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Balogh: /* 2. Color Matching Demo software */

2019-03-23T22:23:59Z

2. Color Matching Demo software

← Staršia verzia		Verzia z 22:23, 23. marec 2019
Riadok 20:		Riadok 20:


	* TCS230 sensor: [http://ap.~~urpi.fei.stuba~~.sk/sscim/code/TCS230Demo02.bs2 BASIC Stamp II code]		* TCS230 sensor: [http://senzor.robotika.sk/sscim/code/TCS230Demo02.bs2 BASIC Stamp II code]
	* ColorPAL sensor [http://~~ap.urpi.fei~~.~~stuba~~.sk/sscim/code/ColorPalDemo02.ino Arduino code]		* ColorPAL sensor [http://senzor.robotika.sk/sscim/code/ColorPalDemo02.ino Arduino code]
	* 2014: [http://learn.parallax.com/colorpal-arduino-demo Arduino demo + code]		* 2014: [http://learn.parallax.com/colorpal-arduino-demo Arduino demo + code]
	* 2014: [http://parallax.com/downloads/colorpal-color-matching-program-and-basic-stamp-sample-files Demo pre BS2]		* 2014: [http://parallax.com/downloads/colorpal-color-matching-program-and-basic-stamp-sample-files Demo pre BS2]

Balogh: /* 1. Basic demonstration */

2019-03-23T22:22:06Z

1. Basic demonstration

← Staršia verzia		Verzia z 22:22, 23. marec 2019
Riadok 8:		Riadok 8:
	* TCS2300 description https://www.waveshare.com/wiki/Color_Sensor		* TCS2300 description https://www.waveshare.com/wiki/Color_Sensor

			Poznamka: ak chceme pri senzore TCS3200 pouzit R,G a B hodnoty v obvyklom rozsahu 0-255, pouzijeme
			funkciu map():

			//Remaping the value of the frequency to the RGB Model of 0 to 255
			frequency = map(frequency, 25,70,255,0);

	== 2. Color Matching Demo software ==		== 2. Color Matching Demo software ==

Balogh: /* Software for Color Sensors */

2019-03-23T22:09:53Z

Software for Color Sensors

← Staršia verzia		Verzia z 22:09, 23. marec 2019
Riadok 3:		Riadok 3:
	== 1. Basic demonstration ==		== 1. Basic demonstration ==

	* TCS230 sensor: [http://ap.~~urpi.fei.stuba~~.sk/sscim/code/TCS230Demo01.bs2 BASIC Stamp II code]		* TCS230 sensor: [http://senzor.robotika.sk/sscim/code/TCS230Demo01.bs2 BASIC Stamp II code]
	* ColorPAL sensor [http://ap.~~urpi~~.~~fei~~.~~stuba~~.sk/sscim/code/~~ColorPalDemo01~~.ino Arduino code]		* ColorPAL sensor: http://senzor.robotika.sk/sscim/code/ColorPalDemo01.ino Arduino code]
			* TCS3200 sensor: [http://senzor.robotika.sk/sscim/code/TCS3200demo01.ino Arduino code]
	* TCS2300 description https://www.waveshare.com/wiki/Color_Sensor		* TCS2300 description https://www.waveshare.com/wiki/Color_Sensor



	== 2. Color Matching Demo software ==		== 2. Color Matching Demo software ==

Balogh: /* 1. Basic demonstration */

2019-03-22T23:24:49Z

1. Basic demonstration

← Staršia verzia		Verzia z 23:24, 22. marec 2019
Riadok 5:		Riadok 5:
	* TCS230 sensor: [http://ap.urpi.fei.stuba.sk/sscim/code/TCS230Demo01.bs2 BASIC Stamp II code]		* TCS230 sensor: [http://ap.urpi.fei.stuba.sk/sscim/code/TCS230Demo01.bs2 BASIC Stamp II code]
	* ColorPAL sensor [http://ap.urpi.fei.stuba.sk/sscim/code/ColorPalDemo01.ino Arduino code]		* ColorPAL sensor [http://ap.urpi.fei.stuba.sk/sscim/code/ColorPalDemo01.ino Arduino code]
			* TCS2300 description https://www.waveshare.com/wiki/Color_Sensor

