图像处理：生成3×3的窗口

生成3×3的窗口

module Shift_RAM_3X3(
	//global signals
	input 					clk,						
	input 					rst_n,							
	//Image data prepred to be processd
	input					per_frame_vsync,	//Prepared Image data vsync valid signal
	input					per_frame_href,		//Prepared Image data href vaild signal
	input					per_frame_clken,	//Prepared Image data output/capture enable clock
	input			[7:0]	per_img_Y,			//Prepared Image brightness input
	
	//Image data has been processd
	output					matrix_frame_vsync,	//Prepared Image data vsync valid signal
	output					matrix_frame_href,	//Prepared Image data href vaild signal
	output					matrix_frame_clken,	//Prepared Image data output/capture enable clock 
		
	output 	reg 	[7:0]	matrix_p11,						
	output 	reg		[7:0]	matrix_p12,						
	output 	reg		[7:0]	matrix_p13,			//3X3 Matrix output
	output 	reg		[7:0]	matrix_p21,						
	output 	reg		[7:0]	matrix_p22,						
	output 	reg		[7:0]	matrix_p23,						
	output 	reg		[7:0]	matrix_p31,						
	output 	reg		[7:0]	matrix_p32,						
	output 	reg		[7:0]	matrix_p33					
    );
	
	//----------------------------------------------
	//consume 1clk
	wire 	[7:0] 	row1_data;//frame data of the 1th row
	wire 	[7:0]	row2_data;//frame data of the 2th row
	reg 	[7:0] 	row3_data;//frame data of the 3th row

// ==================================================================================================== 
// 得到一个3×n的矩阵
// ====================================================================================================
	
// 将正在输入的Y值给data_3，data_3一直在最上面那一行
	always @(posedge clk or negedge rst_n)begin
		if(!rst_n)
			row3_data <= 8'b0;
		else begin
			if(per_frame_clken)
				row3_data <= per_img_Y;
			else
				row3_data <= row3_data;
			end
	end

	
	//Shift_RAM_3X3_8bit1
	//在这个IP和内部会先将输入的data_3存到RAM中，等存满一行后，就将data_3给data_2进行输出
	Shift_RAM_3X3_8bit u1_Shift_RAM_3X3_8bit (
		.D		(row3_data),					// 输入的灰度Y，即当前正在输入的那一行
		.CLK	(per_frame_clken & clk),		// input wire CLK
		.Q		(row2_data)						// output wire [7 : 0] Q
);

	//Shift_RAM_3X3_8bit2
	Shift_RAM_3X3_8bit u2_Shift_RAM_3X3_8bit (
		.D		(row2_data),					// input wire [7 : 0] D
		.CLK	(per_frame_clken & clk),		// input wire CLK
		.Q		(row1_data)						// output wire [7 : 0] Q
);
// ====================================================================================================、、
	

	//per_clken delay 3clk
	reg [4:0]per_frame_clken_r;
	reg [4:0]per_frame_vsync_r;
	reg [4:0]per_frame_href_r;

	
	always @(posedge clk or negedge rst_n)begin
		if(!rst_n)begin
			per_frame_clken_r <= 5'b0;
			per_frame_vsync_r <= 5'b0;
			per_frame_href_r  <= 5'b0;
		end
		else begin
			per_frame_clken_r <= {
    per_frame_clken_r[3:0], per_frame_clken};
			per_frame_vsync_r <= {
    per_frame_vsync_r[3:0], per_frame_vsync};
			per_frame_href_r  <= {
    per_frame_href_r [3:0], per_frame_href};
		end
	end
	
	
	assign 	matrix_frame_clken = per_frame_clken_r[4];
	assign 	matrix_frame_href  = per_frame_href_r [4];
	assign 	matrix_frame_vsync = per_frame_vsync_r[4];
	
	/**************************************** (1)read data from shift_RAM (2)caulate the sobel (3)steady data after sobel generate ******************************************/
	
	// 将那3行数据进行打拍 
	always @(posedge clk or negedge rst_n)begin
		if(!rst_n)begin
			{
    matrix_p11, matrix_p12, matrix_p13} <= 24'h0;
			{
    matrix_p21, matrix_p22, matrix_p23} <= 24'h0;
			{
    matrix_p31, matrix_p32, matrix_p33} <= 24'h0;
		end
		else if(per_frame_clken_r[3])begin												//shift_RAM data read clock enbale 
			{
    matrix_p11, matrix_p12, matrix_p13} <= {
    matrix_p12, matrix_p13, row1_data};//1th shift input
			{
    matrix_p21, matrix_p22, matrix_p23} <= {
    matrix_p22, matrix_p23, row2_data};//2th shift input 
			{
    matrix_p31, matrix_p32, matrix_p33} <= {
    matrix_p32, matrix_p33, row3_data};//3th shift input 
		end
		else begin
			{
    matrix_p11, matrix_p12, matrix_p13} <= {
    matrix_p11, matrix_p12, matrix_p13};
			{
    matrix_p21, matrix_p22, matrix_p23} <= {
    matrix_p21, matrix_p22, matrix_p23};
			{
    matrix_p31, matrix_p32, matrix_p33} <= {
    matrix_p31, matrix_p32, matrix_p33};
		end
	end
	
	
endmodule