lpm_abs1.v

图像处理中边缘检测的VHDL源代码,所用的算法是garbor变换

module lpm_abs1 ( result, overflow, data ) ;

	parameter lpm_type = "lpm_abs" ;
	parameter lpm_width = 1 ;
	parameter lpm_hint = "UNUSED" ;

	input  [lpm_width-1:0] data ;
	output [lpm_width-1:0] result ;
	output overflow ;

	reg    [lpm_width-1:0] a_int ;
	reg    [lpm_width-1:0] result ;
	reg    overflow;
	integer i;

	always @(data)
		begin

			overflow = 0;
			if (data[lpm_width-1] == 1)
				begin
					a_int = 0;
					for(i = 0; i < lpm_width - 1; i = i + 1)
						a_int[i] = data[i] ^ 1;
					result = (a_int + 1);
					overflow = (result == ( 1<<(lpm_width -1)));
				end
			else
				result = data;
		end

endmodule // lpm_abs