	== 2. Color Matching Demo software ==		== 2. Color Matching Demo software ==

Balogh: /* 2. Color Matching Demo software */

2016-03-13T21:08:36Z

2. Color Matching Demo software

← Staršia verzia		Verzia z 21:08, 13. marec 2016
Riadok 10:		Riadok 10:

	Following Arduino code works with an original Parallax (or PhiPi) ColorDemo.exe program available at		Following Arduino code works with an original Parallax (or PhiPi) ColorDemo.exe program available at
	the following address: ~~http~~://www.parallax.com/~~Portals~~/0/~~Downloads~~/~~docs~~/~~prod/sens/ColorPAL_programs~~.zip		the following address: https://www.parallax.com/sites/default/files/downloads/28380-ColorPAL-Color-Matching-Program-BS-Sample-Files.zip


	* TCS230 sensor: [http://ap.urpi.fei.stuba.sk/sscim/code/TCS230Demo02.bs2 BASIC Stamp II code]		* TCS230 sensor: [http://ap.urpi.fei.stuba.sk/sscim/code/TCS230Demo02.bs2 BASIC Stamp II code]

Balogh na 12:13, 20. marec 2014

2014-03-20T12:13:19Z

← Staršia verzia		Verzia z 12:13, 20. marec 2014
Riadok 15:		Riadok 15:
	* ColorPAL sensor [http://ap.urpi.fei.stuba.sk/sscim/code/ColorPalDemo02.ino Arduino code]		* ColorPAL sensor [http://ap.urpi.fei.stuba.sk/sscim/code/ColorPalDemo02.ino Arduino code]
	* 2014: [http://learn.parallax.com/colorpal-arduino-demo Arduino demo + code]		* 2014: [http://learn.parallax.com/colorpal-arduino-demo Arduino demo + code]
			* 2014: [http://parallax.com/downloads/colorpal-color-matching-program-and-basic-stamp-sample-files Demo pre BS2]

Balogh: /* 2. Color Matching Demo software */

2014-03-20T12:07:04Z

2. Color Matching Demo software

← Staršia verzia		Verzia z 12:07, 20. marec 2014
Riadok 14:		Riadok 14:
	* TCS230 sensor: [http://ap.urpi.fei.stuba.sk/sscim/code/TCS230Demo02.bs2 BASIC Stamp II code]		* TCS230 sensor: [http://ap.urpi.fei.stuba.sk/sscim/code/TCS230Demo02.bs2 BASIC Stamp II code]
	* ColorPAL sensor [http://ap.urpi.fei.stuba.sk/sscim/code/ColorPalDemo02.ino Arduino code]		* ColorPAL sensor [http://ap.urpi.fei.stuba.sk/sscim/code/ColorPalDemo02.ino Arduino code]
			* 2014: [http://learn.parallax.com/colorpal-arduino-demo Arduino demo + code]


	[[Obrázok:ColorMatchDemoExe.png\|center]]		[[Obrázok:ColorMatchDemoExe.png\|center]]

Balogh na 10:42, 20. marec 2013

2013-03-20T10:42:23Z

Balogh: /* 4. Calculations */

2013-03-20T09:59:51Z

4. Calculations

← Staršia verzia		Verzia z 09:59, 20. marec 2013
Riadok 21:		Riadok 21:

	=== TCS230 ===		=== TCS230 ===


			Because even the completely black surface reflex some light under white LED illumination, the light response from a completely black subject will be non-zero. For this reason, the black response for each color component has to be determined experimentally, so that it, too, can be subtracted from the overall response. The three components thus measured (with an ambient reference subtracted), Kr, Kg, and Kb, are known as the “black reference”. A black reference is typically obtained only once before each measurement session.

			The TCS230 light sensor colored photodiodes does not respond equally to the red, green, and blue wavelengths. So, in addition to the ambient reference and black reference, it is also necessary to take a “white reference”, wherein the TCS230 is presented with a completely white surface. Again, after subtracting the ambient lighting, the red, green, and blue components of this reference will be called, Wr, Wg, and Wb. Now we have a way of determining a subject’s actual color as a percentage of the difference between the white and black references. This percentage can be expressed as a value between 0 (0%) and 255 (100%), as follows for red, say:
			Cr = 255 . (Ur – Kr) / (Wr – Kr),
			where Ur is the uncorrected (except for ambient) reading, and Cr is the corrected reading.


