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According to the present invention there is provided a method of sensing comprising the steps of, (a) acquiring plurality of measurement values using a distributed optical fibre sensor; (b) arranging the plurality of measurement values in a matrix having at least two dimensions; (c) transforming each measurement value in the matrix to a corresponding pixel value on a predefined scale of pixel values;(d) forming an image with pixels having said corresponding pixel values, wherein each pixel in the image is positioned at a position in the image corresponding to the position of said measurement value in the matrix; (d) processing the image using an image processing algorithm so as to reduce noise in the image to provide processed image; (e) transforming each pixel value of pixels in the processed image to values to provide a plurality of measurement values with reduced noise.