitized color space of a digitized test strip, wherein the match module is to determine a delta-E value indicative of a minimum distance of a set of L,a,b values of the developed shade from a set of reference L,a,b values of the reference shade;
a value identification module to identify a value of a chemical parameter for the developed shade when a match is found between the developed shade and the reference shade based the determination; and
a value storage module to store the value.
14. The sensor apparatus of any one of claims 1 to 13, wherein the match
module further includes:
a proximity module to make an identification of two smallest delta-E values indicative of two closest reference shades to the developed shade when a match is not found; and
an interpolation module to interpolate a reference shade between the two closest reference shades until a match is found with the developed shade, and to compute the value of the chemical parameter for the developed shade based on the match.

15. A method to determine a value of chemical parameter comprising:
providing one or more light emitters positioned within a housing to emit light
through an aperture of the housing, wherein the light to be emitted is to illuminate a color area of a structure that is separable from the housing; and
providing a color sensor positioned within the housing to capture light to be reflected through the aperture and to convert the light to be reflected to an initial digitized color space usable to determine a color shade of the color area, wherein the light to be reflected is to be captured independently at least of a dimension of the color area.
16. The method of claim 15, wherein the aperture is positioned at a narrow
end of a cone portion of the housing, wherein the color sensor is positioned at a wide
end of the cone portion of the housing, and wherein the one or more light emitters are
positioned in the cone portion of the housing between the color sensor and the
aperture to substantially shield the color sensor from ambient light.
17. The method of claim 15, wherein the structure includes a printed color
reference and each color area includes a reference shade, and wherein the method
further includes:
setting identification data of the printed color reference;
setting one or more of a number of chemical parameters to be associated with a test strip, a name of each chemical parameter, a number of reference shades for each chemical parameter, and a value of each chemical parameter for each reference shade; and
storing a set of values of the initial digitized color space.
18. The method of claim 15, further including converting the initial
digitized color space to a final digitized color space, wherein the method further
includes:
converting a Red-Blue-Green color space including a set of Red-Blue-Green values to an international commission of illumination (CIE) XYZ color space including a set of XYZ values; and
converting the CIE color space including the set of CIE XYZ values to a Lab color space including a set of L,a,b values.

19. The method of claim 15, wherein the structure includes a test strip and
each color area includes a developed shade of the test strip, and wherein the method
further includes:
matching a final digitized color space of a digitized color reference with a final digitized color space of a digitized test strip, wherein the match module is to determine a delta-E value indicative of a minimum distance of a set of L,a,b values of the developed shade from a set of reference L,a,b values of the reference shade;
identifying a value of a chemical parameter for the developed shade when a match is found between the developed shade and the reference shade based the determination; and
storing the value.
20. The method of any one of claims 15 to 19, further including:
identifying two smallest delta-E values indicative of two closest reference
shades to the developed shade when a match is not found;
interpolating a reference shade between the two closest reference shades until a match is found with the developed shade; and
computing the value of the chemical parameter for the developed shade based on the match.
21. At least one computer readable storage medium comprising one or
more instructions that when executed on a computing device cause the computing
device to:
emit light through an aperture of a housing, wherein the light to be emitted is to illuminate a color area of a structure that is separable from the housing; and
capture light to be reflected through the aperture and convert the light to be reflected to an initial digitized color space usable to determine a color shade of the color area, wherein the light to be reflected is to be captured independently at least of a dimension of the color area.
22. The at least one medium of claim 21, wherein the structure includes a
printed color reference and each color area includes a reference shade, and wherein
when executed the one or more instructions cause the computing device to:
set identification data of the printed color reference;

set one or more of a number of chemical parameters to be associated with a test strip, a name of each chemical parameter, a number of reference shades for each chemical parameter, and a value of each chemical parameter for each reference shade; and
store a set of values of the initial digitized color space.
23. The at least one medium of claim 21, wherein when executed the one
or more instructions cause the computing device to convert the initial digitized color
space to a final digitized color space by:
a conversion of a Red-Blue-Green color space including a set of Red-Blue-Green values to an international commission of illumination (CIE) XYZ color space including a set of XYZ values; and
a conversion of the CIE color space including the set of CIE XYZ values to a Lab color space including a set of L,a,b values.
24. The at least one medium of claim 21, wherein the structure includes a
test strip and each color area includes a developed shade of the test strip, and wherein
when executed the one or more instructions cause the computing device to:
match a final digitized color space of a digitized color reference with a final digitized color space of a digitized test strip, wherein the match is to determine a delta-E value indicative of a minimum distance of a set of L,a,b values of the developed shade from a set of reference L,a,b values of the reference shade;
identify a value of a chemical parameter for the developed shade when a match is found between the developed shade and the reference shade based the determination;
identify two smallest delta-E values indicative of two closest reference shades to the developed shade when a match is not found;
interpolate a reference shade between the two closest reference shades until a match is found with the developed shade; and
compute the value of the chemical parameter for the developed shade based on the match.
25. A sensor apparatus to determine a value of chemical parameter
comprising means for performing the method of any one of claims 15 to 19.