图像增强效果评估指标与Visual C++实践

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资源摘要信息:"图形图像处理_Visual C++" 图形图像处理是一门涉及图像的获取、处理和理解的学科,它在计算机科学、医学、生物信息学、遥感科学以及信息工程等领域中有着广泛的应用。图像增强处理是图像处理的一个重要分支,它包括对图像的亮度、对比度、色彩、清晰度等进行改善,以达到更加适合人眼观察或机器识别的目的。在处理完毕后,对图像增强效果的评价是一个关键步骤,这涉及一系列客观和主观的评价指标。 在Visual C++环境下进行图形图像处理,可以利用其强大的功能库和API接口,例如DirectShow、OpenCV等,实现复杂的图像处理算法。针对图像增强效果的评价,可以划分为以下几个重要的知识点: 1. 图像质量评价指标: - 客观指标:如峰值信噪比(PSNR)、结构相似性指数(SSIM)、信息熵、图像清晰度、对比度度量等。 - 主观指标:依赖于人的视觉感知,一般通过问卷调查、评分等方式来衡量图像增强效果的好坏。 2. 峰值信噪比(PSNR): PSNR是衡量图像质量的常用客观指标之一,通过计算原始图像和处理后图像的均方误差来得到。PSNR值越高,表示增强后的图像质量越好,与原始图像越接近。 3. 结构相似性指数(SSIM): SSIM是衡量图像结构信息保持情况的一个指标,它考虑到人眼对亮度、对比度和结构信息变化的敏感度。SSIM的取值范围通常在-1到1之间,接近1表示图像质量越好。 4. 图像清晰度评价: 清晰度是指图像边缘和细节的锐化程度。可以通过计算图像的拉普拉斯算子、梯度算子等得到,反映图像的细节保留情况。 5. 对比度度量: 对比度是图像中相邻像素亮度差异的度量。它影响图像的可视性与可理解性。可以通过直方图分布、方差或者对比度敏感函数来评价图像的对比度。 6. OpenCV在图像处理中的应用: OpenCV是一个开源的计算机视觉库,提供了丰富的图像处理函数,包括图像滤波、边缘检测、特征提取、图像变换等。利用OpenCV可以方便地实现上述图像质量评价指标的算法实现。 7. Visual C++编程基础: Visual C++是微软推出的集成开发环境(IDE),支持C++语言的开发。在Visual C++中,可以创建MFC(微软基础类库)应用程序,进行Windows应用程序的开发,其中包括图形图像处理的项目。 通过对上述知识点的学习和应用,可以完成图形图像处理项目中的图像增强及效果评价工作。在Visual C++环境下,结合OpenCV等图像处理库,可以开发出高效且功能强大的图像处理软件。评价图像增强效果时,应综合运用多种指标,从不同角度全面评估图像质量,以确保最终的处理结果既满足客观标准,又能符合用户的主观需求。

td_s32 ret; ot_vpss_grp_attr grp_attr = { 0 }; ot_vpss_chn_attr chn_attr[OT_VPSS_MAX_PHYS_CHN_NUM] = { 0 }; td_bool chn_enable[OT_VPSS_MAX_PHYS_CHN_NUM] = { 0 }; if (vpss_chn >= OT_VPSS_MAX_PHYS_CHN_NUM) { sample_print("vpss_chn:%d invalid!\n", vpss_chn); return TD_FAILURE; } grp_attr.nr_en = TD_TRUE; grp_attr.ie_en = TD_TRUE; grp_attr.dci_en = TD_TRUE; grp_attr.nr_attr.compress_mode = OT_COMPRESS_MODE_FRAME; grp_attr.dei_mode = OT_VPSS_DEI_MODE_OFF; grp_attr.pixel_format = SAMPLE_PIXEL_FORMAT; grp_attr.frame_rate.src_frame_rate = -1; grp_attr.frame_rate.dst_frame_rate = -1; grp_attr.max_width = size->width; grp_attr.max_height = size->height; chn_enable[vpss_chn] = TD_TRUE; chn_attr[vpss_chn].chn_mode = OT_VPSS_CHN_MODE_AUTO; chn_attr[vpss_chn].width = size->width; chn_attr[vpss_chn].height = size->height; chn_attr[vpss_chn].pixel_format = OT_PIXEL_FORMAT_YVU_SEMIPLANAR_420; chn_attr[vpss_chn].frame_rate.src_frame_rate = -1; chn_attr[vpss_chn].frame_rate.dst_frame_rate = -1; chn_attr[vpss_chn].border_en = TD_TRUE; chn_attr[vpss_chn].border_attr.color = COLOR_RGB_BLUE; chn_attr[vpss_chn].border_attr.top_width = 2; /* 2 : border top width */ chn_attr[vpss_chn].border_attr.bottom_width = 2; /* 2 : border bottom width */ chn_attr[vpss_chn].border_attr.left_width = 2; /* 2 : border left width */ chn_attr[vpss_chn].border_attr.right_width = 2; /* 2 : border right width */ ret = sample_common_vpss_start(vpss_grp, chn_enable, &grp_attr, chn_attr, OT_VPSS_MAX_PHYS_CHN_NUM); if (ret != TD_SUCCESS) { sample_print("failed with %#x!\n", ret); return TD_FAILURE; } return TD_SUCCESS;

