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Color calibration method providing uniform distribution of color difference throughout the whole vision gamut

Kretkowski M., Shimodaira Y., Jabłoński R.

Journal of Automation Mobile Robotics and Intelligent Systems

2009

Vol. 3, No. 4

213-216

Accurate reproduction of colors requires methods of calibrating a digital camera. In case of a camera which employs filters with spectral characteristics deduced from the color matching functions, a set of reference calibration colors must be used to obtain a conversion matrix between raw data from imaging sensor and colorimetric tristimulus values XYZ, from which the output signal is formed. The XYZ camera used for testing of the presented calibration me thod is capable of acquiring colors accurately in the whole vision gamut due to its filters. However, the well-established color references, like the Macbeth Chart or other similar color checkers, are not entirely sufficient for the calibration due to their enclosure in smaller color gamut (HDTV - High Definition Television) than the whole vision gamut. The presented method is based on choosing the calibration colors by their spectral distributions, which are related with the spectral characteristics of the filters. The obtained result was found to be ?E=1.57 for the designed colors.

Measurement method of shape deviation of cylindrical micro-lenses using focused laser beam and reference axis

Woźniak A., Kretkowski M., Jabłoński R.

Metrology and Measurement Systems

2007

Vol. 14, nr 3

351-360

Constant progress in application of micro-lenses in many modern optical systems caused a continuous increase of the need to investigate methods of their measurement. A new method of measurement of shape deviation of such cylindrical micro-lens has been proposed. The concept is based on measurements of the distance between a reference and the lens surface in various directions. The reference points are established by the rotation axis of a precise rotary table. Detection of the surface of the measured object has been done using a focused laser beam moved by a high-resolution piezotranslator. In the paper we will show the results from our first measurements and we will discuss the advantages and disadvantages of our method as well as the method’s accuracy.