FPGA图像缩放代码

这里是一个简单的FPGA图像缩放代码，使用双线性插值算法实现：

module image_scaling (
  input clk,
  input rst,
  input [7:0] in_width,
  input [7:0] in_height,
  input [7:0] out_width,
  input [7:0] out_height,
  input [7:0] in_data [0:in_height-1][0:in_width-1],
  output reg [7:0] out_data [0:out_height-1][0:out_width-1]
);

reg [7:0] x, y;
reg [7:0] x_frac, y_frac;
reg [7:0] x_int, y_int;
reg [7:0] x_int_next, y_int_next;
reg [7:0] a, b, c, d;
reg [15:0] p1, p2, p3, p4;
reg [15:0] p5, p6, p7, p8;
reg [15:0] p9, p10, p11, p12;
reg [15:0] p13, p14, p15, p16;

always @(posedge clk) begin
  if (rst) begin
    x <= 0;
    y <= 0;
    x_frac <= 0;
    y_frac <= 0;
    x_int <= 0;
    y_int <= 0;
    x_int_next <= 0;
    y_int_next <= 0;
    a <= 0;
    b <= 0;
    c <= 0;
    d <= 0;
    p1 <= 0;
    p2 <= 0;
    p3 <= 0;
    p4 <= 0;
    p5 <= 0;
    p6 <= 0;
    p7 <= 0;
    p8 <= 0;
    p9 <= 0;
    p10 <= 0;
    p11 <= 0;
    p12 <= 0;
    p13 <= 0;
    p14 <= 0;
    p15 <= 0;
    p16 <= 0;
  end else begin
    x <= x + 1;
    if (x == out_width - 1) begin
      x <= 0;
      y <= y + 1;
      if (y == out_height - 1) begin
        y <= 0;
      end
    end
    x_frac <= x[7:2];
    y_frac <= y[7:2];
    x_int <= x[1:0];
    y_int <= y[1:0];
    x_int_next <= x_int + 1;
    y_int_next <= y_int + 1;

    a <= in_data[y_int][x_int];
    b <= in_data[y_int][x_int_next];
    c <= in_data[y_int_next][x_int];
    d <= in_data[y_int_next][x_int_next];

    p1 <= a * (256 - x_frac) * (256 - y_frac);
    p2 <= b * x_frac * (256 - y_frac);
    p3 <= c * (256 - x_frac) * y_frac;
    p4 <= d * x_frac * y_frac;

    p5 <= a * (256 - x_frac) * (256 - y_frac);
    p6 <= b * x_frac * (256 - y_frac);
    p7 <= c * (256 - x_frac) * y_frac;
    p8 <= d * x_frac * y_frac;

    p9 <= a * (256 - x_frac) * (256 - y_frac);
    p10 <= b * x_frac * (256 - y_frac);
    p11 <= c * (256 - x_frac) * y_frac;
    p12 <= d * x_frac * y_frac;

    p13 <= a * (256 - x_frac) * (256 - y_frac);
    p14 <= b * x_frac * (256 - y_frac);
    p15 <= c * (256 - x_frac) * y_frac;
    p16 <= d * x_frac * y_frac;

    out_data[y][x] <= (p1 + p2 + p3 + p4) >> 16;
    out_data[y][x+1] <= (p5 + p6 + p7 + p8) >> 16;
    out_data[y+1][x] <= (p9 + p10 + p11 + p12) >> 16;
    out_data[y+1][x+1] <= (p13 + p14 + p15 + p16) >> 16;
  end
end

endmodule