A Simple Framework for 3D Lensless Imaging with Programmablle Masks 論文代碼部分

代碼介紹原文:
1.代碼結(jié)構(gòu)
1.1 data數(shù)據(jù)
- net
在這里插入圖片描述
2. scripts_preset.m 代碼
2.1 代碼整體介紹
這段代碼的作用是加載PSFs數(shù)據(jù),并進行一系列參數(shù)設(shè)置。
-
首先,通過設(shè)置
data_dir
變量為數(shù)據(jù)目錄的路徑。然后,根據(jù)場景名來選擇特定于場景的參數(shù)。根據(jù)不同的場景名,設(shè)置d1
和d2
的值。 -
net 場景包括一個距離相機約30mm的網(wǎng)狀物和一個距離網(wǎng)狀物后方約100mm的橡皮鴨。
%% 加載 psfs 數(shù)據(jù)
data_dir = '../data'; % 設(shè)置數(shù)據(jù)目錄
scene_name = 'net'; % 設(shè)置場景名稱
% -- SCENE
% 選擇特定于場景的參數(shù)
switch scene_name
% 若場景名為“toys”(玩具),設(shè)置d1為80,d2為600
case 'toys'
d1 = 80; d2 = 600;
% 若場景名為“two_cards”(兩張卡片),設(shè)置d1為35,d2為200
case 'two_cards'
d1 = 35; d2 = 200;
% 若場景名為“net”(網(wǎng)),設(shè)置d1為20,d2為300
case 'net'
d1 = 20; d2 = 300;
% 若場景名為“carrot”(蘿卜),設(shè)置d1為15,d2為300
case 'carrot'
d1 = 15; d2 = 300;
end
-
設(shè)置
masktype
變量來選擇掩膜類型,可選的類型有"random"(隨機)、“mls”(最小二乘)、“opt”(優(yōu)化)和"shiftXY"(XY移位)。根據(jù)選擇的掩膜類型不同,代碼會設(shè)置不同的掩膜序列。 -
設(shè)置
nmask
和ndepth
的值,分別表示掩膜數(shù)量和深度數(shù)量。% -- MASKTYPE % 設(shè)置掩膜類型,可選項有 "random"(隨機)、"mls"(最少二乘)、"opt"(優(yōu)化) 和 "shiftXY"(XY移位) % masktype = 'random' % masktype = 'mls' masktype = 'opt' % masktype = 'shiftXY' % -- NUM OF MASKS AND DEPTHS % 設(shè)置掩膜數(shù)量為8,深度數(shù)量也為8 nmask = 8; ndepth = 8;
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接下來,設(shè)置
recon_method
變量來選擇重建方法,可選的方法有"adap_l2"
(自適應(yīng)L2)和"t_svd"
(基于是否有GPU設(shè)備設(shè)置為張量奇異值分解)。 -
如果沒有檢測到
GPU
設(shè)備,則將重建方法設(shè)置為"t_svd"
。% -- METHOD % 設(shè)置重建方法為 'adap_l2'(自適應(yīng)L2),或者基于是否有GPU設(shè)備設(shè)置為 't_svd'(張量奇異值分解) recon_method = 'adap_l2' % recon_method = 't_svd' % 如果沒有檢測到GPU設(shè)備,則將重建方法設(shè)置為't_svd' if gpuDeviceCount < 1 recon_method = 't_svd'; end
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加載文件
% 根據(jù)設(shè)置的數(shù)據(jù)目錄加載PSFs數(shù)據(jù)文件 load(sprintf('%s/psfs-fullsize-cg-bin8.mat', data_dir)); disp(dists)
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字典內(nèi)包含三部分
-
dists
-
mask_names
-
psfs
-
-
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相機參數(shù)設(shè)置
