| 摘要 |
In methods and apparatus for framing-light projection onto a painting or other target, light from an array (1) of light- emitting diodes (LEDs) is reflected differentially by a micro- mirror array within a projection unit (4) to shape the cross- section of the projected light-beam. The shaping is under the control of an image-processing control unit (3) in accordance with a digitally-defined boundary in the form of a computer graphic of closed two-dimensional outline stored in a data storage unit (7). An image of the target from a digital camera (21) can be analysed in conjunction with a stored library of shapes to derive a digitally-defined framing- boundary for indication or motorised adjustment of the orientation/ setting of the projection unit (4) required for this framing. A light sensor 24 may be used with the projection unit (4) to maintain the lighting level of the target within a predetermined limit. |
