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Telescope Automatic Alignment and Pointing using Pattern Matching(Vision and Recognition 1,Session: MA1-D)

We present a new method to align and point small telescope systems. The method is based on synthesizing of the image of the batch of sky to which the telescope is pointing using a database star catalogue. An image of the sky is acquired which is processed and matched with the synthesized image. Point pattern matching is used first to identify some stars in both images, then normalized correlation matching is used to ensure and precisely match both of the acquired and synthesized images. An image processing and frame grabber board is used to draw stars of the synthesized image and to extract star centers as well as their areas. This process solved the main problem of polar alignment of small and movable telescopes, which was tedious and very time consuming. In addition, it is used in precise pointing. The system is composed of a small inexpensive CCD camera coupled to a wide field lens and a frame grabber and image processing board. As the images of the stars are used to control the telescope, neither precise timing nor precise encoders are required.