图像处理3：Sobel边缘检测

前言

软件版本 vivado ：2020.1 Quartus ：17.1

正文

边缘检测需要用到的IP核在两款软件中是不一样的

因此，下面分别在两款软件中进行实现

一、在vivado中实现

1.算法流程： 1）、将3×3的窗口和Gx、Gy分别相乘，Gx、Gy均已知 2）、将相乘得到的2个结果各自平方 3）、将平方得到的2个数相加 4）、将相加的结果放入求根的IP核猴子那个开根号 5）、开完根号后和阈值比较，大于阈值的部分置1

2.sobel算子

  Gx：x方向的边缘    Gy：y方向的边缘		     Pixel
 [  -1  0   +1  ]   [  +1  +2   +1 ]     [  P11  P12   P13 ]
 [  -2  0   +2  ]   [   0   0    0 ]     [  P21  P22   P23 ]
 [  -1  0   +1  ]   [  -1  -2   -1 ]     [  P31  P32   P33 ]

`timescale 1ns / 1ps
//
// 1.算法流程：
// 			1）、将3×3的窗口和Gx、Gy分别相乘，Gx、Gy均已知
// 			2）、将相乘得到的2个结果各自平方
// 			3）、将平方得到的2个数相加
// 			4）、将相加的结果放入求根的IP核猴子那个开根号
// 			5）、开完根号后和阈值比较，大于阈值的部分置1
// 
// 
//

`timescale 1ns/1ns

module Sobel_Edge_Detector
(
	//global clock
	input					clk,  				//cmos video pixel clock
	input					rst_n,				//global reset
	
	//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					post_frame_vsync,	//Processed Image data vsync valid signal
	output					post_frame_href,	//Processed Image data href vaild  signal
	output					post_frame_clken,	//Processed Image data output/capture enable clock
	output					post_img_Bit,		//Processed Image Bit flag outout(1: Value, 0:inValid)
	
	//user interface
	input		[7:0]		Sobel_Threshold		//Sobel Threshold for image edge detect
);


	//----------------------------------------------------
	//Generate 8Bit 3X3 Matrix for Video Image Processor.
	//Image data has been processd
	wire				matrix_frame_vsync;						//Prepared Image data vsync valid signal
	wire				matrix_frame_href;						//Prepared Image data href vaild  signal
	wire				matrix_frame_clken;						//Prepared Image data output/capture enable clock	
	wire		[7:0]	matrix_p11, matrix_p12, matrix_p13;		//3X3 Matrix output
	wire		[7:0]	matrix_p21, matrix_p22, matrix_p23;
	wire		[7:0]	matrix_p31, matrix_p32, matrix_p33;
	
	Shift_RAM_3X3 Shift_RAM_3X3_inst
	(
		//global clock
		.clk							(clk),  				//cmos video pixel clock
		.rst_n							(rst_n),				//global reset
		.per_frame_vsync				(per_frame_vsync),		//Prepared Image data vsync valid signal
		.per_frame_href					(per_frame_href),		//Prepared Image data href vaild  signal
		.per_frame_clken				(per_frame_clken),		//Prepared Image data output/capture enable clock
		.per_img_Y						(per_img_Y),			//Prepared Image brightness input
	
		//Image data has been processd
		.matrix_frame_vsync				(matrix_frame_vsync),	//Prepared Image data vsync valid signal
		.matrix_frame_href				(matrix_frame_href),	//Prepared Image data href vaild  signal
		.matrix_frame_clken				(matrix_frame_clken),	//Prepared Image data output/capture enable clock	
		
		.matrix_p11(matrix_p11),	.matrix_p12(matrix_p12), 	.matrix_p13(matrix_p13),	//3X3 Matrix output
		.matrix_p21(matrix_p21), 	.matrix_p22(matrix_p22), 	.matrix_p23(matrix_p23),
		.matrix_p31(matrix_p31), 	.matrix_p32(matrix_p32), 	.matrix_p33(matrix_p33)
);
	//Sobel Parameter
	//  Gx：x方向的边缘   Gy：y方向的边缘		     Pixel
	// [  -1  0   +1  ]   [  +1  +2   +1 ]     [  P11  P12   P13 ]
	// [  -2  0   +2  ]   [   0   0    0 ]     [  P21  P22   P23 ]
	// [  -1  0   +1  ]   [  -1  -2   -1 ]     [  P31  P32   P33 ]
	
	// localparam	P11 = 8'd15,	P12 = 8'd94,	P13 = 8'd136;
	// localparam	P21 = 8'd31,	P22 = 8'd127,	P23 = 8'd231;
	// localparam	P31 = 8'd44,	P32 = 8'd181,	P33 = 8'd249;
	//Caculate horizontal Grade with |abs|
	//Step 1-2
	reg	[9:0]	Gx_temp1;	//postive result
	reg	[9:0]	Gx_temp2;	//negetive result
	reg	[9:0]	Gx_data;	//Horizontal grade data
	//========================================================================
	//矩阵相乘
	//========================================================================
	always@(posedge clk or negedge rst_n)begin
		if(!rst_n)
			begin
				Gx_temp1