<abstract xmlns="http://www.w3.org/1999/xhtml">

<p>Digital cameras are photodetector arrays that respond to particular bands of the electromagnetic spectrum, and specifically those in the visible spectrum between 380 and 780 nm are the most commonly used. The main cameras function is store the image from an aesthetic point of view, when these are used in home applications. For this reason, several processes are used in image reconstruction to improve the visual appearance, even from the manufacturing process of sensor decreasing the possibility to obtain optical measurements with this cameras. However, digital cameras can also be used as optical measuring instruments knowing their features in depth. Therefore, in this paper is proposed a calibration method for monochrome digital camera using a monochromator and an automatic rotation system. In this way, the uniformity of the pixels response is verified, bad pixels are detected, and the sensitivity curve is obtained. The results show the advantages of the method to find regions of pixels turned off. Also, the value of sensitivity as a function of wavelength is obtained to verify the regions with significant changes of uniformity. This work aims to the prototyping of a color measurement system and it is very important a comprehensive understanding of the camera.</p>
</abstract>

Digital cameras are photodetector arrays that respond to particular bands of the electromagnetic spectrum, and specifically those in the visible spectrum between 380 and 780 nm are the most commonly used. The main cameras function is store the image from an aesthetic point of view, when these are used in home applications. For this reason, several processes are used in image reconstruction to improve the visual appearance, even from the manufacturing process of sensor decreasing the possibility to obtain optical measurements with this cameras. However, digital cameras can also be used as optical measuring instruments knowing their features in depth. Therefore, in this paper is proposed a calibration method for monochrome digital camera using a monochromator and an automatic rotation system. In this way, the uniformity of the pixels response is verified, bad pixels are detected, and the sensitivity curve is obtained. The results show the advantages of the method to find regions of pixels turned off. Also, the value of sensitivity as a function of wavelength is obtained to verify the regions with significant changes of uniformity. This work aims to the prototyping of a color measurement system and it is very important a comprehensive understanding of the camera.

Calibration Method for the Wavelength and Uniformity of Pixel Response in Photodetector Arrays

International Journal on Smart Sensing and Intelligent Systems

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.

Digital cameras are photodetector arrays that respond to particular bands of the electromagnetic spectrum, and specifically those in the visible spectrum...

Wavelength (nm)	P1 (%)	P2 (%)	P3 (%)	P4 (%)	P5 (%)	Margin (%)
380	53.34	53.95	53.56	53.78	53.70	0.62
400	63.33	61.86	65.23	65.44	63.52	3.58
420	71.15	70.64	72.82	70.74	69.75	3.07
440	77.50	75.92	75.33	76.05	74.95	2.55
460	79.70	82.51	82.83	81.34	79.45	3.39
480	84.35	84.73	86.25	83.23	83.53	3.02
500	87.98	89.80	89.78	89.45	88.78	1.82
520	93.61	92.64	94.40	92.27	93.87	2.13
540	95.13	95.90	96.91	97.45	94.78	2.67
560	99.87	99.35	98.29	98.04	98.07	1.83
580	98.02	98.79	98.84	100.00	100.00	1.98
600	99.26	98.23	99.80	98.71	98.07	1.72
620	99.73	99.67	98.34	98.68	98.50	1.39
640	94.84	95.38	95.80	95.05	97.37	2.53
660	89.98	90.09	89.93	90.13	91.01	1.09
680	86.70	89.26	87.22	86.27	89.00	2.98
700	85.73	83.66	82.46	83.01	83.67	3.27
720	78.47	77.22	78.23	78.72	76.97	1.74
740	69.53	70.47	70.32	70.95	71.12	1.60
760	63.61	64.32	66.50	63.67	66.72	3.11
780	60.26	59.40	59.78	58.43	59.26	1.83

Calibration Method for the Wavelength and Uniformity of Pixel Response in Photodetector Arrays

Article Category: Research-Article

Published Online: Sep 17, 2018

Page range: 1 - 8

DOI: https://doi.org/10.21307/ijssis-2018-008

Keywords
Camera calibration, monochromator, photodectors, uniformity pixel, wavelength calibration

© 2018 J.-S. Botero-Valencia et al., published by Sciendo

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.

Fig. 1

Fig. 2

Fig. 3

Fig. 4

Fig. 5

Fig. 6

Mean response and margin.

Calibration Method for the Wavelength and Uniformity of Pixel Response in Photodetector Arrays

Article Category: Research-Article

Published Online: Sep 17, 2018

Page range: 1 - 8

DOI: https://doi.org/10.21307/ijssis-2018-008

KeywordsCamera calibration, monochromator, photodectors, uniformity pixel, wavelength calibration

© 2018 J.-S. Botero-Valencia et al., published by Sciendo

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.

Fig. 1

Fig. 2

Fig. 3

Fig. 4

Fig. 5

Fig. 6

Mean response and margin.

Keywords
Camera calibration, monochromator, photodectors, uniformity pixel, wavelength calibration