RGB888 TO BT1120 转换

module datainput(DVAL,LVAL,FVAL,in,clk_m,Y_data,C_data);
input LVAL;
input clk_m;
input FVAL;
input DVAL;
input [23:0] in;
output reg [7:0] Y_data,C_data;
reg [7:0] POARTA,POARTB;
reg [11:0] cnt_lval_low,cnt_lval_high_pix;
reg [10:0] LVALcnt;
reg [9:0] y1, cr1, cb1;
reg [7:0] y,cr,cb; 
reg [7:0] R,G,B;
reg [7:0] Ytmp0,Cbtmp0,Crtmp0;

/*------------------------------------------------*/
parameter BLANKC = 8'b10000000;
parameter BLANKY = 8'b00010000;
parameter BLANKEAV = 8'b10110110;
parameter BLANKSAV = 8'b10101011;
parameter VALEAV = 8'b10011101;
parameter VALSAV = 8'b10000000;
parameter DFF = 8'b11111111;
parameter D00 = 8'b00000000;
/*------------------------------------------------*/

always @ (posedge clk_m )
begin
	R <= in[23:16];
end	
always @ (posedge clk_m )
begin
	G <= in[15:8];
end	
always @ (posedge clk_m )
begin
	B <= in[7:0];
end	
//==============================================================
always@(posedge clk_m)                                         
begin                                                       
	y1 = (66*R + 129*G + 25*B+4096)>>8;  
	y <= (y1[9:8]==2'b00) ? y1[7:0] : (y1[9]==0) ? 8'b11101011 : y1[9:2];
end                                                        
//================================================================
always@(posedge clk_m)                                            
begin  
	cb1 = (112*B-38*R - 75*G+32768)>>8; 
	cb <= (cb1[9:8]==2'b00) ? cb1[7:0] : (cb1[9]==0) ? 8'b11110000 : cb1[9:2];
end                                                           
//================================================================
always@(posedge clk_m)                                           
begin                                                        
  	cr1 = (112*R - 94*G - 18*B+32768)>>8 ; 
	cr <= (cr1[9:8]==2'b00) ? cr1[7:0] : (cr1[9]==0) ? 8'b11110000 : cr1[9:2];
end   
/*------------------------------------------------*/	


/*------------------------------------------------*/	
always@(posedge clk_m)
begin
	if(!FVAL)
	LVALcnt = 0;

else if(LVAL)
begin
	cnt_lval_high_pix=cnt_lval_high_pix+1'b1;
if(cnt_lval_high_pix==2153)
	LVALcnt = LVALcnt + 1'b1;
	end
else
	cnt_lval_high_pix=0;
end
/*------------------------------------------------*/	

always @(posedge clk_m)
 begin
 Ytmp0  <= y;
 Cbtmp0 <=cb;
 Crtmp0 <=cr;
 end	
/*-----------------------------------------------------------------------------------*/
always@(posedge clk_m)
begin
	if( (LVAL) && (LVALcnt == 16))
	begin
	
	case(cnt_lval_high_pix)
		126,2056:		 begin
						Y_data<=DFF;
						C_data<=DFF;				
					  end
		127,128,2057,2058:begin
						Y_data<=D00;
						C_data<=D00;
					  end
		129:			 begin
						Y_data<=BLANKSAV;
						C_data<=BLANKSAV;
					  end
		2059:			 begin
						Y_data<=VALEAV;
						C_data<=VALEAV;
					  end
		
		default:  begin
						Y_data<= BLANKY;
						C_data<= BLANKC;
					 end
		endcase			
	
	end
		
		else if((LVAL) && (LVALcnt == 1096))
	begin
	
	case(cnt_lval_high_pix)
		126,2056:		 begin
						Y_data<=DFF;
						C_data<=DFF;				
					  end
		127,128,2057,2058:begin
						Y_data<=D00;
						C_data<=D00;
					  end
		129:			 begin
						Y_data<=VALSAV;
						C_data<=VALSAV;
					  end
		2059:			 begin
						Y_data<=BLANKEAV;
						C_data<=BLANKEAV;
					  end
		
		default:  begin
						Y_data<= BLANKY;
						C_data<= BLANKC;
					 end
		endcase			
	
	end
	
	else if((LVAL) && (LVALcnt<=1095)&&(LVALcnt>=17))
	begin

		case(cnt_lval_high_pix)
		126,2056:		 begin
						Y_data<=DFF;
						C_data<=DFF;				
					  end
		127,128,2057,2058:begin
						Y_data<=D00;
						C_data<=D00;
					  end
		129:			 begin
						Y_data<=VALSAV;
						C_data<=VALSAV;
					  end
		2059:		 begin
						Y_data<=VALEAV;
						C_data<=VALEAV;
					  end
		
		default:  begin  
	               Y_data <= Ytmp0;
		           if(!cnt_lval_high_pix[0])
			            C_data <= Cbtmp0;
		            else
		               C_data <= Crtmp0;
					 end
		endcase			
	end
/*-----------------------------------------------------------------------------------*/	
else 
	begin

		case(cnt_lval_high_pix)
		126,2056:		 begin
						Y_data<=DFF;
						C_data<=DFF;				
					  end
		127,128,2057,2058:begin
						Y_data<=D00;
						C_data<=D00;
					  end
		129:			 begin
						Y_data<=BLANKSAV;
						C_data<=BLANKSAV;
					  end
		2059:			 begin
						Y_data<=BLANKEAV;
						C_data<=BLANKEAV;
					  end
		
		default:  begin
						Y_data<= BLANKY;
						C_data<= BLANKC;
					 end
		endcase			
	end

	
/*------------------------------------------------*/		
end 	
endmodule

先将RGB888转换成YCBCR,再将YCBCR转换成BT1120。

当 cnt_lval_high_pix 计数到2153时，LVAL翻转：

定时基准码插入：

局部放大图：