各类图像加速算法汇总

最新推荐文章于 2024-08-17 16:32:43 发布

ZZ2588

最新推荐文章于 2024-08-17 16:32:43 发布

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文章标签：算法 fpga开发

本文链接：https://blog.youkuaiyun.com/ZZ2588/article/details/122220394

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这篇博客介绍了使用Verilog硬件描述语言实现图像处理的几个关键步骤，包括Sobel边缘检测算子、均值滤波以及中值滤波。Sobel算子通过计算像素邻域的梯度来增强图像边缘；均值滤波用于平滑图像，减少噪声；中值滤波则可以有效去除椒盐噪声，保持边缘细节。这些模块展示了在数字图像处理领域的硬件实现思路。

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1.sobel算子（verilog）

`timescale 1ns / 1ps
//
// Company: 
// Engineer: 
// 
// Create Date: 2021/11/20 15:33:31
// Design Name: 
// Module Name: x
// Project Name: 
// Target Devices: 
// Tool Versions: 
// Description: 
// 
// Dependencies: 
// 
// Revision:
// Revision 0.01 - File Created
// Additional Comments:
// 
//


module x(
input   wire    vga_clk,
input   wire    rst_n,
input   wire    [9:0]   pos_x,
input   wire    [9:0]   pos_y,
input   wire    [23:0]  rgb_data,

output  reg    [11:0]  soble_out
    );
reg state;
wire    [7:0]   r;        
wire    [7:0]   g;   
wire    [7:0]   b;
wire    [23:0]  gray;

assign  r=rgb_data[23:16];
assign  g=rgb_data[15:8];  
assign  b=rgb_data[7:0];

assign  gray = r*5/16 +g*9/16 + b*2/4;
//assign  gray_data   ={gray,gray,gray };
reg     line_clk;
reg [7:0]   linebuf0[639:0];
reg [7:0]   linebuf1[639:0];
reg [7:0]   p0;
reg [7:0]   p1;
reg [7:0]   p2;
reg [9:0]   conv_out;            
always@(posedge vga_clk or negedge rst_n)
    if(pos_y >0 && pos_y <480  && pos_x == 0)
        line_clk =1;
     else
        line_clk =0;
//--------------------state-----------------------        
always@(posedge vga_clk or negedge rst_n)        
    if(pos_y == 1'd1)
        state<= 0;

    else
        state <= ~state;
        
always@(posedge vga_clk)
begin
    case(state)
        1'b0:
            begin
                linebuf0[pos_x] <= gray;
                linebuf1[pos_x]<= linebuf1[pos_x];
                p2<=gray;
                p1<=p2;
                p0 <=p1;
                if(pos_x>1 && pos_y >2)
                // 1 2 3        -1 -2 -1
                //4 5 6         0 0 0
                //7 8 9         1 2 1             
                    begin
                        if((p0 +p1*2 +p2) >(linebuf0[pos_x-2]+ linebuf0[pos_x-1]+linebuf0[pos_x]))
                             conv_out <=  ( (p0 +p1*2 +p2)-(linebuf0[pos_x-2]+ linebuf0[pos_x-1]+linebuf0[pos_x]) )/4;
                         else
                            conv_out <= ( (linebuf0[pos_x-2]+ linebuf0[pos_x-1]+linebuf0[pos_x]) -(p0 +p1*2 +p2) )/4; 
                    end
            end
            
        1'b1: begin
                 linebuf1[pos_x] <= gray;
                linebuf0[pos_x]<= linebuf0[pos_x];
                 p2<=gray;
                p1<=p2;
                p0 <=p1;  
                 if(pos_x>1 && pos_y >2)
                   begin
                        if((p0 +p1*2 +p2) >(linebuf1[pos_x-2]+ linebuf1[pos_x-1]+linebuf1[pos_x]))
                             conv_out <=  ( (p0 +p1*2 +p2)-(linebuf1[pos_x-2]+ linebuf1[pos_x-1]+linebuf1[pos_x]) );

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