Abstract
Optical systems in digital cameras present a limit during the acquisition of standard and High Dynamic Range Images (HDRI) due to the presence of veiling glare, an artifact caused by an unwanted spread of the source of light. In this paper, we analyze the state-of-the-art of veiling glare removal in HDRI, giving attention to the paper presented by Talvala. Then we describe an algorithm for veiling glare removal based on the same occlusion mask, to study the benefits provided by it in HDRI acquisition process. Finally, we demonstrate the efficiency of the occlusion mask method in veiling glare removal without any post production estimation and subtraction.
Highlights
An High Dynamic Range Images (HDRI) (High Dynamic Range Image) is a digital image that represents a greater range of luminance levels than those obtained using a traditional sensor with a single exposure
Acquisition techniques are based on a combination of several pictures of the same scene shot with different exposition parameters: doing that it’s possible to include in a single image a larger amount of luminance values that in a Low Dynamic Range Image (LDRI) would be lost due to the quantization limit
Veiling glare is different from the lens flare phenomenal: the second one appears when a punctiform and intense light source introduces in the image geometrical artifacts well defined; the veiling glare is instead related to extended sources of light and is similar to a blurred lens flare: it can be caused by light sources out of the field of view but in this case it can be avoided using a lens hood
Summary
An HDRI (High Dynamic Range Image) is a digital image that represents a greater range of luminance levels than those obtained using a traditional sensor with a single exposure. HDRI acquisition techniques are based on a combination of several pictures of the same scene shot with different exposition parameters: doing that it’s possible to include in a single image a larger amount of luminance values that in a Low Dynamic Range Image (LDRI) would be lost due to the quantization limit. This imaging technique is used in science, photography [1] and medicine. Veiling glare is a global illumination effect caused by multiple light dispersions inside the camera’s optical system. Veiling glare is different from the lens flare phenomenal: the second one appears when a punctiform and intense light source introduces in the image geometrical artifacts well defined; the veiling glare is instead related to extended sources of light and is similar to a blurred lens flare: it can be caused by light sources out of the field of view but in this case it can be avoided using a lens hood
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