Illumination of light formula

With this type of illumination, the light is reflected back directly into the camera via the object. This can be used for uniform illumination of an object space.

Part of the light passes the camera lens and is only reflected back to the camera when the surface of the object changes it. At the same time, however, the special characteristics achieved by the strict application of bright or dark field are weakened.

Types of illumination in slit lamp

spotlight, device used to produce intense illumination in a well-defined area in stage, film, television, ballet, and opera production. It resembles a small searchlight but usually has shutters, an iris diaphragm, and adjustable lenses to shape the projected light. Coloured light is produced by a mechanism for sliding or rotating coloured gelatin filters, called gels even though later made of acetate, into the beam. The first theatrical spotlight was the limelight (q.v.), which gave way to such light sources as the arc, electric discharge, and incandescent lamp. The practical lensed spotlight was developed in 1879 by Louis Hartmann of the United States.

General illumination

By changing the angle to a range between bright and dark field illumination, the light, via the object, is only partially reflected directly back to the camera.

Thus, the object and the background appear dark in the image. Only areas of the object that are at a certain angle to the camera reflect light back to the camera. They are displayed brightly and highlighted, e.g. raised edges, surface scratches.

For this setup, the light from a light source is positioned in a way that the light is not reflected back from the object into the camera's lens.

Different illumination angles create varying images of the object in the camera and thus highlight different object properties. In this way, different inspection tasks can be covered with a variation in angles.

Types of illumination PDF

Follow spotlights project spots that can readily be changed to cover a large area or one as small as a human face. They turn easily on mounts to follow performers.

What is illumination in the Bible

If the object changes the light, e.g. by surfaces inclined away from the light, not all the light from these surfaces is reflected back into the camera. This is used to visualize changes caused by flaws in the object.

Partial illumination at a wide variety of angles can be achieved very well with beams. In this case, four beam illuminators are usually mounted around the object.

Illumination lighting meaning

We speak of toplighting when the illumination is above the object plane, in front of the object. We speak of backlighting when the illumination is below the object plane, behind or below the object.

With this type of illumination, the camera looks directly at the illuminating surface of the light, hence the image background is bright. The object, between the illumination and the camera, creates a partial or even a complete shadowing of the light in the camera. It appears very dark in the image.