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Tools and Measuring Instruments
Published in John L. Fetters, The Handbook of Lighting Surveys & Audits, 2018
Because the response of light-sensitive cells to the various wavelengths of the visible spectrum is quite different from that of the human eye, meters without color correction read accurately only for the kind of illumination with which they were calibrated, usually using a filament lamp at a color temperature of 2700K. Most illuminance meters are made with a color-correcting filter that changes the cell response to a spectral distribution with sufficient accuracy for audit purposes.
The Mastering Process
Published in Charles S. Swartz, Understanding Digital Cinema, 2004
Chris Carey, Bob Lambert, Bill Kinder, Glenn Kennel
Color correction decisions are made by displaying the video output on a calibrated studio (CRT) monitor set to D65 color temperature and a peak white of 35 foot Lamberts (ftL). The monitor is placed in front of a neutral gray wall or curtain and, lit to approximately 3 ftL (10%). The lighting in the mastering suite is subdued and the black level of the monitor is set with a PLUGE signal.5
Single image veiling glare removal
Published in Journal of Modern Optics, 2018
Zheng Zhang, Huajun Feng, Zhihai Xu, Qi Li, Yueting Chen
To correct the erroneous colour balance, a colour correction scheme is applied to change the visual appearance. The first constraint is the gray world assumption (14), which assumes that the average intensity of three colour channels of an RGB image should be equal. The second constraint is that the maximum signals in the image should be white due to the human visual perception theory (15). To meet the requirements of both constraints, a quadratic mapping (16) is used to adjust the colour balance: where colour correction parameters (a,b) are obtained by solving the equation: where calculates the mean value of an image and seeks the average value of the top 2% intensities in each channel. As is shown in Figure 2, the image after the colour correction has effectively removed the colour cast.
Advanced Framework for Effective Denoising the Enhanced Thermal Breast Image
Published in IETE Journal of Research, 2023
A. Arul Edwin Raj, M. Sundaram, T. Jaya
Then this processed V component is combined with H and S components to get an enhanced HSV image which is converted back to RGB image. The final color correction process is an important color image processing operation that converts a camera-dependent RGB color model into a standard color model. The thermal image color correction is performed by multiplying processed RGB values of the denoised thermogram by a color correction matrix which is calculated from the image. It [11] is learned from the literature that even though the color correction method improves the color quality of the image, it also amplifies the image noise. In order to overcome this challenge, [9] SVCC approach has been used in this work for achieving better color correction.