Input: Data types of the input arguments to this 4gl function; must have one-to-one correspondence from left to right, and must match the count of arguments, as in the function definition.
OUTPUT: Data types of result returned from this 4GL function; must have one-to-one correspondence from left to right, and must match the count of arguments, as in the function definition.
We have studied a new algorithm of feature point correspondence based on artificial landmark, solved the problem of feature point match between images.