Riadok 28:		Riadok 35:

	Because the LED and sensor sit next to each other on the ColorPAL’s circuit board, and because the plastic snorkel itself reflects some light back (primarily from its threads), the light response from a completely black subject will be non-zero. For this reason, the black response for each color component has to be determined experimentally, so that it, too, can be subtracted from the overall response. The three components thus measured (with an ambient reference subtracted), Kr, Kg, and Kb, are known as the “black reference”. A black reference is typically obtained only once before each measurement session. The TSL13T light sensor does not respond equally to the red, green, and blue LEDs, and those LEDs don’t put out equal amounts of light at the red, green, and blue wavelengths. So, in addition to the ambient reference and black reference, it is also necessary to take a “white reference”, wherein the ColorPAL is presented with a completely white surface. Again, after subtracting the ambient lighting, the red, green, and blue components of this reference will be called, Wr, Wg, and Wb. Now we have a way of determining a subject’s actual color as a percentage of the difference between the white and black references. This percentage can be expressed as a value between 0 (0%) and 255 (100%), as follows for red, say:		Because the LED and sensor sit next to each other on the ColorPAL’s circuit board, and because the plastic snorkel itself reflects some light back (primarily from its threads), the light response from a completely black subject will be non-zero. For this reason, the black response for each color component has to be determined experimentally, so that it, too, can be subtracted from the overall response. The three components thus measured (with an ambient reference subtracted), Kr, Kg, and Kb, are known as the “black reference”. A black reference is typically obtained only once before each measurement session. The TSL13T light sensor does not respond equally to the red, green, and blue LEDs, and those LEDs don’t put out equal amounts of light at the red, green, and blue wavelengths. So, in addition to the ambient reference and black reference, it is also necessary to take a “white reference”, wherein the ColorPAL is presented with a completely white surface. Again, after subtracting the ambient lighting, the red, green, and blue components of this reference will be called, Wr, Wg, and Wb. Now we have a way of determining a subject’s actual color as a percentage of the difference between the white and black references. This percentage can be expressed as a value between 0 (0%) and 255 (100%), as follows for red, say:
	Cr = 255 % (Ur – Kr) / (Wr – Kr),		Cr = 255 . (Ur – Kr) / (Wr – Kr),
	where Ur is the uncorrected (except for ambient) reading, and Cr is the corrected reading.		where Ur is the uncorrected (except for ambient) reading, and Cr is the corrected reading.

Balogh: /* 4. Calculations */

2013-03-20T09:54:41Z

4. Calculations

← Staršia verzia		Verzia z 09:54, 20. marec 2013
Riadok 19:		Riadok 19:
	== 4. Calculations ==		== 4. Calculations ==

	Color matching is done using a "minimax" approach in the RGB color space. In this method, the distance between two colors is the absolute value of the difference between the RGB component that differs most:
			=== TCS230 ===


			=== ColorPAL ===

			The sensor outputs a voltage proportional to all the light that it sees, weighted by the above curve. Therefore, when a subject is illuminated with a red LED only, it will respond with a voltage proportional to the red component of the subject’s color, and similarly with blue and green. When there is ambient light mixed in with the LED’s illumination, its effect can be eliminated by sampling first without any LEDs turned on, then subtracting this reading, in turn, from each of the red, green, and blue components. This reference measurement should be taken before each color measurement to eliminate any effects from varying ambient conditions. In the paragraphs that follow, it will be assumed that an ambient reference is taken and subtracted from each measurement discussed.

			Because the LED and sensor sit next to each other on the ColorPAL’s circuit board, and because the plastic snorkel itself reflects some light back (primarily from its threads), the light response from a completely black subject will be non-zero. For this reason, the black response for each color component has to be determined experimentally, so that it, too, can be subtracted from the overall response. The three components thus measured (with an ambient reference subtracted), Kr, Kg, and Kb, are known as the “black reference”. A black reference is typically obtained only once before each measurement session. The TSL13T light sensor does not respond equally to the red, green, and blue LEDs, and those LEDs don’t put out equal amounts of light at the red, green, and blue wavelengths. So, in addition to the ambient reference and black reference, it is also necessary to take a “white reference”, wherein the ColorPAL is presented with a completely white surface. Again, after subtracting the ambient lighting, the red, green, and blue components of this reference will be called, Wr, Wg, and Wb. Now we have a way of determining a subject’s actual color as a percentage of the difference between the white and black references. This percentage can be expressed as a value between 0 (0%) and 255 (100%), as follows for red, say:
			Cr = 255 % (Ur – Kr) / (Wr – Kr),
			where Ur is the uncorrected (except for ambient) reading, and Cr is the corrected reading.