2023-05-17 上传

根据下面代码写一篇答辩稿function varargout = image_enhancement_gui(varargin) gui_Singleton = 1; gui_State = struct('gui_Name', mfilename, ... 'gui_Singleton', gui_Singleton, ... 'gui_OpeningFcn', @image_enhancement_gui_OpeningFcn, ... 'gui_OutputFcn', @image_enhancement_gui_OutputFcn, ... 'gui_LayoutFcn', [] , ... 'gui_Callback', []); if nargin && ischar(varargin{1}) gui_State.gui_Callback = str2func(varargin{1}); end if nargout [varargout{1:nargout}] = gui_mainfcn(gui_State, varargin{:}); else gui_mainfcn(gui_State, varargin{:}); end function image_enhancement_gui_OpeningFcn(hObject, eventdata, handles, varargin) handles.output = hObject; guidata(hObject, handles); function varargout = image_enhancement_gui_OutputFcn(hObject, eventdata, handles) varargout{1} = handles.output; function open_btn_Callback(hObject, eventdata, handles) [filename, pathname] = uigetfile({'*.jpg;*.jpeg;*.png;*.bmp;*.tif;*.tiff', 'Image Files (*.jpg, *.jpeg, *.png, *.bmp, *.tif, *.tiff)'}, 'Select an image'); if isequal(filename, 0) || isequal(pathname, 0) return; end img = imread(fullfile(pathname, filename)); imshow(img, 'Parent', handles.axes1); handles.img = img; guidata(hObject, handles); function clahe_btn_Callback(hObject, eventdata, handles) img = handles.img; if isempty(img) warndlg('Please open an image first.', 'Warning'); return; end if size(img, 3) == 1 img_clahe = adapthisteq(img, 'ClipLimit', 0.02); else img_ycbcr = rgb2ycbcr(img); img_ycbcr(:,:,1) = adapthisteq(img_ycbcr(:,:,1), 'ClipLimit', 0.02); img_clahe = ycbcr2rgb(img_ycbcr); end imshow(img_clahe, 'Parent', handles.axes2); function close_btn_Callback(hObject, eventdata, handles) close(handles.figure1); function save_Callback(hObject, eventdata, handles) new_f_handle=figure('visible','off'); new_axes=copyobj(handles.axes2,new_f_handle); set(new_axes,'units','default','position','default'); [filename,pathname,fileindex]=uiputfile({'*.jpg';'*.bmp';'*.png'},'save picture as'); if ~filename return else file=strcat(pathname,filename); switch fileindex case 1 print(new_f_handle,'-djpeg',file); case 2 print(new_f_handle,'-dbmp',file); case 3 print(new_f_handle,'-dpng',file) end end delete(new_f_handle); function retinex_btn_Callback(hObject, eventdata, handles) if ~isfield(handles, 'img') msgbox('请先选择图像!', 'error'); return end im = handles.img; im_retinex = retinex(im); axes(handles.axes2); imshow(im_retinex); [pathname, filename, ext] = fileparts(s); imwrite(im_retinex, [pathname, filesep, 'retinex_', filename, ext]); handles.im_retinex = im_retinex; guidata(hObject, handles); function im_retinex = retinex(im) im_log = log(double(im) + 1); im_mean = mean2(im_log); im_retinex = exp(im_log - im_mean);

