166 lines
5.9 KiB
Verilog
166 lines
5.9 KiB
Verilog
module demosaic2 #(
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parameter IM_WIDTH = 512, // 图像宽度
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parameter IM_HEIGHT = 256, // 图像高度
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parameter RAW_TYPE = 3 // 0:grbg 1:rggb 2:bggr 3:gbrg
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parameter DATA_SIZE = 16,
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)(
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// 基本信号
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input clk,
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input reset,
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// 数据输入信号
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input data_en,
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input [DATA_SIZE - 1:0] data_in [2:0], // 数据输入线，0、1、2分别表示第一、二、三行
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output reg data_que, // 数据请求线，高电平：请求三个数据，直到读取完才拉低
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output reg data_line, // 新一行请求数据线，高电平：请求九个数据，直到读取完才拉低
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// en: 输出数据有效信号，高电平有效
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output reg out_en,
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output reg [DATA_SIZE - 1:0] out_r,
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output reg [DATA_SIZE - 1:0] out_g,
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output reg [DATA_SIZE - 1:0] out_b
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);
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// 常量，包括状态机
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// localparam IM_SIZE = IM_HEIGHT * IM_WIDTH;
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localparam READ_DATA = 0;
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localparam COLOR_GEN = 1;
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localparam WRITE_DATA = 2;
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localparam SLIDE_WINDOW = 3;
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// 寄存器
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reg [2:0] state, nextState;
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reg [15:0] data_cache [2:0][2:0]; // 缓存颜色数据，行列3x3
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reg [11:0] pos_x, pos_y; // 滑动窗口左上角位置
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reg [1:0] cnt_data; // 记录输入数据数量，最大值256
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reg [1:0] raw_type;
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reg [15:0] red, blue, green;
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// 三段状态机实现，窗口滑动，颜色计算
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// 状态切换
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always @(posedge clk or posedge reset) begin
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if (reset)
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state <= READ_DATA;
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else
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state <= nextState;
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end
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// 下一状态更新
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always @(*) begin
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case (state)
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// 记录够3x3个数据后，进行rgb转换
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READ_DATA: nextState = (cnt_data >= 3) ? COLOR_GEN : READ_DATA;
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COLOR_GEN: nextState = WRITE_DATA;
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WRITE_DATA: nextState = SLIDE_WINDOW;
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SLIDE_WINDOW: nextState = READ_DATA;
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endcase
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end
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// 各状态执行的操作
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always @(posedge clk or posedge reset) begin
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if (reset) begin
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// 外部输出初始化
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out_en <= 0;
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out_r <= 0;
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out_g <= 0;
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out_r <= 0;
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data_que <= 0;
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data_line <= 1;
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// 内部寄存器初始化
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pos_x <= 0;
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pos_y <= 0;
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cnt_data <= 0;
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raw_type <= RAW_TYPE;
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end
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else begin
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// 状态机执行
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case (state)
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// 读取数据
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READ_DATA: begin
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data_que <= 1;
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if (cnt_data < 2)
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data_line <= 1;
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if (data_en) begin
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data_cache[cnt_data][0] <= data_in[0];
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data_cache[cnt_data][1] <= data_in[1];
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data_cache[cnt_data][2] <= data_in[2];
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cnt_data <= cnt_data + 1;
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end
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end
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COLOR_GEN: begin
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// 取消数据请求
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data_que <= 0;
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data_line <= 0;
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// 生成rgb图像
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case (raw_type)
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0: begin // Missing B, R on G
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red <= (data_cache[0][1] + data_cache[2][1]) / 2;
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blue <= (data_cache[1][0] + data_cache[1][2]) / 2;
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green <= data_cache[1][1];
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end
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1: begin // Missing G, R on B
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green <= (data_cache[0][1] + data_cache[1][0] + data_cache[1][2] + data_cache[2][1]) / 4;
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red <= (data_cache[0][0] + data_cache[0][2] + data_cache[2][0] + data_cache[2][2]) / 4;
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blue <= data_cache[1][1];
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end
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2: begin // Missing G, B on R
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green <= (data_cache[0][1] + data_cache[1][0] + data_cache[1][2] + data_cache[2][1]) / 4;
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blue <= (data_cache[0][0] + data_cache[0][2] + data_cache[2][0] + data_cache[2][2]) / 4;
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red <= data_cache[1][1];
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end
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3: begin // Missing B, R on G
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blue <= (data_cache[0][1] + data_cache[2][1]) / 2;
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red <= (data_cache[1][0] + data_cache[1][2]) / 2;
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green <= data_cache[1][1];
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end
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endcase
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raw_type <= raw_type + 1;
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end
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WRITE_DATA: begin
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out_en <= 1;
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out_r <= red;
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out_b <= blue;
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out_g <= green;
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end
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SLIDE_WINDOW: begin
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// 恢复相关寄存器变量
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out_en <= 0;
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// 记录位置寄存器自增，并处理缓存数据
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pos_x <= pos_x + 1;
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if (pos_x >= IM_WIDTH - 2) begin
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cnt_data <= 0;
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pos_x <= 0;
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pos_y <= pos_y + 1;
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if (pos_y >= IM_HEIGHT - 2)
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pos_y <= 0;
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end
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else begin
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cnt_data <= 2;
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// 窗口右移
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data_cache[0][0] <= data_cache[0][1];
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data_cache[1][0] <= data_cache[1][1];
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data_cache[2][0] <= data_cache[2][1];
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data_cache[0][1] <= data_cache[0][2];
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data_cache[1][1] <= data_cache[1][2];
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data_cache[2][1] <= data_cache[2][2];
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end
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end
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endcase
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end
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end
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endmodule
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