AI that de-hazes and adds color to underwater photos

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Ever seen that submerged pictures have a tendency to be blurry and somewhat twisted? That is because phenomena such as light attenuation and back-scattering adversely impact visibility. To cure this, researchers at Harbin Engineering University at China invented a machine learning algorithm that generates realistic water pictures, together with another algorithm that trains on these pictures to restore natural color and reduce haze.

The group notes that many underwater picture enhancement algorithms (like those who correct white balance) are not based on physiological imaging versions, which makes them badly suited to this job. By comparison, this strategy taps a generative adversarial network (GAN) — an AI version composed of a generator which tries to deceive a discriminator into classifying artificial samples as real-life samples — to make a set of pictures of particular survey websites which are fed into another algorithm, known as U-Net.

The group coached the GAN to a corpus of branded scenes comprising 3,733 pictures and corresponding thickness maps, chiefly of scallops, sea cucumbers, sea urchins, and similar organisms residing within indoor sea farms. Additionally, they sourced open data collections such as NY Depth, which includes thousands of underwater photos in total.

Post-training, the investigators compared the outcomes of the twin-model approach to this of baselines. They point out that their approach has benefits as it’s uniform in its own color recovery, and it simplifies green-toned images nicely without ruining the inherent structure of the first input image. Additionally, it generally manages to recoup color while keeping”appropriate” brightness and contrast, a job where rival options are not particularly skillful.

It is worth noting that the researchers’ approach is not the first to rebuild frames from ruined footage. Elsewhere, scientists at Microsoft Research Asia at September comprehensive an end-to-end system for autonomous movie colorization; scientists in Nvidia last year clarified a frame that infers colors from one colorized and annotated video framework; and Google AI at June introduced an algorithm which colorizes grayscale videos with no guide human oversight.

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