% 相機參數(shù)預(yù)設(shè) Ho = 3648 / 2; %圖像的高度 Wo = 5472 / 2; %圖像的寬度 mask_depth = 10.51; %掩膜距離傳感器的距離 bin_size = 8; cam_pitch = 2.4 * 1e-3; %相機的像素距離,以毫米為單位 cam_chnl_pitch = cam_pitch * 2 * bin_size; %是通道間的距離,通過將相機像素間距乘以2和二進制大小來計算。 d = mask_depth; z2a = @(z) 1-d./z; % 深度到a的轉(zhuǎn)換函數(shù) a2z = @(a) d./(1-a); % a到深度的轉(zhuǎn)換函數(shù) % 計算深度范圍 depth_range = a2z(linspace(z2a(d1), z2a(d2), ndepth));
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根據(jù)選擇的掩膜類型,選擇原始測量數(shù)據(jù)和
PSFs
(點擴散函數(shù))進行恢復(fù)。%% 選擇原始測量數(shù)據(jù)和PSFs進行恢復(fù) % 根據(jù)掩膜類型選擇隨機二值掩膜 switch masktype % 如果掩膜類型為'random',選擇序列中的第6至第25個掩膜 case 'random' mask_seq = 6:25; ind1 = mask_seq(1:nmask); ind2 = mask_seq(nmask+1)*ones(length(ind1),1); % 如果掩膜類型為'mls',選擇序列中的第47至第66個掩膜 case 'mls' mask_seq = 47:66; ind1 = 47:2:47+nmask*2-1; ind2 = 48:2:47+nmask*2-1; % 如果掩膜類型為'opt',選擇序列中的第27至第46個掩膜 case 'opt' mask_seq =27:46; ind1 = 27:2:27+nmask*2-1; ind2 = 28:2:27+nmask*2-1; % 如果掩膜類型為'shiftXY',選擇序列中的第67至第102個掩膜 case 'shiftXY' mask_seq = 67:102; ind1 = 67:2:67+nmask*2-1; ind2 = 68:2:67+nmask*2-1; end
3 demo_block_diagonal.m 代碼
3.1 代碼介紹
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參數(shù)初始化
%定義一個函數(shù),該函數(shù)接受一個圖像數(shù)組和圖像名稱,將其轉(zhuǎn)化為RGB格式并播放 %H×W×C×N ===> H×W×N×C play_rggb_stack = @(im, names)play_stack(rggb2rgb(permute(im, [1 3 4 2])), names); % 定義一個函數(shù),用于顯示歸一化的圖像 imshowsm = @(im)imshow(mat2gray(squeeze(im))); % 定義一個函數(shù),用于找到最大值并規(guī)范化 max1 = @(x) x/max(abs(x(:))); run('scripts_preset'); %設(shè)置實驗ID expid = 1; %% % 初始化圖像大小和點擴散函數(shù)(PSF)大小 ims_size = [228, 342]; psf_size = [228, 342]; % 獲取掩膜數(shù)量 nmask = length(ind2); % 初始化存儲圖像序列和點擴散函數(shù)校準序列的數(shù)組 ims_stack = zeros([nmask, 4, ims_size]); psf_calib_stack = zeros([nmask,length(dists), 4, psf_size]); mask_stack = zeros(nmask, 769, 1024); % 定義一個函數(shù),用于將數(shù)組填充到最大尺寸 padmax = @(x) padarray(x, (psf_size - size(x))/2, 0, 'both');
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讀取數(shù)據(jù)
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為什么要存儲掩膜數(shù)據(jù)的差值?
