Visibility

Naturalness

Color image

Color correction

Image processing

Image restoration

Distortion (music)

Artificial intelligence

Physics

Haze

Channel (broadcasting)

Meteorology

Image (mathematics)

Optics

Color balance

Quantum mechanics

Amplifier

Computer science

Bandwidth (computing)

Computer network

Computer vision

IEEE Transactions on Circuits and Systems for Video Technology

Hazy images suffer from low visibility since the light gets scattered as it passes through various atmospheric particles. Moreover, such images are prone to color distortion, particularly in real weather conditions like sandstorms. In this letter, an effective dehazing technique is proposed using weighted least squares filtering on dark channel prior and color correction that involves automatic detection of color cast images. We show that the spread of the hue in a hazy image can differentiate a color cast image from a non-cast one. We propose a measure using the same for categorizing hazy images as cast and non-cast ones. Our novel color correction is performed by color balancing using a non-linear transformation followed by a cast-adaptive airlight refinement. Subjective and quantitative evaluations show that our method outperforms the state-of-the-art. It removes cast satisfactorily and reduces haze substantially while maintaining the naturalness of the image. Moreover, it produces visually pleasing images without halo artifacts.

Color Cast Dependent Image Dehazing via Adaptive Airlight Refinement and Non-Linear Color Balancing