![]() We show the developed system and describe all its components, calibration processes, and the algorithm implemented to obtain the high dynamic range spectral reflectance measurement. To overcome this problem, this article presents a system for capturing hyperspectral images consisting of a matrix of twelve spectral filters placed in twelve cameras, which, after processing these images, makes it possible to obtain the high dynamic range image to measure the spectral reflectance of the work of art being evaluated. This means that when evaluating an artwork under uncontrolled lighting conditions and with light and dark areas in the same scene, hyperspectral images with underexposed or saturated areas would be obtained at low or high exposure times, respectively. These types of sensors have a limited dynamic range and non-linear response. The proposed method can be the foundation of a damage appearance model (DAM).Ĭommercial hyperspectral imaging systems typically use CCD or CMOS sensors. The proposed representation model can be used for individual pigments or paintings with numerous pigments. It is possible to quantify the volume of the graph by summing unique voxels, which enables comparison of the performance of different light sources. Resulting discretized 3-D volumes display the trade-offs between selected measures. The continuous data in each dimension of the 3-D volume are converted to discrete data by identifying a significant minimum value (unit voxel). Here, various metrics related to museum lighting (damage, the color quality of paintings, illuminance, luminous efficacy of radiation) are analyzed using a voxelated 3-D volume. However, there are no established metrics that quantify the output variability or highlight the trade-offs between different metrics. Multi-primary LEDs can provide great flexibility in terms of color quality, damage reduction, and energy efficiency for artwork illumination. The dilemma between visibility and damage, coupled with the inverse relationship between color quality and energy efficiency, poses a challenge for curators, conservators, and lighting designers in identifying optimal light sources. However, light is needed to initiate vision and display artwork. Light causes damage when it is absorbed by sensitive artwork, such as oil paintings. However, by means of the projection mapping technique, a restored vision of the artwork can be obtained by projecting an image on it, called in many studies the compensation image. A restoration by a classical method can then be complicated. Some artworks have had their appearance affected due to the action of external agents, such as non-optimal humidity/temperature conditions or the incidence of electromagnetic radiation from the sun or different sources of artificial light over their years of exposure. Among the applications mentioned above, the application related to the conservation and exhibition of cultural heritage objects will be described in more depth. used the mapping projection technique to alter the perception of bending stiffness of a fabric. ![]() developed a technique called Deformation Lamps to achieve the perception of the movement of objects while maintaining their original colour and texture. used the projection mapping technique in combination with psychophysical studies to alter the perception of movement through lighting. where the result is shown after illuminating a cultural artifact with the Revealing Flashlight technique. In addition, since the described technique consists of projecting light, and one of the applications is related to cultural heritage, those studies that carry out the design and optimization of lighting systems will be described for a correct appreciation of the works of art, without altering its state of conservation. ![]() This review has treated the main studies of light projection as a technique to alter the appearance of objects, emphasizing the calibration methods used in each study, taking into account the importance of a correct calibration between devices to carry out this technology. Furthermore, the technique of altering the appearance of objects through the projection of light has been used in projects with artistic or even educational purposes. Considering the limitation of non-contact when analysing a work of art, these optical techniques have been used in fields of restoration of cultural heritage, allowing us to visualize the work as it was conceived by its author, after a process of acquisition and treatment of the image. The virtual modification of the appearance of an object using lighting technologies has become very important in recent years, since the projection of light on an object allows us to alter its appearance in a virtual and reversible way. ![]()
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