[問題]計算10bits色溫

看板MATLAB作者immortal1314 (Eden)時間8年前 (2016/08/04 01:25)推噓2(2推 0噓 29→)

留言31則, 3人參與討論串1/4 (看更多)

我要算每一個顏色與對應灰階的色溫值但是記憶體不足(要24G以上才算的完有可能更多) 無法算完請問有其他寫法嗎? 1.只算我想要的色溫的x,y範圍 (可以給定一個誤差是可以接受的) 但我不知道怎從色溫反推x,y 因為目標光的RGB有可能是不同灰階相加而得所以R G B的灰階數不一定相等 R的x,y,Y G的x,y,Y B的x,y,Y 轉換成各自的XYZ後 RX+GX+BX=WX RY+GY+BY=WY RZ+GZ+BZ=WZ 再得到新的x,y,Y才有辦法算出色溫所以用某個色溫反推我推不回去... 2.能夠把值算完但不會撐爆記憶體全部算完再取出我要的色溫看用哪幾組RGB(xyY) (我目前只會這個但是記憶體爆了而且算超久所以不能用) 希望能有改進的發法 data是我量測的資料 W0_x=data(:,2); W0_y=data(:,3); W0_Y=data(:,4); R0_x=data(:,10); R0_y=data(:,11); G0_x=data(:,13); G0_y=data(:,14); B0_x=data(:,16); B0_y=data(:,17); _ for i=1:256 a1(i)=(R0_x(i)-W0_x(i))/(R0_y(i)); b1(i)=(G0_x(i)-W0_x(i))/(G0_y(i)); c1(i)=(B0_x(i)-W0_x(i))/(B0_y(i)); a2(i)=(R0_y(i)-W0_y(i))/(R0_y(i)); b2(i)=(G0_y(i)-W0_y(i))/(G0_y(i)); c2(i)=(B0_y(i)-W0_y(i))/(B0_y(i)); end RY=b1.*c2-c1.*b2; GY=c1.*a2-c2.*a1; BY=a1.*b2-b1.*a2; for i=1:256 RY01(i)=RY(i)/(RY(i)+GY(i)+BY(i))*W0_Y(i); GY01(i)=GY(i)/(RY(i)+GY(i)+BY(i))*W0_Y(i); BY01(i)=BY(i)/(RY(i)+GY(i)+BY(i))*W0_Y(i); end new_R=RY01; new_G=GY01; new_B=BY01; new_W=new_R+new_G+new_B; %calculate xyY to XYZ 1 %Red R_x=data(:,10); R_y=data(:,11); R_Y=new_R; t1=0:4:1020; t1 = t1'; t=0:1:1020; t=t'; R_x=pchip(t1,R_x,t); R_y=pchip(t1,R_y,t); R_Y=pchip(t1,R_Y,t); for i=1:1021 R_X(i)=(R_x(i)*R_Y(i))/(R_y(i)); R_Z(i)=(1-R_x(i)-R_y(i))*(R_Y(i))/(R_y(i)); end %Green G_x=data(:,13); G_y=data(:,14); G_Y=new_G; G_x=pchip(t1,G_x,t); G_y=pchip(t1,G_y,t); G_Y=pchip(t1,G_Y,t); for i=1:1021 G_X(i)=(G_x(i)*G_Y(i))/(G_y(i)); G_Z(i)=(1-G_x(i)-G_y(i))*(G_Y(i))/(G_y(i)); end %Blue B_x=data(:,16); B_y=data(:,17); B_Y=new_B; B_x=pchip(t1,B_x,t); B_y=pchip(t1,B_y,t); B_Y=pchip(t1,B_Y,t); for i=1:1021 B_X(i)=(B_x(i)*B_Y(i))/(B_y(i)); B_Z(i)=(1-B_x(i)-B_y(i))*(B_Y(i))/(B_y(i)); end %calculate xyY to XYZ 2 new_X=R_X+G_X+B_X; new_Y=R_Y+G_Y+B_Y; new_Z=R_Z+G_Z+B_Z; %calculate XYZ to new xyz (for CCT) for i=1:1021 for j=1:1021 for k=1:1021 new0_x(i,j,k)=(new_X(i))/(new_X(i)+new_Y(j)+new_Z(k)); new0_y(i,j,k)=(new_Y(j))/(new_X(i)+new_Y(j)+new_Z(k)); end end end %color temperature xe=0.3366; ye=0.1735; A0=-949.86315; A1=6253.80338; t1=0.92159; A2=28.70599; t2=0.20039; A3=0.00004; t3=0.07125; cct0001=zeros(1021,1021,1021,4); for i = 1 : 1021 for j = 1 : 1021 for k = 1 : 1021 n = (new0_x(i,j,k)-xe)/(new0_y(i,j,k)-ye); ccolor_temperature(i,j,k,4)= A0+A1*exp(-n/t1)+A2*exp(-n/t2)+A3*exp(-n/t3); end end end 這我想來想去想不出所以然... -- ※ 發信站: 批踢踢實業坊(ptt.cc), 來自: 122.146.82.231 ※ 文章網址: https://www.ptt.cc/bbs/MATLAB/M.1470245140.A.165.html

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sunev

08/04 02:44, , 1^F

08/04 02:44, 1^F

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