| 摘要 |
A photographic exposure control system automatically classifies ambient scene lighting conditions as normal, backlit or forelit and then selects an exposure parameter signal program that is appropriate for the indicated conditions. The system monitors a plurality of different portions of the scene area with a multi-sensor array that detects both subject range and ambient light intensity. A comparison of range measurements identifies that scene area portion having the nearest subject therein as the subject area. Ambient light intensity measurements of subject and non-subject areas are compared to classify lighting conditions and select a corresponding one of normal, backlit and forelit signal programs which control operation of system components to vary the ratio of ambient to artificial light contribution to exposure for the indicated lighting conditions. |
