/////////////////////////////////////////////////////////////////////
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/////////////////////////////////////////////////////////////////////
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//// ////
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//// ////
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//// YCrCb to RGB Color Space converter ////
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//// YCrCb to RGB Color Space converter ////
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//// ////
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//// ////
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//// Converts YCrCb (YUV) values to RGB values ////
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//// Converts YCrCb (YUV) values to RGB values ////
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//// R = Y + 1.403Cr ////
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//// R = Y + 1.403Cr ////
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//// G = Y - 0.344Cb - 0.714Cr ////
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//// G = Y - 0.344Cb - 0.714Cr ////
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//// B = Y + 1.770Cb ////
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//// B = Y + 1.770Cb ////
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//// ////
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//// ////
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//// Author: Richard Herveille ////
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//// Author: Richard Herveille ////
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//// richard@asics.ws ////
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//// richard@asics.ws ////
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//// www.asics.ws ////
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//// www.asics.ws ////
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//// ////
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//// ////
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//// ////
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//// ////
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/////////////////////////////////////////////////////////////////////
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/////////////////////////////////////////////////////////////////////
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//// ////
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//// ////
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//// Copyright (C) 2001 Richard Herveille ////
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//// Copyright (C) 2001 Richard Herveille ////
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//// richard@asics.ws ////
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//// richard@asics.ws ////
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//// ////
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//// ////
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//// This source file may be used and distributed without ////
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//// This source file may be used and distributed without ////
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//// restriction provided that this copyright statement is not ////
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//// restriction provided that this copyright statement is not ////
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//// removed from the file and that any derivative work contains ////
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//// removed from the file and that any derivative work contains ////
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//// the original copyright notice and the associated disclaimer.////
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//// the original copyright notice and the associated disclaimer.////
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//// ////
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//// ////
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//// THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY ////
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//// THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY ////
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//// EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED ////
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//// EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED ////
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//// TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS ////
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//// TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS ////
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//// FOR A PARTICULAR PURPOSE. IN NO EVENT SHALL THE AUTHOR ////
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//// FOR A PARTICULAR PURPOSE. IN NO EVENT SHALL THE AUTHOR ////
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//// OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, ////
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//// OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, ////
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//// INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES ////
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//// INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES ////
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//// (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE ////
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//// (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE ////
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//// GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR ////
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//// GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR ////
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//// BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF ////
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//// BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF ////
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//// LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT ////
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//// LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT ////
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//// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT ////
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//// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT ////
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//// OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE ////
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//// OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE ////
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//// POSSIBILITY OF SUCH DAMAGE. ////
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//// POSSIBILITY OF SUCH DAMAGE. ////
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//// ////
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//// ////
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/////////////////////////////////////////////////////////////////////
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/////////////////////////////////////////////////////////////////////
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// CVS Log
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// CVS Log
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//
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//
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// $Id: ycrcb2rgb.v,v 1.1.1.1 2002-03-26 07:25:09 rherveille Exp $
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// $Id: ycrcb2rgb.v,v 1.1.1.1 2002-03-26 07:25:09 rherveille Exp $
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//
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//
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// $Date: 2002-03-26 07:25:09 $
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// $Date: 2002-03-26 07:25:09 $
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// $Revision: 1.1.1.1 $
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// $Revision: 1.1.1.1 $
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// $Author: rherveille $
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// $Author: rherveille $
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// $Locker: $
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// $Locker: $
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// $State: Exp $
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// $State: Exp $
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//
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//
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// Change History:
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// Change History:
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// $Log: not supported by cvs2svn $
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// $Log: not supported by cvs2svn $
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`timescale 1ns/10ps
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`timescale 1ns/10ps
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module ycrcb2rgb(clk, ena, y, cr, cb, r, g, b);
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module ycrcb2rgb(clk, ena, y, cr, cb, r, g, b);
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//
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//
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// inputs & outputs
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// inputs & outputs
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//
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//
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input clk;