GPT
:? 存儲差值的目的是為了在后續(xù)的重建過程中,使用這些差值來恢復(fù)被遮擋的信息。差值代表了兩個不同掩膜之間的區(qū)別,這 些差值可以用于去除遮擋區(qū)域或恢復(fù)遮擋區(qū)域的信息。
? 通過存儲差值,可以在后續(xù)的重建過程中利用它們來改善圖像重建的質(zhì)量和準確性。
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data_dir = ‘…/data’
scene_name = ‘net’
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mask_seq =27:46;
ind1 = 27:2:27+nmask2-1;
ind2 = 28:2:27+nmask2-1;
% 循環(huán)讀取不同掩膜的圖像和PSF校準數(shù)據(jù) for ii = 1:nmask % 讀取圖像數(shù)據(jù) im2 = im2double(imread(sprintf('%s/%s/%s.png',data_dir, scene_name, mask_names{ind2(ii)}))); im1 = im2double(imread(sprintf('%s/%s/%s.png',data_dir, scene_name, mask_names{ind1(ii)}))); % 讀取掩膜數(shù)據(jù)并存儲差值 mask1 = im2double(imread(sprintf('%s/masks/%s.png',data_dir, mask_names{ind1(ii)}))); mask2 = im2double(imread(sprintf('%s/masks/%s.png',data_dir, mask_names{ind2(ii)}))); mask_stack(ii, :,:) = mask1 - mask2; % 對圖像數(shù)據(jù)進行去馬賽克,并對像素進行合并 im_rggb = debayer(im1 - im2); % (height, width, channels) 重排列為 (channels, height, width),然后均值池化 im_rggb = bin_pixels( reshape(permute(im_rggb, [3 1 2]), [1, 4, Ho, Wo]), bin_size); ims_stack(ii,:,:,:) = im_rggb; % 循環(huán)不同的景深處理點擴散函數(shù)(PSF) for use_d = 1:5 psf = padmax(psfs{ind1(ii), use_d}) - padmax(psfs{ind2(ii), use_d}); psf = repmat(reshape(psf, 1, 1, psf_size(1), psf_size(2)), 1, 4, 1, 1); psf_calib_stack(ii,use_d,:,:,:) = psf; end fprintf('\n read in data for mask %02d', ii); end
**附:**bin_pixels函數(shù),這個函數(shù)是一個用于將圖像進行均值池化的函數(shù)。
? 輸入?yún)?shù):
- im: 輸入圖像,維度為(N, C, H, W),其中N為圖像的數(shù)量,C為圖像的通道數(shù),H為圖像的高度,W為圖像的寬度。
- bin_size: 池化操作的窗口大小。
function out = bin_pixels(im, bin_size) %im: (N, C, H, W) %bin_size:int kernel = ones(bin_size); kernel = kernel / sum(kernel(:)); half_bin = round(bin_size/2); ys = 1:bin_size:(size(im,3)-bin_size+1); xs = 1:bin_size:(size(im,4)-bin_size+1); out = zeros(size(im,1), size(im,2), length(ys), length(xs)); for i = 1:size(im,1), for j = 1:size(im,2), tmp = conv2(squeeze(im(i,j,:,:)), kernel, 'valid'); out(i,j,:,:) = tmp(ys, xs); end; end end
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-
計算每個掩膜對應(yīng)的多深度PSF,創(chuàng)建PSF和圖像的FFT堆棧
% 設(shè)置深度范圍 im_z = depth_range; ndepth = length(im_z); zs = im_z; % 坐標轉(zhuǎn)換 cam_size = size(ims_stack); cam_size = cam_size(3:end); C = size(ims_stack,2); %初始化PSF堆棧 psf_stack = zeros([nmask, ndepth, 4, psf_size]); % 循環(huán)計算每個掩膜對應(yīng)的多深度PSF for ii = 1:nmask for d = 1:ndepth z = zs(d); z_ind = 2; % Compute beta, psf at z, by interpolating from nearest captured. % 通過插值計算z處的PSF beta = zeros([C psf_size]); % scale_fun = @(z, z0)((z0-mask_depth) * z)/((z-mask_depth) * z0); %d in mm scale_fun = @(z, z0)(z0 * (z + mask_depth)) / (z * (z0 + mask_depth)); % 深度以毫米為單位 a1_over_a0 = scale_fun(z, dists(z_ind)); % direct interp for right size直接插值到正確的尺寸 [x, y] = meshgrid(linspace(-.5, .5, psf_size(2)), linspace(-.5, .5, psf_size(1))); for c = 1:C alpha = anti_alias(squeeze(psf_calib_stack(ii,z_ind , c, :, :)), a1_over_a0); beta(c, :, :) = interp2(x, y, alpha, ... x / a1_over_a0, y / a1_over_a0, ... 'linear', 0); end psf_stack(ii, d, :,:,:) = beta; end end %% create fft stacks of PSF and ims%% 創(chuàng)建PSF和圖像的FFT堆棧 full_size = ims_size + psf_size - 1; % 定義完整尺寸 psf_fft_stack = zeros([nmask, ndepth, 4, full_size]); % 初始化PSF的FFT堆棧 ims_fft_stack = zeros([nmask, 4, full_size]); % 初始化圖像的FFT堆棧
