1
我用攝像機標定在MATLAB中檢測到一些棋盤圖案,之後轉型攝像機標定模式
figure; showExtrinsics(cameraParams, 'CameraCentric');
現在,我想繞X軸,使得棋盤圖案它們在相機框架中具有幾乎相同的y座標。
方法: 我得到相機框架中所有圖案的位置。然後我做優化,其中目標函數是最小化y方差,變量是圍繞x範圍從0到360的旋轉。
問題: 但是當我繪製轉換後的y座標時,它們甚至幾乎處於一條線。
代碼:
獲取checkerboad點:
%% Get rotation and translation matrices for each image;
T_cw=cell(num_imgs,1); % stores camera to world rotation and translation for each image
pixel_coordinates=zeros(num_imgs,2); % stores the pixel coordinates of each checkerboard origin
for ii=1:num_imgs,
% Calibrate the camera
im=imread(list_imgs_path{ii});
[imagePoints, boardSize] = detectCheckerboardPoints(im);
[r_wc, t_wc] = extrinsics(imagePoints, worldPoints, cameraParams);
T_wc=[r_wc,t_wc';0 0 0 1];
% World to camera matrix
T_cw{ii} = inv(T_wc);
t_cw{ii}=T_cw{ii}(1:3,4); % x,y,z coordinates in camera's frame
end
數據(num_imgs = 10):
t_cw
[-1072.01388542262;1312.20387622761;-1853.34408157349]
[-1052.07856598756;1269.03455126794;-1826.73576892251]
[-1091.85978641218;1351.08261414473;-1668.88197803184]
[-1337.56358084648;1373.78548638383;-1396.87603554914]
[-1555.19509876309;1261.60428874489;-1174.63047408086]
[-1592.39596647158;1066.82210015055;-1165.34417772659]
[-1523.84307918660;963.781819272748;-1207.27444716506]
[-1614.00792252030;893.962075837621;-1114.73528985018]
[-1781.83112607964;708.973204727939;-797.185326205240]
[-1781.83112607964;708.973204727939;-797.185326205240]
主代碼(優化和轉換):
%% Get theta for rotation
f_obj = @(x)var_ycors(x,t_cw);
opt_theta = fminbnd(f_obj,0,360);
%% Plotting (rotate ycor and check to fix theta)
y_rotated=zeros(1,num_imgs);
for ii=1:num_imgs,
y_rotated(ii)=rotate_cor(opt_theta,t_cw{ii});
end
plot(1:numel(y_rotated),y_rotated);
function var_computed=var_ycors(theta,t_cw)
ycor=zeros(1,numel(t_cw));
for ii =1:numel(t_cw),
ycor(ii)=rotate_cor(theta,t_cw{ii});
end
var_computed=var(ycor);
end
function ycor=rotate_cor(theta,mat)
r_x=[1 0 0; 0 cosd(theta) -sind(theta); 0 sind(theta) cosd(theta)];
rotate_mat=mat'*r_x;
ycor=rotate_mat(2);
end
考慮接受答案,如果它幫助你 –