Visual inspection of industrial environments is a common requirement across heavy industries, such as transportation, construction, and shipbuilding, and typically requires qualified experts to perform the inspection. Inspection locations can often be remote or in adverse environments that put humans at risk, such as bridges, skyscrapers, and offshore oil rigs.
Many of these industries deal with huge metal surfaces and harsh environments. A common problem across these industries is metal corrosion and rust. Although corrosion and rust are used interchangeably across different industries (we also use the terms interchangeably in this post), these two phenomena are different. For more details about the differences between corrosion and rust as well as different degrees of such damages, see Difference Between Rust and Corrosion and Stages of Rust.
Different levels and grades of rust can also result in different colors for the damaged areas. If you have enough images of different classes of

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