Abstract
A duststorm image has a reddish or yellowish color cast. Though a duststorm image and a hazy image are obtained using the same process, a hazy image has no color distortion as it has not been disturbed by particles, but a duststorm image has color distortion owing to an imbalance in the color channel, which is disturbed by sand particles. As a result, a duststorm image has a degraded color channel, which is rare in certain channels. Therefore, a color balance step is needed to enhance a duststorm image naturally. This study goes through two steps to improve a duststorm image. The first is a color balance step using singular value decomposition (SVD). The singular value shows the image’s diversity features such as contrast. A duststorm image has a distorted color channel and it has a different singular value on each color channel. In a low-contrast image, the singular value is low and vice versa. Therefore, if using the channel’s singular value, the color channels can be balanced. Because the color balanced image has a similar feature to the haze image, a dehazing step is needed to improve the balanced image. In general, the dark channel prior (DCP) is frequently applied in the dehazing step. However, the existing DCP method has a halo effect similar to an over-enhanced image due to a dark channel and a patch image. According to this point, this study proposes to adjustable DCP (ADCP). In the experiment results, the proposed method was superior to state-of-the-art methods both subjectively and objectively.
Highlights
A duststorm image is obtained through the atmosphere as with a hazy image
A duststorm image is obtained by a similar process as the hazy image, as both images are obtained in the same medium
In case of the white sand particles, a duststorm image seems to be a hazy image with color balance
Summary
A duststorm image is obtained through the atmosphere as with a hazy image. Many studies on enhancing a hazy image use the following mathematical Equation [16,17,18,19]: Ic (x) = Jc (x)· tc ( x ) + Ac ·(1 − tc ( x )) (1)where Jc (x) is the scene radiance; tc ( x ) is the transmission map, which expresses the propagation path of the light; and Ac is the back scatter light of the image; c ∈ {r, g, b}.As shown in Equation (1), a hazy image comprises the transmission map and back scatter light. A duststorm image is obtained through the atmosphere as with a hazy image. Where Jc (x) is the scene radiance; tc ( x ) is the transmission map, which expresses the propagation path of the light; and Ac is the back scatter light of the image; c ∈ {r, g, b}. A hazy image comprises the transmission map and back scatter light. The equation of a duststorm image is shown in Equation (1). The difference between a duststorm image and a hazy image is the presence of a color cast or not and attenuation. A duststorm image has a reddish, yellowish color cast due to the sand particles with mineral. The duststorm image is attenuated by the dust particle, which has various sizes. The size of the dust is generally
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