The first aspect of this invention relates to a peak data extracting device used in picture processing devices. The peak data extracting device comprises a DDA (data differential analysis) computing unit, an peak filter and a sorting unit. The computing unit gives Hough curves (sine curves) based on...http://www.google.com/patents/US5247587?utm_source=gb-gplus-sharePatent US5247587 - Peak data extracting device and a rotary motion recurrence formula computing device
