The accuracy of spectral recovery is directly affected by the spectral filter. Clarifying which parameters of the color filter will affect the spectral reconstruction accuracy can help us select the appropriate color filter and improve the reconstruction accuracy. Gaussian curve is used to simulate the spectral sensitivity curve of camera CCD channel. Taking color difference, goodness of fit coefficient and root mean square error as the result evaluation parameters, three, five and seven spectral filters with bandwidth of 20-60nm are selected for experiments. The influence of the number and bandwidth of camera channels on the spectral recovery results is explored by calculating the spectral recovery accuracy of Munsell spectral data set. The experimental results show that the number and bandwidth of spectral filters will affect the spectral recovery results.
KEYWORDS: Associative arrays, Visualization, Spatial filters, Color reproduction, Color vision, Printing, Information visualization, Contrast sensitivity, Visual system, Data modeling
Due to the increasing globalization of printing industry, remoting proofing will become the inevitable development trend. Cross-media color reproduction will occur in different color gamuts using remote proofing technologies, which usually leads to the problem of incompatible color gamut. In this paper, to achieve equivalent color reproduction between a monitor and a printer, a frequency-based spatial gamut mapping algorithm is proposed for decreasing the loss of visual color information. The design of algorithm is based on the contrast sensitivity functions (CSF), which exploited CSF spatial filter to preserve luminance of the high spatial frequencies and chrominance of the low frequencies. First we show a general framework for how to apply CSF spatial filter in retention of relevant visual information. Then we compare the proposed framework with HPMINDE, CUSP, Bala’s algorithm. The psychophysical experimental results indicated the good performance of the proposed algorithm.
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