Invariant moments are important measure in the pattern recognition. Invariant moments are independent of position, scale and orientation.

不变矩是模式识别中的一种重要方法，它具有平移不变性、比例不变性和旋转不变性等优点。

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"The scale, position and unique nature of the building lead us to believe it played a key role in shipbuilding activities, " he added.

BBC: Roman shipyard found by British archaeologists

"Unlike south-east England, Wales cannot afford to lose such jobs until we are in a position to develop large scale high-tech companies, " he said.

BBC: Agencies meet over Dewhirst jobs

The good news for Tesco is that its scale and position in the market, along with its strong overseas operations, make it one of the best placed to deal with hefty price cuts this year.

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