eliminate noise data

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Win co 2012-4-18

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/35839-eliminate-noise-data

Hi, In my red curve (see the link below), I circled the points not desired. I would like to know if there is a code to eliminate these points. In fact, I want to keep the trend of my curve to interpolate or fit it with a fit function but first of all I have to eliminate the points that change its trend.

http://img189.imageshack.us/img189/1876/graphw.jpg

Thanks for all your answers. Regards, Winn