| 摘要 |
<p>A camera 1 picks up images Gi(x, y) (i = ordinal number of the image) in a certain rhythm of a quasi-stationary object present in a noisy environment. Each of these images is converted by the camera 1 itself into an image signal gi(t). These image signals are processed in a processing device (2, 3, 4) which supplies an output image signal hi(t) as a result of each image signal applied thereto, which output image signal is converted into an image in a monitor 5. …<??>Due to the noisy environment in which the object is present, the images Gi(x, y) consist of an ideal image H(x, y) and a noise image Ni(x, y), which noise image is in principle also present in the image supplied by the monitor 5. In order to eliminate this noise image as much as possible the processing device comprises an image enhancement circuit 3 which is provided with an accumulator circuit 33 and a weighting circuit 35. The weighting circuit 35 receives a difference signal indicating the difference between the actual image signal g/< ANd >i(n) and the output signal hi(n) of the accumulator circuit. In this weighting circuit 35 this difference signal is multiplied by a weighting factor k(i) which is dependent on the ordinal number i of the actual image signal g/< ANd >1(n). For example, k(i) = 1/i.</p> |