2023-05-29 上传

import os import cv2 import numpy as np from whale_optimization_algorithm import WhaleOptimizationAlgorithm # 定义图像增强函数 def image_enhancement(img): # 在此处添加对图像的增强操作 return img # 定义鲸鱼优化算法的适应度函数 def fitness_function(x): # 在此处添加对图像增强参数的处理和应用 # 返回适应度值 return 0 # 获取文件夹中所有图像的路径 def get_image_paths(folder_path): image_paths = [] for file_name in os.listdir(folder_path): if file_name.endswith('.jpg') or file_name.endswith('.png'): image_paths.append(os.path.join(folder_path, file_name)) return image_paths # 读取图像并进行增强 def enhance_images(image_paths): for image_path in image_paths: # 读取图像 img = cv2.imread(image_path) # 进行图像增强 enhanced_img = image_enhancement(img) # 保存增强后的图像到另一个文件夹中 new_image_path = image_path.replace('original', 'enhanced') cv2.imwrite(new_image_path, enhanced_img) # 使用鲸鱼优化算法对图像进行增强 def enhance_images_with_woa(image_paths): for image_path in image_paths: # 读取图像 img = cv2.imread(image_path) # 定义鲸鱼优化算法参数 woa = WhaleOptimizationAlgorithm(fitness_function, 10, 50, 100, 2, -2, 2) # 进行图像增强 enhanced_img = image_enhancement(img) # 保存增强后的图像到另一个文件夹中 new_image_path = image_path.replace('original', 'enhanced') cv2.imwrite(new_image_path, enhanced_img)在image_enhancement函数中添加适合的函数,在fitness_function中添加合适的函数

2023-06-11 上传

Defines the PatchGAN discriminator with the specified arguments. class NLayerDiscriminator(nn.Module): def init(self, input_nc=3, ndf=64, n_layers=3, norm_layer=nn.BatchNorm2d, use_sigmoid=False, use_parallel=True): super(NLayerDiscriminator, self).init() self.use_parallel = use_parallel if type(norm_layer) == functools.partial: use_bias = norm_layer.func == nn.InstanceNorm2d else: use_bias = norm_layer == nn.InstanceNorm2d self.conv1 = nn.Conv2d(input_nc, ndf, kernel_size=3, padding=1) self.conv_offset1 = nn.Conv2d(ndf, 18, kernel_size=3, stride=1, padding=1) init_offset1 = torch.Tensor(np.zeros([18, ndf, 3, 3])) self.conv_offset1.weight = torch.nn.Parameter(init_offset1) # 初始化为0 self.conv_mask1 = nn.Conv2d(ndf, 9, kernel_size=3, stride=1, padding=1) init_mask1 = torch.Tensor(np.zeros([9, ndf, 3, 3]) + np.array([0.5])) self.conv_mask1.weight = torch.nn.Parameter(init_mask1) # 初始化为0.5 kw = 4 padw = int(np.ceil((kw-1)/2)) nf_mult = 1 for n in range(1, n_layers): nf_mult_prev = nf_mult nf_mult = min(2n, 8) self.sequence2 = [ nn.Conv2d(ndf * nf_mult_prev, ndf * nf_mult, kernel_size=kw, stride=2, padding=padw, bias=use_bias), norm_layer(ndf * nf_mult), nn.LeakyReLU(0.2, True) ] nf_mult_prev = nf_mult nf_mult = min(2n_layers, 8) self.sequence2 += [ nn.Conv2d(ndf * nf_mult_prev, ndf * nf_mult, kernel_size=kw, stride=1, padding=padw, bias=use_bias), norm_layer(ndf * nf_mult), nn.LeakyReLU(0.2, True) ] self.sequence2 += [nn.Conv2d(ndf * nf_mult, 1, kernel_size=kw, stride=1, padding=padw)] if use_sigmoid: self.sequence2 += [nn.Sigmoid()] def forward(self, input): input = self.conv1(input) offset1 = self.conv_offset1(input) mask1 = torch.sigmoid(self.conv_mask1(input)) sequence1 = [ torchvision.ops.deform_conv2d(input=input, offset=offset1, weight=self.conv1.weight, mask=mask1, padding=(1, 1)) 上述代码中出现错误:RuntimeError: Expected weight_c.size(1) * n_weight_grps == input_c.size(1) to be true, but got false. (Could this error message be improved? If so, please report an enhancement request to PyTorch.),请问如何解决,给出修改后的代码

2023-05-30 上传