Vision Basics - Camera Calibration and Lighting era calibration created before the lens was refocused are not valid. The camera must be recalibrated. Lighting Types of Lighting Diffuse Light is reflected from a shiny surface at the opposite angle from which it strikes the surface. If most of the light that is reflected from a surface comes from the same angle, the surface has sharp shadows and a great deal of surface glare. Diffuse lighting illuminates a surface with light that strikes the surface from as many different angles as possible, thus minimizing shadows, reflections, and the need for critically placed light sources.
Fluorescent lighting is the most diffuse of the lighting types listed in Types of Lighting . Diffuser plates and reflecting panels produce a more diffuse light. True diffuse lighting requires a parabolic shaped reflector. Applications with high-contrast, complicated objects, spherical objects, shiny objects, or objects that require multiple inspections of interior features are candidates for diffuse light- ing. Back In backlighting, the light source (usually a diffuse source) is placed behind the object to be inspected. Backlighting effectively lights objects whose silhouettes are the critical feature. This is particularly effective if the objects are shiny or have highly variable surfaces.
ACEUser's Guide, 3.6.x, 18316-000 Rev A Page 312 Type Advantages Disadvantages Incandescent Inexpensive, can be cycled Short life (for AC lamps), heat Fluorescent Efficient, cool Cannot be cycled, flickers Tungsten-Halo- gen High output Heat, can’t be cycled Gas Strobes High power, freezes motion Expensive, poor CCD sensitivity IR Laser Good CCD sensitivity Highly divergent, federally reg- ulated He-Ne Laser Highly collimated, infinite depth of field Fragile, expensive, bulky IR & Laser Diodes Not regulated Low power, highly divergent