Based on past cases solved by TOYOTEC, we will explain the key points in camera lenses for human recognition and human monitoring systems.
Issues in human recognition / monitoring systems
■Environment changes drastically based on time, location, etc.
■The objectives are “humans” who continuously move
■Market LED lighting have inconsistent illuminance distribution
For human recognition / monitoring systems, the ability to operate stably without being affected by changes in the surroundings is a must . The acquired information must be free of noise and have all required information. The information needed will decide the lens specification. When designing these devices, optical design and lens design knowledge are required.
A lens with a focal length close to the human viewing angle is called a “standard lens,” while a lens with a focal length closer than that of a standard lens is called a “wide-angle lens”. Wide-angle lenses are used in all kinds of optical systems, including cameras, because they can capture a wider range of images than standard lenses.
On the other hand, one of the requirements for wide-angle lenses is “low distortion”. Distortion and volume deformation are typical distortions in wide-angle lenses. This is a result of wide-angle lenses being convex lenses. When you use a wide-angle lens to obtain information over a wide area, distortion is an issue that is bound to occur, no matter how small or large the level.
Here are some tips on how to eliminate this distortion.