			=== Color Matching ===

			'''Color matching''' is done using a "minimax" approach in the RGB color space. In this method, the distance between two colors is the absolute value of the difference between the RGB component that differs most:

	Di = max{\|R - Ri\|, \|G - Gi\|, \|B - Bi\|}		Di = max{\|R - Ri\|, \|G - Gi\|, \|B - Bi\|}

	where R, G and B are the red, green, and blue coordinates of the color being scanned; and Ri, Gi and Bi are the coordinates of stored color. The color with the closest match is taken to be the one whose is the smallest, i.e. minimizing the maximum difference. Hence the term "minimax".		where R, G and B are the red, green, and blue coordinates of the color being scanned; and Ri, Gi and Bi are the coordinates of stored color. The color with the closest match is taken to be the one whose is the smallest, i.e. minimizing the maximum difference. Hence the term "minimax".



	== 3. Processing software ==		== 3. Processing software ==

← Staršia verzia		Verzia z 10:42, 20. marec 2013
Riadok 3:		Riadok 3:
	== 1. Basic demonstration ==		== 1. Basic demonstration ==

	* TCS230 sensor: [http://ap.urpi.fei.stuba.sk/sscim/TCS230Demo01.bs2 BASIC Stamp II code]		* TCS230 sensor: [http://ap.urpi.fei.stuba.sk/sscim/code/TCS230Demo01.bs2 BASIC Stamp II code]
	* ColorPAL sensor [http://ap.urpi.fei.stuba.sk/sscim/ColorPalDemo01.ino Arduino code]		* ColorPAL sensor [http://ap.urpi.fei.stuba.sk/sscim/code/ColorPalDemo01.ino Arduino code]


Riadok 12:		Riadok 12:
	the following address: http://www.parallax.com/Portals/0/Downloads/docs/prod/sens/ColorPAL_programs.zip		the following address: http://www.parallax.com/Portals/0/Downloads/docs/prod/sens/ColorPAL_programs.zip

	* TCS230 sensor: [http://ap.urpi.fei.stuba.sk/sscim/TCS230Demo02.bs2 BASIC Stamp II code]		* TCS230 sensor: [http://ap.urpi.fei.stuba.sk/sscim/code/TCS230Demo02.bs2 BASIC Stamp II code]
	* ColorPAL sensor [http://ap.urpi.fei.stuba.sk/sscim/ColorPalDemo02.ino Arduino code]		* ColorPAL sensor [http://ap.urpi.fei.stuba.sk/sscim/code/ColorPalDemo02.ino Arduino code]

	[[Obrázok:ColorMatchDemoExe.png\|center]]		[[Obrázok:ColorMatchDemoExe.png\|center]]
Riadok 49:		Riadok 49:
	== 3. Processing software ==		== 3. Processing software ==

	* PC software: [http://ap.urpi.fei.stuba.sk/sscim/ColorSensorDemo03.pde Processing code]		* PC software: [http://ap.urpi.fei.stuba.sk/sscim/code/ColorSensorDemo03.pde Processing code]
	* TCS230 sensor: [http://ap.urpi.fei.stuba.sk/sscim/TCS230Demo03.bs2 BASIC Stamp II code]		* TCS230 sensor: [http://ap.urpi.fei.stuba.sk/sscim/code/TCS230Demo03.bs2 BASIC Stamp II code]
	* ColorPAL sensor [http://ap.urpi.fei.stuba.sk/sscim/ColorPalDemo03.ino Arduino code]		* ColorPAL sensor [http://ap.urpi.fei.stuba.sk/sscim/code/ColorPalDemo03.ino Arduino code]

	[[Obrázok:ColorProcessingDemo.png\|center]]		[[Obrázok:ColorProcessingDemo.png\|center]]