RPoulsonPsych221Project - Revision history

imported>Psych2012: /* Appendix I */

2012-03-22T05:00:30Z

Appendix I

← Older revision		Revision as of 05:00, 22 March 2012
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	*Note that the image of the Sellaio face data is included in the zip file for convenience purposes only. One would need to adapt the source load code for individual use.		*Note that the image of the Sellaio face data is included in the zip file for convenience purposes only. One would need to adapt the source load code for individual use.
	<br />		<br />

			Just In Case (Slides): [http://white.stanford.edu/teach/index.php/File:Psych211_Presentation_RPoulson.pdf#filelinks\|Hyperspectral Image, Illuminant Changes, and Color Constancy]

	The code in the code archive is described above in the implementation section. In addition, there are comments at the beginning of every function to describe its purpose.		The code in the code archive is described above in the implementation section. In addition, there are comments at the beginning of every function to describe its purpose.

imported>Psych2012: /* References */

2012-03-22T04:52:12Z

References

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	*Gevers, T., & Gijsenij, A. (2011) ''Color Constancy''. Retrieved from: http://colorconstancy.com/		*Gevers, T., & Gijsenij, A. (2011) ''Color Constancy''. Retrieved from: http://colorconstancy.com/
	*Psych 221 Lecture notes (2012)		*Psych 221 Lecture notes (2012)
	*ISET Software Libraries.

	<br />		<br />

	Additionally, I would like to extend special thanks to Dr. Joyce Farrell for all her help on the project. It was very much appreciated.		Additionally, I would like to extend special thanks to Dr. Joyce Farrell for all her help on the project. It was very much appreciated.

			<br />
			All code was built in Matlab upon ISET functions.

	=Appendix I=		=Appendix I=

imported>Psych2012: /* References */

2012-03-22T04:51:31Z

References

← Older revision		Revision as of 04:51, 22 March 2012
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	*Gevers, T., & Gijsenij, A. (2011) ''Color Constancy''. Retrieved from: http://colorconstancy.com/		*Gevers, T., & Gijsenij, A. (2011) ''Color Constancy''. Retrieved from: http://colorconstancy.com/
	*Psych 221 Lecture notes (2012)		*Psych 221 Lecture notes (2012)
			*ISET Software Libraries.

	<br />		<br />

imported>Psych2012: /* Implementation */

2012-03-22T04:50:15Z

Implementation

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	*calculateAllImageDeltaE.m: This function takes the XYZ value of the image under the known illuminant, the image under the ideal illuminant and the white point to find and return the Delta E values for the entire image.		*calculateAllImageDeltaE.m: This function takes the XYZ value of the image under the known illuminant, the image under the ideal illuminant and the white point to find and return the Delta E values for the entire image.
			<br />

			Please note that this project was built upon ISET functions. These include, but are not limited to: sceneSet and related scene manipulation functions, sceneAdjustLuminance, RGB2XWFormat, XW2RGBFormat, vcReadSpectra, and others.

	=Results=		=Results=

imported>Psych2012: /* Implementation */

2012-03-21T23:29:08Z

Implementation

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	equation to find a column-by-column transformation in the form of a diagonal.		equation to find a column-by-column transformation in the form of a diagonal.

	*paintingIllumination.m: This is the function that calls all others. In current form, it takes the parameter of the type of light you want to start with in ~~file~~ form, and displays an image that starts with that type of light and is color balanced for daylight.		*paintingIllumination.m: This is the function that calls all others. In current form, it takes the parameter of the type of light you want to start with in filename form, and displays an image that starts with that type of light and is color balanced for daylight.

	*getSampleXYZ.m: This a function that takes the XYZ values for a version of the Sellaio Face image and returns 5 points in an array for a point by point calculation of the Delta E values.		*getSampleXYZ.m: This a function that takes the XYZ values for a version of the Sellaio Face image and returns 5 points in an array for a point by point calculation of the Delta E values.

imported>Psych2012: /* Implementation */

2012-03-21T23:28:25Z

Implementation

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	*createFullInnocentTransform.m: This function takes the XYZ values of the image we have and the image we want, creating a transform from the inverse multiplication of the XYZ values on one to the other.		*createFullInnocentTransform.m: This function takes the XYZ values of the image we have and the image we want, creating a transform from the inverse multiplication of the XYZ values on one to the other.

