fpga颜色空间转换视频演示

FPGA开源工作室

发布于 2020-11-11 12:47:07

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发布于 2020-11-11 12:47:07

文章被收录于专栏：FPGA开源工作室FPGA开源工作室

1 仿真

仿真通过vga驱动读入图片，首先经过rgb2ycbcr444算法再到ycbcr444转ycbcr422算法再到ycbcr422转ycbcr444算法最后ycbcr444再转会rgb真彩色图像，整个过程如下图所示。

2 fpga实现

fpga的实现采用hdmi输入，dvi转rgb后验证过程与仿真实现过程一致，最后通过rgb转dvi输出到hdmi口。整个过程如下图所示。

3 视频演示

3.1 rgb2ycbcr444视频效果

原文阅读：YCbCr444转YCbCr422

3.2 ycbcr444转422视频效果

原文阅读：fpga实现YCbCr422转YCbCr444

3.3 ycbcr422转ycbcr444视频效果

4 matlab整体验证

close all
clear all
clc

I=imread('1.bmp');

[H ,W ,D]=size(I);

R=double(I(:,:,1));
G=double(I(:,:,2));
B=double(I(:,:,3));

% Y0= double(zeros(H,W));
% Cb0 =double(zeros(H,W));
% Cr0 = double(zeros(H,W));

 for i = 1:H
     for j = 1:W
         Y0(i, j) = 0.299*R(i, j) + 0.587*G(i, j) + 0.114*B(i, j);
         Cb0(i, j) = -0.172*R(i, j) - 0.339*G(i, j) + 0.511*B(i, j) + 128;
         Cr0(i, j) = 0.511*R(i, j) - 0.428*G(i, j) - 0.083*B(i, j) + 128;
     end
 end 

Iycbcr(:,:,1)=Y0;
Iycbcr(:,:,2)=Cb0;
Iycbcr(:,:,3)=Cr0;

Iycbcr=uint8(Iycbcr);
% imshow(Iycbcr);

% Iycbcr=rgb2ycbcr(I);
% Y0=Iycbcr(:,:,1);
% Cb0=Iycbcr(:,:,2);
% Cr0=Iycbcr(:,:,3);
% 
% 
for i=1:1:H
    for j=2:2:W
        Cb1(i,j/2)=(Cb0(i,j-1)+Cb0(i,j))/2;
    end
end

for i=1:1:H
    for j=2:2:W
        Cr1(i,j/2)=(Cr0(i,j-1)+Cr0(i,j))/2;
    end
end

for i=1:1:H
    for j=1:1:W
        if rem(j,2)==0
         CbCr(i,j)=Cr1(i,j/2);   
        else
         CbCr(i,j)=Cb1(i,(j+1)/2); 
        end
    end
end

for i=1:1:H
    for j=1:1:W
        if rem(j,2)==0
         Cb(i,j)=Cb1(i,j/2);   
        else
         Cb(i,j)=Cb1(i,(j+1)/2); 
        end
    end
end

for i=1:1:H
    for j=1:1:W
        if rem(j,2)==0
         Cr(i,j)=Cr1(i,j/2);   
        else
         Cr(i,j)=Cr1(i,(j+1)/2); 
        end
    end
end

YCbCr(:,:,1)=Y0;
YCbCr(:,:,2)=Cb;
YCbCr(:,:,3)=Cr;

YCbCr=uint8(YCbCr);

 for i = 1:H
     for j = 1:W
         rgb(i, j,1) =Y0(i,j)+1.371*(Cr(i,j)-128);
         rgb(i, j,2) =Y0(i,j)-0.689*(Cr(i,j)-128)-0.336*(Cb(i,j)-128);
         rgb(i, j,3) =Y0(i,j)+1.732*(Cb(i,j)-128);
     end
 end 

 rgb=uint8(rgb);
 imshow(rgb);
 Y0=uint8(Y0);
 Cb0=uint8(Cb0);
 Cr0=uint8(Cr0);
 Cb1=uint8(Cb1);
 Cr1=uint8(Cr1);
 CbCr=uint8(CbCr);
 Cb=uint8(Cb);
 Cr=uint8(Cr);
  
% rgb=ycbcr2rgb(YCbCr);
% 
figure(1),
imshow(I);

figure(2),
subplot(221),imshow(Iycbcr);
subplot(222),imshow(Y0);
subplot(223),imshow(Cb0);
subplot(224),imshow(Cr0);

figure(3),
subplot(221),imshow(Cb1);
subplot(222),imshow(Cr1);
subplot(223),imshow(CbCr);

figure(4),
subplot(221),imshow(Cb);
subplot(222),imshow(Cr);
subplot(223),imshow(YCbCr);

figure(5),
subplot(221),imshow(Iycbcr);
subplot(222),imshow(YCbCr);
subplot(223),imshow(rgb);

imwrite(CbCr,'CbCr.jpg');