| Detection Algorithm of Lenslet Array Spot Pattern for Acquisition of Laser Wavefront |
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Jae-Il Lee, Young-Cheol Lee, Joon Huh |
| 레이저 파면 획득용 Lenslet Array 점 패턴 검출 알고리즘 |
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이재일, 이영철, 허준 |
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국방과학연구소 |
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| Abstract |
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In this paper, a new detection algorithm was proposed for finding the position of lenslet array spot pattern used to acquire laser wavefront. Based on the analysis of the required signal processing characteristics, we categorized into and designed four main signal processing functions. The proposed was designed in order to have robust feature against a variation of geometrical form of the spot and also implemented to have semi-automatic thresholding capability based on CCD noise analysis. For performance evaluation, we made qualitative and quantitative comparisons with Carvalho's algorithm which has been published in recent. In the given experimental spot images, the proposed could detect the spots which has 1/3 times lower than the least S/N of which Carvalho's can detect and could reach to a detection precision of 0.1 pixel at the S/N. In functional aspect, the proposed could separate all valid spots locally. From these results, the proposed could have a superior precision of location detection of spot pattern in wider S/N range. |
| Key Words:
Shack-Hartmann Sensor, Lenslet Spot Detection |
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