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傅里葉變換
for ii = 1:nmask for di = 1:ndepth for c = 1:C % 對PSF和圖像進行FFT變換 psf_fft_stack(ii, di, c, :,:) = fft2(squeeze(psf_stack(ii, di, c, :,:)), full_size(1),full_size(2)); ims_fft_stack(ii,c,:,:) = fft2( pad_and_center(squeeze(ims_stack(ii, c, :,:)), full_size), full_size(1), full_size(2)); end end end
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重建
計算了正則化項
lambda_mat
,然后將其添加到AtA_gpu
中。正則項的計算是通過將最大的特征值乘以0.05來實現(xiàn)的。這樣,代碼實現(xiàn)了在最小二乘問題中添加正則項的功能。lambda_mat = repmat(eye(ndepth),[1,1, size(Ac_piece, 3) ]) .* reshape( max(reshape(squeeze(sqrt(sum(sum(abs(AtA_gpu).^2,1),2))), [], 1) * 0.05,200) ,1,1,size(Ac_piece,3)) ; AtA_gpu = AtA_gpu + lambda_mat;
for c = 1:C Ac = squeeze(psf_fft_stack(:,:,c,:,:)); % 提取c通道的PSF FFT bc = ims_fft_stack(:,c,:,:); % 提取c通道的圖像FFT switch recon_method % 根據(jù)重建方法進行選擇 case 'adap_l2' % reconstruction with GPU npiece = 35; % 將數(shù)據(jù)劃分為多個塊以適應(yīng)GPU運算 Ac_piece = reshape(Ac, nmask, ndepth, [], npiece); bc_piece = reshape(bc, nmask, 1 , [], npiece); xhat_fft_gpu = zeros(ndepth, 1, size(Ac_piece,3), npiece); for pp = 1:npiece % 將數(shù)據(jù)移至GPU進行計算 % move Ac and bc onto gpu Ac_gpu = gpuArray(Ac_piece(:,:,:,pp)); bc_gpu = gpuArray(bc_piece(:,:,:,pp)); % L2 regularization based on frobenius norm of AtA基于AtA的Frobenius范數(shù)的L2正則化 AtA_gpu = pagefun( @mtimes, pagefun(@ctranspose, Ac_gpu), Ac_gpu); %lambda_mat = repmat(eye(ndepth),[1,1, size(Ac_piece, 3) ]) .* reshape( max(vec(squeeze(sqrt(sum(sum(abs(AtA_gpu).^2,1),2)))) * 0.05,200) ,1,1,size(Ac_piece,3)) ; lambda_mat = repmat(eye(ndepth),[1,1, size(Ac_piece, 3) ]) .* reshape( max(reshape(squeeze(sqrt(sum(sum(abs(AtA_gpu).^2,1),2))), [], 1) * 0.05,200) ,1,1,size(Ac_piece,3)) ; AtA_gpu = AtA_gpu + lambda_mat; clear lambda_mat %計算重建的FFT xhat_fft_gpu(:,:,:,pp) = gather(pagefun(@mtimes, pagefun(@mldivide, ... AtA_gpu, ... pagefun(@ctranspose, Ac_gpu)), bc_gpu)); end xhat_fft_gpu = reshape(xhat_fft_gpu, ndepth, 1, []); xhat_FFT_stack = permute(gather(reshape(xhat_fft_gpu,ndepth, full_size(1),full_size(2))),[2,3,1]); %通過IFFT換回空間域并取實部 xhat_full(:,:,c,:) = real(ifft2(xhat_FFT_stack)); case 't_svd' % reconstruction without GPU (省略) end fprintf('\n%02d/%02d color channels completed', c, C); end
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其他處理
