idct2d.asv

在matlab环境下实现dtc变换

function Y = idct2D (img)

Y = zeros(8,8);
tem = 1;

for x=1:8
    for y=1:8
        for u=1:8
            for v=1:8
                if u==1 & v~=1
                    tem =tem + (img(x,y)*cos((2*x+1)*(u-1)*pi/16)*cos((2*y+1)*(v-1)*pi/16)) / (4*sqrt(2));
        
                elseif v==1 & u~=1
                    tem = (img(x,y)*cos((2*x+1)*(u-1)*pi/16)*cos((2*y+1)*(v-1)*pi/16)) / (4*sqrt(2));
        
                elseif u==1 & v==1
                    Y(x,y) = (img(x,y)*cos((2*x+1)*(u-1)*pi/16)*cos((2*y+1)*(v-1)*pi/16)) / 8;
        
                else
                    Y(x,y) = (img(x,y)*cos((2*x+1)*(u-1)*pi/16)*cos((2*y+1)*(v-1)*pi/16)) / 4;
                end;
                
                tem=tem + ;
            end;
        end;
        

            tem = 1;
    end;
end;