RGB转换到YUV程序注释.doc

RGB转换到YUV程序注释Y= CA(RG )+ G+ CB* (BG)+YOFFSETV=Cr = CC(RY)+ COFFSETU=Cb = CD(BY)+ COFFSETY=0.299*(R-G)+G+0.114*(B-G)+2(12-4)=0.299R+0.587G+0.114B+2(12-4);U=0.492*（B-Y）+211 = -0.148R-0.289G+0.437B+211;V=0.877(R-Y)+211 = 0.615R-0.515G-0.100B+211；补偿后输出都为正数数字系统求Y,Cr,Cb 系数CA=0.299,CB=0.114,CC=0.713,CD=0.564本系统延迟5个时钟？module RGBtoYUV(R_in,G_in,B_in,clk0,qY,qU,qV);input wire 11:0 R_in,G_in,B_in; /输入RGB数据output wire 11:0 qY,qU,qV; /输出YUV数据input wire clk0; /时钟wire 12:0 R_G, B_G,Yno;/wire coutR_G,coutB_G,coutRB_G,coutR_Y,coutB_Y;reg 11:0 Gbuf1,Gbuf2,Gbuf3,Gbuf4;reg 11:0 Rbuf1,Rbuf2,Rbuf3,Rbuf4,Bbuf1,Bbuf2,Bbuf3,Bbuf4;wire 11:0 R4,B4;wire 22:0 R_Gby306,B_Gby116;wire 23:0 Ycrno,Ycbno;wire 12:0 B_Y,R_Y,RB_G;assign R4=Rbuf4;assign B4=Bbuf4;signedSUB13 RminsG_inst( .clock(clk0), /求R_G.dataa(1b0,R_in),.datab(1b0,G_in),/.cout(coutR_G),.result(R_G);signedSUB13 BminsG_inst( .clock(clk0),.dataa(1b0,B_in),.datab(1b0,G_in),/.cout(coutB_G),.result(B_G);/ mult 0.299=0.299*1024=306,放大1024倍相乘mul306 R_Gby306_inst(.clock(clk0),.dataa(R_G),.result(R_Gby306);/116=0.114*1024 放大1024倍mul116 B_Gby116_inst(.clock(clk0),.dataa(B_G),.result(B_Gby116);/=R_Gby306/1024+B_Gby116/1024加法并缩小1024倍ADD13 RB_G_inst(.clock(clk0),.dataa(R_Gby30622:10),.datab(B_Gby11622:10),/.cout(coutRB_G),.result(RB_G);/加上G ADD13 Yno_offset_inst(.clock(clk0),.dataa(1b0,Gbuf3),/由于RG_B延迟了所以要用延迟后的绿色G.datab(RB_G), /divide 1024.result(Yno);/Yno 没有加上偏移系数YOFFSET=28，/求R-Yno 延迟1个signedSUB13 R_Y_inst( .clock(clk0),.dataa(1b0,R4),.datab(Yno),/.cout(coutR_Y),.result(R_Y);/ 求=B4-Yno signedSUB13 B_Y_inst( .clock(clk0),.dataa(1b0,B4),.datab(Yno),/.cout(coutB_Y),.result(B_Y);/求出U（Ycrno）没有加上偏移系数，放大了1024倍mult898 Cr_inst(.clock(clk0),.dataa(R_Y),.result(Ycrno);/求出V（Ycbno） 放大了1024倍mult504 Cb_inst(.clock(clk0),.dataa(B_Y),.result(Ycbno);/assign B_Y12=coutB_Y;/assign R_Y12=coutR_Y;/assign B_G12=coutB_G;/assign B_G12=coutR_G;assign qY=Yno12:0+13h0100; /加上偏移系数2(12-4)=28assign qU=Ycbno23:10+13h0800;/ =Ycbno/1024assign qV=Ycrno23:10+13h0800; always (posedge clk0 )beginGbuf1=G_in;Gbuf2=Gbuf1;Gbuf3=Gbuf2;Gbuf4=Gbuf3;/Gbuf5=Gbuf4;/Gbuf6=Gbuf5;/Gbuf7=Gb