% 將RGGB轉(zhuǎn)換為RGB格式 xhat_full_rgb = rggb2rgb(permute(xhat_full,[4,1,2,3])); %% rotate/shift % 創(chuàng)建保存文件夾 % 根據(jù)實驗ID、掩碼類型和深度索引創(chuàng)建一個保存文件夾路徑 save_folder = fullfile('../results',sprintf('%03d',expid),sprintf('masktype_%s',masktype),sprintf('bd_nd%02d_nm%02d',ndepth,length(ind2))); % 如果文件夾不存在,則創(chuàng)建該文件夾 if ~exist(save_folder,'dir') mkdir(save_folder); end % 圖像預(yù)處理 % 將xhat_full_rgb轉(zhuǎn)換為灰度圖像格式 xhat_full_rgb = mat2gray(xhat_full_rgb); % 初始化一個新的圖像數(shù)組xhat_rgb xhat_rgb = zeros([ ndepth ,cam_size, 3 ]); % 旋轉(zhuǎn)/移位圖像 % 對于每個深度層,將圖像旋轉(zhuǎn)180度并根據(jù)點擴散函數(shù)尺寸進行移位裁剪 for di = 1:ndepth xhat_tmp = squeeze(xhat_full_rgb(di,:,:,:)); xhat_tmp = circshift(rot90(xhat_tmp,2), -(psf_size-1)); xhat_tmp = xhat_tmp(1:cam_size(1), 1:cam_size(2),:); xhat_rgb(di, :,:,:) = xhat_tmp; end % % 將處理后的RGB圖像再次轉(zhuǎn)換為灰度圖像格式 xhat_rgb = mat2gray(xhat_rgb);
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去噪
%% BM3D denoising % tic; % xhat_rgb_denoised = zeros(size(xhat_rgb)); % for di = 1:ndepth % for ci = 1:3 % xhat_rgb_denoised(di,:,:,ci) = BM3D(squeeze(xhat_rgb(di,:,:,ci)),0.035); % end % fprintf('\n depth %02d/%02d is denoised', di, ndepth); % end % xhat_rgb = xhat_rgb_denoised; % t_bm3d = toc; %% TV-L1 denoising (optional denoising method) tic; xhat_rgb_denoised = zeros(size(xhat_rgb)); for di = 1:ndepth for ci = 1:3 xhat_rgb_denoised(di,:,:,ci) = TVL1denoise(squeeze(xhat_rgb(di,:,:,ci)),1.3,100); end fprintf('\n depth %02d/%02d is denoised', di, ndepth); end xhat_rgb = xhat_rgb_denoised; t_tvl1 = toc;
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其他操作
%% crop images % 裁剪圖像 % 對圖像進行裁剪,只保留感興趣的區(qū)域 xhat_rgb_crop = permute((xhat_rgb(:,40:187,36:309,:)),[2,3,4,1]); % 創(chuàng)建存儲裁剪后原始結(jié)果的文件夾 save_folder1 = fullfile(save_folder,'raw_results'); if ~exist(save_folder1, 'dir') mkdir(save_folder1); end % 將裁剪后的圖像保存為圖像文件并創(chuàng)建動畫gif文件 for di = 1:ndepth xhat_rgb_crop(:,:,:,di) = (xhat_rgb_crop(:,:,:,di)); imagesc(xhat_rgb_crop(:,:,:,di)); axis image off; % title(sprintf('%3.5g mm', depth_range(di))); export_fig(fullfile(save_folder1,sprintf('final_result_scene_%s_depth_%02d',scene_name,di))); frame = export_fig; ims{di} = frame; end filename = fullfile(save_folder1,sprintf('anime_result_scene_%s.gif',scene_name)); % Specify the output file name for idx = 1:ndepth [A,map] = rgb2ind(ims{idx},256); if idx == 1 imwrite(A,map,filename,'gif','LoopCount',Inf,'DelayTime',1*(8/ndepth)); else imwrite(A,map,filename,'gif','WriteMode','append','DelayTime',1*(8/ndepth)); end end
% 調(diào)整對比度以便輸出 % 創(chuàng)建存儲調(diào)整對比度后的結(jié)果的文件夾 %% adjust contrast for exporting save_folder2 = fullfile(save_folder,'color_adjusted_results'); if ~exist(save_folder2, 'dir') mkdir(save_folder2); end % 設(shè)置對比度調(diào)整后處理參數(shù) % color adjustment post-processing parameter if strcmp(recon_method,'adap_l2') r = 0.005; else r = 0.001; end % 調(diào)整圖像對比度并保存為圖像文件 xhat_tmp = permute(xhat_rgb_crop, [1,2,4,3]); xhat_tmp_size = size(xhat_tmp); xhat_tmp_vec = reshape(xhat_tmp, [],1,3); xhat_tmp_adjust = imadjust(xhat_tmp_vec, stretchlim(xhat_tmp_vec, [r,1-r]),[]); xhat_adjust = permute(reshape(xhat_tmp_adjust, xhat_tmp_size),[1,2,4,3]); ims = {}; for di = 1:ndepth imagesc(xhat_adjust(:,:,:,di)); axis image off; export_fig(fullfile(save_folder2,sprintf('blockDiagonal_scene_%s_depth_%02d',scene_name,di))); frame = export_fig; ims{di} = frame; end filename = fullfile(save_folder2,sprintf('anime_result_scene_%s_adjusted.gif',scene_name)); % Specify the output file name for idx = 1:ndepth [A,map] = rgb2ind(ims{idx},256); if idx == 1 imwrite(A,map,filename,'gif','LoopCount',Inf,'DelayTime',1*(8/ndepth)); else imwrite(A,map,filename,'gif','WriteMode','append','DelayTime',1*(8/ndepth)); end end % 保存所有處理后的數(shù)據(jù) % 將所有相關(guān)的變量和處理后的圖像數(shù)據(jù)保存到.mat文件中 %% save all the processed data %xhat_full_rgb: 完整的RGB圖像數(shù)據(jù) %xhat_rgb: RGB圖像數(shù)據(jù) %xhat_rgb_crop: 裁剪后的RGB圖像數(shù)據(jù) %xhat_adjust: 調(diào)整后的RGB圖像數(shù)據(jù) %depth_range: 深度范圍 %scene_name: 場景名稱 %masktype: 掩模類型 save(fullfile(save_folder,sprintf('results_data_%s.mat', scene_name ) ),'xhat_full_rgb','xhat_rgb','xhat_rgb_crop','xhat_adjust','depth_range','scene_name','masktype');
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4 generate_all_in_focus_rggb函數(shù) 生成全在焦圖
%清除變量和關(guān)閉所有打開的圖像界面
clear; close all;
%將當(dāng)前工作目錄添加到路徑中
addpath(genpath(pwd));
run('demo_block_diagonal');
% 定義圖像處理參數(shù)
fstack_params = [];
fstack_params.filtersize = 5; % 濾波器大小
fstack_params.logstd = 2 ; % 標準差
fstack_params.dilatesize = 13; % 膨脹大小
fstack_params.blendsize = 13; % 混合大小
fstack_params.blendstd = 5; % 混合標準差
fstack_params.logthreshold = 0; % 對數(shù)閾值
% 生成全焦深度圖像和深度信息
[image_rggb, depth_cone] = generate_all_in_focus_rggb(permute(xhat_rgb_crop,[4,3,1,2]) , fstack_params, depth_range, 0);
%% 顯示生成的全焦深度圖像和深度信息
subplot(121);
imshow(mat2gray(squeeze((permute(image_rggb,[1,3,4,2])))))
subplot(122);
imshow(depth_cone,[]);colormap parula
%%
[image_rggb, depth_cone] = generate_all_in_focus_rggb(permute(xhat_rgb,[1,4,2,3]) , fstack_params, depth_range, 0);
image_rggb = image_rggb(:,:,40:197,36:309);
depth_cone = depth_cone(40:197,36:309);
%
subplot(121);
imshow(mat2gray(squeeze((permute(image_rggb,[1,3,4,2])))))
subplot(122);
imshow(depth_cone,[]);colormap parula
%%
% % scene_name='ruler'
% % scene_name = 'toys'
% scene_name = 'two_cards'
%
% % -- MASKTYPE
% % masktype = 'random'
% masktype = 'opt'
% % masktype = 'scaleXY'
% % masktype = 'shiftXY'
%%% 定義保存結(jié)果的文件夾路徑
save_folder = fullfile('../progMask_results','1202_final_wiener');
if ~exist(save_folder,'dir')
mkdir(save_folder);
end
% 保存生成的全焦深度圖像
figure(1);
imshow(mat2gray(squeeze((permute(image_rggb,[1,3,4,2])))))
export_fig(fullfile(save_folder, sprintf('image_%s_%s',scene_name,masktype)));
% 保存生成的深度信息
figure(1);
imshow(depth_cone,[]);colormap parula
export_fig(fullfile(save_folder, sprintf('depth_%s_%s',scene_name,masktype)));
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