Number segmentation techniques Assume that the speed limit at a place is captured and is provided as an input to a system which checks if the speed of vehicle is above the accepted level or not. For checking, the number in the speed limit image has to be extracted.

Can anyone suggest a simple method to perform number segmentation and identification in the above case?
Also if K-means algorithm can be used?
As with all ocr, you need to segment each individual character. Assuming this step is already done (and maybe some post processing to One easy way is to take the number and reduce the resolution. Similar to a lcd character display. 

You can then do a simple correlation between the reduced resolution number from the image, and a template. Since the numbers on street signs are printed and very consistent a simple template match could work well.

your template should contain the numbers 0-9 in a font that closely matches those used on your road signs.