	*CreateFullImageXYZTransform.m: This is ImagEval ~~Consult’s~~ s_XYZsceneIlluminantTransforms.m slightly altered to be a function that accepts as a parameter the current type of lighting on the painting in the form of a filename. The output is a transform created by using the entire Sellaio image under both lights and solving the		*CreateFullImageXYZTransform.m: This is ImagEval Consultants’ s_XYZsceneIlluminantTransforms.m slightly altered to be a function that accepts as a parameter the current type of lighting on the painting in the form of a filename. The output is a transform created by using the entire Sellaio image under both lights and solving the
	<math>		<math>

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	equation to find a full 3x3 transformation.		equation to find a full 3x3 transformation.

	*CreateDiagonalImageXYZTransform.m: This is ImagEval ~~Consult’s~~ s_XYZsceneIlluminantTransforms.m slightly altered to be a function that accepts as a parameter the current type of lighting on the painting in the form of a filename. The output is a transform created by using the entire Sellaio image under both lights and solving the		*CreateDiagonalImageXYZTransform.m: This is ImagEval Consultants' s_XYZsceneIlluminantTransforms.m slightly altered to be a function that accepts as a parameter the current type of lighting on the painting in the form of a filename. The output is a transform created by using the entire Sellaio image under both lights and solving the
	<math>		<math>

imported>Psych2012: /* Conclusions */

2012-03-21T23:25:53Z

Conclusions

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	<br />		<br />

	Curiously, the full transform outperformed the diagonal in the Full Image Scaling, but resulted in a worse result in the Simple White Point Scaling. I believe this problem came from my naive approach at creating the full 3x3 matrix in the Simple White Point condition. My formulation involved ~~sample~~ several white points, which I believe only served to propagate any error already arising from the sampling of one white point. If I were able to do the project again, I would most certainly formulate this transformation condition in another way.		Curiously, the full transform outperformed the diagonal in the Full Image Scaling, but resulted in a worse result in the Simple White Point Scaling. I believe this problem came from my naive approach at creating the full 3x3 matrix in the Simple White Point condition. My formulation involved sampling several white points, which I believe only served to propagate any error already arising from the sampling of one white point. If I were able to do the project again, I would most certainly formulate this transformation condition in another way.
	<br />		<br />

imported>Psych2012: /* Full Image */

2012-03-21T23:24:42Z

Full Image

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	*Fluorescent11 - 1.8634		*Fluorescent11 - 1.8634
	*FluorescentOffice - 3.2820		*FluorescentOffice - 3.2820
	*~~Tung~~ - 2.5934		*Tungsten - 2.5934

	White Point, Full		White Point, Full
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	*Tungsten - 0.7635		*Tungsten - 0.7635
	<br />		<br />

	===Example of the Five Data Points ===		===Example of the Five Data Points ===
	<br />		<br />

imported>Psych2012: /* Appendix I */

2012-03-21T23:17:08Z

Appendix I

← Older revision		Revision as of 23:17, 21 March 2012
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	The Matlab Code Archive: [[File:Code-Psych221.zip]]		The Matlab Code Archive: [[File:Code-Psych221 2.zip]]
	*Note that the image of the Sellaio face data is ~~not~~ included in the zip file.		*Note that the image of the Sellaio face data is included in the zip file for convenience purposes only. One would need to adapt the source load code for individual use.
	<br />		<br />

	The code in the code archive is described above in the implementation section. In addition, there are comments at the beginning of every function to describe its purpose.		The code in the code archive is described above in the implementation section. In addition, there are comments at the beginning of every function to describe its purpose.

imported>Psych2012: /* Appendix I */

2012-03-21T23:13:31Z

Appendix I

← Older revision		Revision as of 23:13, 21 March 2012
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	The Matlab Code Archive: [[File:Code-Psych221.zip]]		The Matlab Code Archive: [[File:Code-Psych221.zip]]
			*Note that the image of the Sellaio face data is not included in the zip file.
	<br />		<br />

	The code in the code archive is described above in the implementation section. In addition, there are comments at the beginning of every function to describe its purpose.		The code in the code archive is described above in the implementation section. In addition, there are comments at the beginning of every function to describe its purpose.