关联灰度-深度稀疏表达学习与图像深度恢复的提升

需积分: 9 4 下载量 24 浏览量 更新于2024-07-23 收藏 4.28MB PDF 举报
"《Learning Joint Intensity-Depth Sparse Representations》是一篇发表在2014年IEEE Transactions on Image Processing的论文,主要探讨了如何通过结合图像灰度和深度信息来学习稀疏表示。文章提出了一种创新方法,旨在构建一种过完备字典,其中包含两种类型的原子:一是描述图像灰度信息,二是描述场景深度。这种方法的核心是开发了一个新的联合基追踪算法(Joint Basis Pursuit, JBP),它利用锥规划技术寻找灰度和深度数据中的相关稀疏特征。 传统的图像处理模型往往专注于单一形式的数据(如灰度或深度),但这种方法忽视了它们之间的内在联系。作者认为,由于灰度和深度是由同一3D场景产生的不同表现,它们之间存在着相关性,这种相关性可以用于提高数据处理的精度和鲁棒性,比如去噪、深度信息修复等。 JBP算法的独特之处在于,它对灰度和深度分别采用不同的原子和系数,构建关联稀疏模型,这与传统的组套索(Group Lasso)等方法有所不同。论文给出了一个关联基追踪算法下稀疏系数恢复误差的界限分析,并通过实验对比表明,JBP在恢复生成模型时具有优势,特别是在处理混合图像深度传感器(如Microsoft Kinect)提供的数据时,其性能优于现有技术。 该研究的实验部分分为两部分:模型恢复和灰度-深度字典学习。在模型恢复部分,算法能够有效地从含有噪声或缺失信息的深度图中恢复出高质量的图像,而在字典学习阶段,算法能够学习到一组关联特征,如深度-灰度边界和纹理-深度倾斜,这些特征有助于提升深度图像的准确性和完整性。 这篇文章为图像处理领域提供了一种新的视角,即通过同时考虑灰度和深度数据的关联性,实现更有效的稀疏表示学习,从而在诸如3D场景重建和视觉应用中提高了数据处理的性能。"

if name == "main": parser = argparse.ArgumentParser(description="Intensity Normalizer") parser.add_argument("-s", "--src", type=str, help="source directory.") parser.add_argument("-d", "--dst", type=str, help="destination directory.") parser.add_argument( "--mm_resolution", type=float, default=0.0, help="spatial resolution [mm].", ) parser.add_argument( "--depth", type=int, default=-1, help="depth of the maximum level to be explored. Defaults to unlimited.", ) args = parser.parse_args() if args.src is None: parser.print_help() exit(0) root_src_dir: Path = Path(args.src).resolve() if not root_src_dir.is_dir(): logger.error("Indicate valid virectory path.") exit() root_dst_dir = Path( args.dst or str(root_src_dir) + "_intensity_normalized" ) mm_resolution = float(args.mm_resolution) depth = int(args.depth) volume_loading_queue = Queue() volume_loading_process = Process( target=volume_loading_func, args=(root_src_dir, root_dst_dir, depth, volume_loading_queue, logger), ) volume_loading_process.start() volume_saving_queue = Queue() volume_saving_process = Process( target=volume_saving_func, args=(volume_saving_queue, logger), ) volume_saving_process.start() while True: ( volume_path, np_volume, volume_info, ) = volume_loading_queue.get() if volume_path is None: break relative_path = volume_path.relative_to(root_src_dir) np_volume = normalize_intensity(np_volume, relative_path, logger) if mm_resolution != 0: volume_info.update({"mm_resolution": mm_resolution}) while volume_saving_queue.qsize() == 1: pass dst_path = Path( root_dst_dir, re.sub(r"cb\d{3}$", "", str(relative_path)) ) volume_saving_queue.put( (dst_path, root_dst_dir, np_volume, volume_info) ) volume_saving_queue.put((None, None, None, None))请完整详细的解释每一行的代码意思

2023-04-19 上传

将下面这段代码改用python写出来: clear all; close all; fdir = '../dataset/iso/saii/'; %Reconstruction parameters depth_start = 710; depth_end = 720; depth_step = 1; pitch = 12; sensor_sizex = 24; focal_length = 8; lens_x = 4; lens_y = 4; %% import elemental image infile=[fdir '11.bmp']; outfile=[fdir, 'EIRC/']; mkdir(outfile); original_ei=uint8(imread(infile)); [v,h,d]=size(original_ei); %eny = v/lens_y; enx = h/lens_x; % Calculate real focal length %f_ratio=36/sensor_sizex; sensor_sizey = sensor_sizex * (v/h); %focal_length = focal_length*f_ratio; EI = zeros(v, h, d, lens_x * lens_y,'uint8'); for y = 1:lens_y for x = 1:lens_x temp=imread([fdir num2str(y),num2str(x),'.bmp']); EI(:, :, :, x + (y-1) * lens_y) = temp; end end %Reconstruction [EIy, EIx, Color] = size(EI(:,:,:,1)); %% EI_VCR time=[]; for Zr = depth_start:depth_step:depth_end tic; Shx = 8*round((EIx*pitch*focal_length)/(sensor_sizex*Zr)); Shy = 8*round((EIy*pitch*focal_length)/(sensor_sizey*Zr)); Img = (double(zeros(EIy+(lens_y-1)*Shy,EIx+(lens_x-1)*Shx, Color))); Intensity = (uint16(zeros(EIy+(lens_y-1)*Shy,EIx+(lens_x-1)*Shx, Color))); for y=1:lens_y for x=1:lens_x Img((y-1)*Shy+1:(y-1)*Shy+EIy,(x-1)*Shx+1:(x-1)*Shx+EIx,:) = Img((y-1)*Shy+1:(y-1)*Shy+EIy,(x-1)*Shx+1:(x-1)*Shx+EIx,:) + im2double(EI(:,:,:,x+(y-1)*lens_y)); Intensity((y-1)*Shy+1:(y-1)*Shy+EIy,(x-1)*Shx+1:(x-1)*Shx+EIx,:) = Intensity((y-1)*Shy+1:(y-1)*Shy+EIy,(x-1)*Shx+1:(x-1)*Shx+EIx,:) + uint16(ones(EIy,EIx,Color)); end end elapse=toc time=[time elapse]; display(['--------------- Z = ', num2str(Zr), ' is processed ---------------']); Fname = sprintf('EIRC/%dmm.png',Zr); imwrite(Img./double(Intensity), [fdir Fname]); end csvwrite([fdir 'EIRC/time.csv'],time);

2023-07-11 上传