實時圖像缩放双线性插值verilog代码

实时图像缩放是一种常见的图像处理技术，其中双线性插值是一种常用的插值方法。下面是一个简单的Verilog代码示例，用于实现实时图像缩放的双线性插值：

module Bilinear_Interpolation (
  input wire clk,
  input wire rst,
  input wire [7:0] in_pixel,
  input wire [7:0] scale_factor_x,
  input wire [7:0] scale_factor_y,
  output wire [7:0] out_pixel
);

  reg [7:0] pixel_00, pixel_01, pixel_10, pixel_11;
  reg [7:0] out_pixel_r, out_pixel_g, out_pixel_b;
  reg [7:0] x_frac, y_frac;
  reg [15:0] x_int, y_int;
  reg [15:0] x_frac_inv, y_frac_inv;
  reg [15:0] w1, w2, w3, w4;

  always @(posedge clk or posedge rst) begin
    if (rst) begin
      pixel_00 <= 8'h00;
      pixel_01 <= 8'h00;
      pixel_10 <= 8'h00;
      pixel_11 <= 8'h00;
      out_pixel_r <= 8'h00;
      out_pixel_g <= 8'h00;
      out_pixel_b <= 8'h00;
      x_frac <= 8'h00;
      y_frac <= 8'h00;
      x_int <= 16'h0000;
      y_int <= 16'h0000;
      x_frac_inv <= 16'h0000;
      y_frac_inv <= 16'h0000;
      w1 <= 16'h0000;
      w2 <= 16'h0000;
      w3 <= 16'h0000;
      w4 <= 16'h0000;
    end else begin
      pixel_00 <= in_pixel;
      pixel_01 <= in_pixel;
      pixel_10 <= in_pixel;
      pixel_11 <= in_pixel;
      out_pixel_r <= 8'h00;
      out_pixel_g <= 8'h00;
      out_pixel_b <= 8'h00;
      x_frac <= scale_factor_x[7:0];
      y_frac <= scale_factor_y[7:0];
      x_int <= scale_factor_x[15:8];
      y_int <= scale_factor_y[15:8];
      x_frac_inv <= 16'h0100 - x_frac;
      y_frac_inv <= 16'h0100 - y_frac;

      w1 <= x_frac_inv * y_frac_inv;
      w2 <= x_frac * y_frac_inv;
      w3 <= x_frac_inv * y_frac;
      w4 <= x_frac * y_frac;

      out_pixel_r <= (pixel_00[7:0] * w1[15:8] + pixel_01[7:0] * w2[15:8] + pixel_10[7:0] * w3[15:8] + pixel_11[7:0] * w4[15:8]) >> 8;
      out_pixel_g <= (pixel_00[7:0] * w1[7:0] + pixel_01[7:0] * w2[7:0] + pixel_10[7:0] * w3[7:0] + pixel_11[7:0] * w4[7:0]) >> 8;
      out_pixel_b <= (pixel_00[7:0] * w1[15:8] + pixel_01[7:0] * w2[15:8] + pixel_10[7:0] * w3[15:8] + pixel_11[7:0] * w4[15:8]) >> 8;

      out_pixel <= {out_pixel_r, out_pixel_g, out_pixel_b};
    end
  end

endmodule

这段代码实现了一个名为`Bilinear_Interpolation`的模块，它接收输入像素值`in_pixel`和水平、垂直缩放因子`scale_factor_x`、`scale_factor_y`。输出为经过双线性插值后的像素值`out_pixel`。