A method of identifying objects on a touch-sensitive device comprises scanning a plurality of “m” traces of the touch-sensitive device, m being a positive integer, obtaining a count value of each of the “m” traces, wherein an x-th trace has a count value ax, x being an index number from 1 to m, comparing a count value ai with a count value ai+1 in an increasing order of index number in a first comparison process until a count value aj not smaller than aj+1 is identified, and based on the count value aj, comparing the count value aj with one of count values following aj in an increasing order of index number in a second comparison process until a count value ak is identified, wherein a difference between the count values aj and ak satisfies a first threshold.