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input clk;
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input ena;
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input ena;
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input [9:0] y, cr, cb;
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input [9:0] y, cr, cb;
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output [9:0] r, g, b;
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output [9:0] r, g, b;
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reg [9:0] r, g, b;
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reg [9:0] r, g, b;
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reg [9:0] dy, dcr, dcb;
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reg [9:0] dy, dcr, dcb;
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//
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//
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// variables
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// variables
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//
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//
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reg [22:0] ir, ig, ib;
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reg [22:0] ir, ig, ib;
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//
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//
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// module body
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// module body
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//
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//
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// step 1: Calculate R, G, B
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// step 1: Calculate R, G, B
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//
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//
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// Use N.M format for multiplication:
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// Use N.M format for multiplication:
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// R = Y + 1.403Cr = Y + Cr + 0.403Cr
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// R = Y + 1.403Cr = Y + Cr + 0.403Cr
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// R = Y + Cr + 0x19C*Cr
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// R = Y + Cr + 0x19C*Cr
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//
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//
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// G = Y - 0.344Cb - 0.714Cr
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// G = Y - 0.344Cb - 0.714Cr
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// G = Y - 0x160*Cb - 0x2DB*Cr
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// G = Y - 0x160*Cb - 0x2DB*Cr
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//
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//
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// B = Y + 1.770Cb = Y + Cb + 0.770Cb
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// B = Y + 1.770Cb = Y + Cb + 0.770Cb
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// B = Y + Cb + 0x314*Cb
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// B = Y + Cb + 0x314*Cb
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// delay y, cr and cb
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// delay y, cr and cb
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always@(posedge clk)
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always@(posedge clk)
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if (ena)
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if (ena)
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begin
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begin
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dy <= #1 y;
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dy <= #1 y;
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dcr <= #1 cr;
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dcr <= #1 cr;
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dcb <= #1 cb;
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dcb <= #1 cb;
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end
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end
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// calculate R
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// calculate R
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reg [19:0] rm;
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reg [19:0] rm;
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always@(posedge clk)
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always@(posedge clk)
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if (ena)
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if (ena)
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begin
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begin
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rm <= #1 10'h19C * cr;
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rm <= #1 10'h19C * cr;
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ir <= #1 ( (dy + dcr) << 10) + rm;
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ir <= #1 ( (dy + dcr) << 10) + rm;
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end
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end
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// calculate G
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// calculate G
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reg [19:0] gm1, gm2;
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reg [19:0] gm1, gm2;
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always@(posedge clk)
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always@(posedge clk)
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if (ena)
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if (ena)
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begin
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begin
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gm1 <= #1 10'h160 * cb;
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gm1 <= #1 10'h160 * cb;
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gm2 <= #1 10'h2DB * cr;
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gm2 <= #1 10'h2DB * cr;
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ig <= #1 (dy << 10) - (gm1 + gm2);
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ig <= #1 (dy << 10) - (gm1 + gm2);
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end
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end
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// calculate B
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// calculate B
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reg [19:0] bm;
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reg [19:0] bm;
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always@(posedge clk)
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always@(posedge clk)
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if (ena)
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if (ena)
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begin
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begin
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bm <= #1 10'h314 * cb;
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bm <= #1 10'h314 * cb;
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ib <= #1 ( (dy + dcb) << 10) + bm;
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ib <= #1 ( (dy + dcb) << 10) + bm;
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end
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end
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//
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//
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// step2: check boundaries
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// step2: check boundaries
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//
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//
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always@(posedge clk)
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always@(posedge clk)
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if (ena)
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if (ena)
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begin
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begin
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// check R
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// check R
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r <= #1 (ir[19:10] & {10{!ir[22]}}) | {10{(!ir[22] && (ir[21] || ir[20]))}};
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r <= #1 (ir[19:10] & {10{!ir[22]}}) | {10{(!ir[22] && (ir[21] || ir[20]))}};
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// check G
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// check G
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g <= #1 (ig[19:10] & {10{!ig[22]}}) | {10{(!ig[22] && (ig[21] || ig[20]))}};
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g <= #1 (ig[19:10] & {10{!ig[22]}}) | {10{(!ig[22] && (ig[21] || ig[20]))}};
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// check B
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// check B
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b <= #1 (ib[19:10] & {10{!ib[22]}}) | {10{(!ib[22] && (ib[21] || ib[20]))}};
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b <= #1 (ib[19:10] & {10{!ib[22]}}) | {10{(!ib[22] && (ib[21] || ib[20]))}};
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end
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end
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endmodule
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endmodule
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