Subversion Repositories fully-pipelined-edge-detection-algorithms

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-- Company: 

-- Engineer: 

-- 

-- Create Date: 01/13/2022 10:56:24 PM

-- Design Name: 

-- Module Name: EdgeDetection - Behavioral

-- Project Name: 

-- Target Devices: 

-- Tool Versions: 

-- Description: 

-- 

-- Dependencies: 

-- 

-- Revision:

-- Revision 0.01 - File Created

-- Additional Comments:

-- 

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LIBRARY IEEE;

USE IEEE.STD_LOGIC_1164.ALL;

USE work.OperatorOverloading_pkg.ALL;

USE work.EdgeDetection_pkg.ALL;

-- Uncomment the following library declaration if using

-- arithmetic functions with Signed or Unsigned values

use IEEE.NUMERIC_STD.ALL;

-- Uncomment the following library declaration if instantiating

-- any Xilinx leaf cells in this code.

--library UNISIM;

--use UNISIM.VComponents.all;

ENTITY PrewittFilter IS

    PORT (

        CLK                     : IN STD_LOGIC;

        EdgeDetection_Enable    : IN STD_LOGIC;

        EdgeDetection_Disable   : IN STD_LOGIC;

        EdgeDetection_Din       : IN array2D(0 TO 2)(7 DOWNTO 0);

        EdgeDetection_Dout      : OUT STD_LOGIC_VECTOR(31 DOWNTO 0);

        EdgeDetection_Ready     : OUT STD_LOGIC

    );

END PrewittFilter;

ARCHITECTURE Behavioral OF PrewittFilter IS

    signal Din_Buffer               : array3D(0 to 2)(0 to 2)(7 downto 0)   := (others => (others => (others => '0')));

    signal MultArray_Reg_x          : array3D(0 to 2)(0 to 2)(16 downto 0)  := (others => (others => (others => '0')));

    signal AddArray_Layer1_x        : array2D(0 to 2)(16 downto 0)          := (others => (others => '0'));

    signal AddArray_Layer2_x        : std_logic_vector(16 downto 0)         := (others => '0');

    signal Convolution_Res_x        : std_logic_vector(33 downto 0)         := (others => '0');

    signal MultArray_Reg_y          : array3D(0 to 2)(0 to 2)(16 downto 0)  := (others => (others => (others => '0')));

    signal AddArray_Layer1_y        : array2D(0 to 2)(16 downto 0)          := (others => (others => '0'));

    signal AddArray_Layer2_y        : std_logic_vector(16 downto 0)         := (others => '0');

    signal Convolution_Res_y        : std_logic_vector(33 downto 0)         := (others => '0');

    signal EdgeDetection_Dout_Reg   : STD_LOGIC_VECTOR(33 DOWNTO 0)         := (others => '0');

    TYPE states IS (

        S_IDLE,

        S_CONVOLVE

    );

    SIGNAL state : states := S_IDLE;

    constant Coeff_x : array3D(0 to 2)(0 to 2)(7 downto 0) := (

        (x"01", x"00", x"ff"),

        (x"01", x"00", x"ff"),

        (x"01", x"00", x"ff")

    );

    constant Coeff_y : array3D(0 to 2)(0 to 2)(7 downto 0) := (

        (x"01", x"01", x"01"),

        (x"00", x"00", x"00"),

        (x"ff", x"ff", x"ff")

    );

    signal cntr         : integer range 0 to 7 := 0;

    signal cntrDisable  : integer range 0 to 7 := 0;

BEGIN

    P_MAIN : PROCESS (CLK)

    BEGIN

        IF rising_edge(CLK) THEN

            CASE state IS

                WHEN S_IDLE =>

                    EdgeDetection_Ready <= '0';

                    IF EdgeDetection_Enable THEN

                        state <= S_CONVOLVE;

                        Din_Buffer(0)           <=  EdgeDetection_Din;

                        Din_Buffer(1 to 2)      <= Din_Buffer(0 to 1);

                        cntr                    <= 0;

                    END IF;

                WHEN S_CONVOLVE =>

                    Din_Buffer(0)               <=  EdgeDetection_Din;

                    Din_Buffer(1 to 2)          <= Din_Buffer(0 to 1);

                    MultArray_Reg_x             <= Coeff_x * ("0" & Din_Buffer);

                    AddArray_Layer1_x(0)        <= std_logic_vector(signed(MultArray_Reg_x(0)(0)) + signed(MultArray_Reg_x(0)(1))  + signed(MultArray_Reg_x(0)(2)));

                    AddArray_Layer1_x(1)        <= std_logic_vector(signed(MultArray_Reg_x(1)(0)) + signed(MultArray_Reg_x(1)(1))  + signed(MultArray_Reg_x(1)(2)));

                    AddArray_Layer1_x(2)        <= std_logic_vector(signed(MultArray_Reg_x(2)(0)) + signed(MultArray_Reg_x(2)(1))  + signed(MultArray_Reg_x(2)(2)));

                    AddArray_Layer2_x           <= std_logic_vector(signed(AddArray_Layer1_x(0)) + signed(AddArray_Layer1_x(1)) + signed(AddArray_Layer1_x(2)));

                    Convolution_Res_x           <= std_logic_vector(signed(AddArray_Layer2_x) * signed(AddArray_Layer2_x));

                    MultArray_Reg_y             <= Coeff_y * ("0" & Din_Buffer);

                    AddArray_Layer1_y(0)        <= std_logic_vector(signed(MultArray_Reg_y(0)(0)) + signed(MultArray_Reg_y(0)(1))  + signed(MultArray_Reg_y(0)(2)));

                    AddArray_Layer1_y(1)        <= std_logic_vector(signed(MultArray_Reg_y(1)(0)) + signed(MultArray_Reg_y(1)(1))  + signed(MultArray_Reg_y(1)(2)));

                    AddArray_Layer1_y(2)        <= std_logic_vector(signed(MultArray_Reg_y(2)(0)) + signed(MultArray_Reg_y(2)(1))  + signed(MultArray_Reg_y(2)(2)));

                    AddArray_Layer2_y           <= std_logic_vector(signed(AddArray_Layer1_y(0)) + signed(AddArray_Layer1_y(1)) + signed(AddArray_Layer1_y(2)));

                    Convolution_Res_y           <= std_logic_vector(signed(AddArray_Layer2_y) * signed(AddArray_Layer2_y));

                    EdgeDetection_Dout_Reg  <= std_logic_vector(unsigned(Convolution_Res_x) + unsigned(Convolution_Res_y));

                    if cntr = 5 then

                        cntr    <= 0;

                        EdgeDetection_Ready <= '1';

                    else

                        cntr    <= cntr + 1;

                    end if;

                    if EdgeDetection_Disable = '1' then

                        cntrDisable <= cntrDisable + 1;

                    end if;

                    if cntrDisable = 6 then

                        state   <= S_IDLE;

                        EdgeDetection_Ready <= '0';

                        cntr    <= 0;

                        cntrDisable <= 0;

                    end if;

            END CASE;

        END IF;

    END PROCESS;

    EdgeDetection_Dout  <= EdgeDetection_Dout_Reg(31 downto 0);

END Behavioral;