How to solve (Incorrect use of '=' operator. To assign a value to a variable, use '='. To compare values for equality, use '==')

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Haseeb Hassan
Haseeb Hassan 2019-10-10
评论： Walter Roberson 2020-4-29
%-----------------------------------
% A 3D TV Approach Using Depth Image Based Rendering (DIBR)
% Christoph Fehn
%
% A Survey: Fast & Approximate Algorithm of Depth Image Based Rendering
% Process for Application of 2D to 3D Conversation
% Neetesh Nema, Bragesh Patel
%
% Approximate Processing of DIBR Process for 2D to 3D Conversion of Images
% Sanjeev Jaiswal, Jigyasha Soni
%
%
%function [V_v] = DIBR(V_o, D_o, K_o, Rt_o, K_v, Rt_v)
clear all; close all; clc
V_o = imread('V_original.png'); % 2D original image, contains color also known as texture information
% imfinfo ('V_original.png')
D_o = imread('D_original.png'); % corresponding depth map contains normalize depth information
% imfinfo ('D_original.png')
%% Original camera parameters
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% Intrinsic parameters of original camera
K_o = [1732.87 0.0 943.23; 0.0 1729.90 548.845040; 0 0 1]; %camera calibrartion matrix
% Extrinsic parameters of original camera
Rt_o = [1.0 0.0 0.0 0; 0.0 1.0 0.0 0.0; 0.0 0.0 1.0 0.0]; % rotation and translation matrix
% depth map normalization factors
% Znear and Zfar are nearest and fartheset points in the scene from the original camera
Zfar = 2760.510889;
Znear = 34.506386;
%% Virtual camera parameters
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% Intrinsic parameters of virtual camera
K_v = [1732.87 0.0 943.23 ;0.0 1729.90 548.845040; 0 0 1];
% Extrinsic parameters of virtual camera
Rt_v = [1.0 0.0 0.0 1.5924; 0.0 1.0 0.0 0.0; 0.0 0.0 1.0 0.0]; % rotation and translation matrix
%% Task 1: produce a synthesized 2D virtual image located at the positioned defined by the two cameras' projection matrices
%% 3D image wrapping
%rgb to ycbcr
% V_o_ycbcr = rgb2ycbcr(V_o); %color space transformation
% D_o_ycbcr = rgb2ycbcr(D_o);
% figure;
% lb={'Y','Cb','Cr'};
% for channel=1:3
% subplot(1,3,channel)
% V_o_ycbcr_C=V_o_ycbcr;
% V_o_ycbcr_C(:,:,setdiff(1:3,channel))=intmax(class(V_o_ycbcr_C))/2;
% imshow(ycbcr2rgb(V_o_ycbcr_C))
% title([lb{channel} ' component'],'FontSize',18);
% end
% figure;
% subplot(1,3,1)
% imshow(V_o_ycbcr(:,:,1))
% title('Y component','FontSize',18);
% subplot(1,3,2)
% imshow(V_o_ycbcr(:,:,2))
% title('Cb component','FontSize',18);
% subplot(1,3,3)
% imshow(V_o_ycbcr(:,:,3))
% title('Cr component','FontSize',18);
% figure;
% lb={'Y','Cb','Cr'};
% for channel=1:3
% subplot(1,3,channel)
% D_o_ycbcr_C=D_o_ycbcr;
% D_o_ycbcr_C(:,:,setdiff(1:3,channel))=intmax(class(D_o_ycbcr_C))/2;
% imshow(ycbcr2rgb(D_o_ycbcr_C))
% title([lb{channel} ' component'],'FontSize',18);
% end
im1 = rgb2gray(V_o);
im2 = rgb2gray(D_o);
% frame_size = size(im1);
% allpixels = reshape(im1, frame_size);
% frame2 = reshape(allpixels, frame_size);
[H1,W1, ~] = size(im1);
[x1, y1] = meshgrid(1:W1,1:H1);
[H,W, ~] = size(im2);
[x, y] = meshgrid(1:W,1:H);
% m = K_o * eye(3,4) *
% m1 = K_o * eye(3)*im1;
fx_d = fy_d =1; % assume f = 1, currently unknown
x_k = (- im2./fx_d).*(x1-x);
y_k = (- im2./fy_d).*(y1-y);
XwYwZw = cat(3, x_k,y_k,im2);
%% 2D to 3D transform
XwYwZw = reshape(XwYwZw, H*W, 3);
XwYwZw1 = [XwYwZw ones(H*W,1)];
%% rotate and translate the 3D points
XcYcZc1 = [Rt_o Rt_o(:,4); 0 0 0 1]*XwYwZw1';
%% rotate and translate the 3D points
XcYcZc1 = [Rt_v Rt_v(:,4); 0 0 0 1]*XwYwZw1';
%% part 3 project into image coordinates
%XcYcZc1 = XcYcZc1';
Xc = reshape(XcYcZc1(1,:),H,W); % take Xc and Yc from camera coordinates
Yc = reshape(XcYcZc1(2,:),H,W);
Zc = XcYcZc1(3,:);
Ix = ((x1 .*Xc) ./ im2);
Iy = ((y1 .*Yc) ./ im2);
Dx = Ix+im1;
Dy = Iy+im1;
% m = [x1,y1] + ((eye(3,3)*(Rt_v(:,4)))./2760.510889)+

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采纳的回答

Walter Roberson
Walter Roberson 2019-10-10
fx_d = fy_d =1; % assume f = 1, currently unknown
MATLAB does not have "transitive" assignment to set multiple variables to the same value. You will need to use individual assignments (or ugly constructs.)
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apri zulham
apri zulham 2020-4-29
编辑：apri zulham 2020-4-29
i have a problem
Error: File: servogui.m Line: 128 Column: 5
Incorrect use of '=' operator. To assign a value to a
variable, use '='. To compare values for equality, use
'=='.
global k;
x=0;
if k=1:1:handles.xSample
b=readAnalog(3);
x=[x,b];
plot(x,'LineWidth',2);
grip on;
axis([0 handles.xSample 0 500]);
pause(0.01);
end
Walter Roberson
Walter Roberson 2020-4-29
Are you trying to make a single comparison? If so then you would use == -- but notice that the right hand side of the = is a vector so there is no chance that the test can succeed unless k is a vector the same size (and even that is unlikely to work)
The form of your code is as if you are expecting to loop. Loops use for not if

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