Abstract
The standardization of grayscale display is essentially significant for image signal communication, transmission, and terminal reading. The key step of this standardization is establishing a traceable equipment of grayscale. As a relative value, grayscale is transferred to two different absolute values to satisfy different traceability methods, including optical density for hardcopy image and luminance for softcopy. For luminance, a generation equipment is designed to build the relationship between luminance and grayscale. In this work, novel equipment is established using digital light processing (DLP) by time-frequency modulation, and the corresponding uncertainty is analyzed. The experiment result shows that this digital equipment builds the relationship between grayscale and luminance in the range of 0.16-4000 cd/m2. It enables traceable measurement of grayscale to luminance on this equipment with high accuracy and can provide a standardized reference for the display of grayscale images in the fields of medicine, remote sensing, non-destructive testing, etc.
Highlights
Grayscale is an important feature which characterizes the lightness and darkness of an image, and grayscale images are widely used in medical, remote sensing, and industrial inspection fields [1,2,3,4].Color images can be converted to grayscale by weighting algorithm as required [5]
The changes in optical density on a plane are achieved by adjusting the spatial frequency in the ways of amplitude modulation (AM) or frequency modulation (FM)
2.3; the generated from the unique light source by digital light processing (DLP)
Summary
Color images can be converted to grayscale by weighting algorithm as required [5]. In recent years, it has been applied in the technology of image segmentation, target recognition, and machine vision based on differences and discontinuous changes in image grayscale [6,7,8]. The standardization of grayscale display is essentially significant for image communication, transmission, and terminal reading. The traditional grayscale standardization method is making or selecting a gray image as the display reference and comparing the obtained gray image with the reference to requantize the fixed value [9,10,11].
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