用verilog写sobel算法

Sure, here is an example of implementing the Sobel algorithm in Verilog:

module sobel_filter (
  input wire clk,
  input wire rst,
  input wire [7:0] in_data,
  output reg [7:0] out_data
);

  reg [7:0] buffer [2:0][2:0];
  reg [15:0] gx, gy;
  reg [7:0] magnitude;
  
  always @(posedge clk or posedge rst) begin
    if (rst) begin
      gx <= 0;
      gy <= 0;
      magnitude <= 0;
    end else begin
      buffer[0][1] <= buffer[0][0];
      buffer[1][1] <= buffer[1][0];
      buffer[2][1] <= buffer[2][0];
      
      buffer[0][0] <= buffer[0][2];
      buffer[1][0] <= buffer[1][2];
      buffer[2][0] <= in_data;
      
      gx <= (buffer[2][2] + 2 * buffer[2][1] + buffer[2][0]) - (buffer[0][2] + 2 * buffer[0][1] + buffer[0][0]);
      gy <= (buffer[0][2] + 2 * buffer[1][2] + buffer[2][2]) - (buffer[0][0] + 2 * buffer[1][0] + buffer[2][0]);
      
      magnitude <= sqrt(gx**2 + gy**2);
      
      out_data <= magnitude;
    end
  end
  
endmodule

This code defines a module `sobel_filter` that takes an 8-bit input `in_data` and produces an 8-bit output `out_data`. The module uses a 3x3 buffer to store the input data and performs the Sobel operation to calculate the gradient magnitude.

Note that this is a simplified example and may require additional adjustments based on your specific implementation requirements.