Unable to resolve the name cv.getOpti​malNewCame​raMatrix.

I do not solve this problem. I am trying to solve in many ways. Please anyone help me.

I find this problem:

Unable to resolve the name cv.getOptimalNewCameraMatrix.

Error in undistortion>undistorb_images (line 92)

[newcameramtx, roi] = cv.getOptimalNewCameraMatrix(camera_matrix, dist, [width,height], 0,

[width,height]);

Error in undistortion (line 1)

undistorb_images([], []);

undistorb_images([], []);

function [tvec, rvec, camera_matrix, dist] = read_wp2c(input_name)

%input_name = "output_wp2camera.json";

raw = fileread(input_name);

input_params = jsondecode(raw);

camera_matrix = input_params.camera_matrix;

dist = input_params.dist_coefs;

tvec_json = input_params.translational_vectors;

%tvec = struct2cell(tvec_json);

rvec_json = input_params.rotational_vectors;

%rvec = struct2cell(rvec_json);

tvec = [];

rvec = [];

len = length(tvec_json);

for i = 1:len

%tvec.append(array(tvec_json(image + string(i))))

%tvec.append.tvec_json(i);

tvec = struct2cell(tvec_json(i));

%[A{:}]

%tvec.append(input_params.translational_vectors.image0);

%rvec.append(array(rvec_json(image + string(i))));

rvec = struct2cell(rvec_json(i));

end

end

function undistorb_images(inputParams, result)

%if result is None:

if isempty(result)

input_name = "output_wp2camera.json";

[tvec, rvec, camera_matrix, dist] = read_wp2c(input_name);

else

tvec = result(4);

rvec = result(3);

camera_matrix = result(1);

dist = result(2);

end

if isempty(inputParams)

image_path = "images";

else

image_path = inputParams.opencv_storage.settings.Images_Folder;

end

%image_files = [];

files = [dir(fullfile(image_path,'*.jpg')); dir(fullfile(image_path,'*.png')); dir(fullfile(image_path,'*.jpeg')); dir(fullfile(image_path,'*.PNG'))];

%files = dir(fullfile(image_path, '*.(jpg|png)'));

L = length(files);

% kk=0;

% for i=1:L

% file=files(i).name;

% image_files = [image_files, file]

%

%

% end

%disp(image_files)

% for f = dir(image_path)

% %ext = image_path(split(lower(f)));

% %disp(f)

% %if f.endsWith([".jpg",".jpeg",".png", ".PNG"])

% % image_files.append(f);

% %end

% end

image_file_name = [];

if ~isempty(files)

for i=1:L

file=files(i).name;

image_file_name = [image_file_name,file];

%disp(image_file_name)

image = imread(image_path + "\" + file);

%disp(image);

% [imagePoints, boardSize] = detectCheckerboardPoints(image_file_name);

% squareSize = 29;

% worldPoints = generateCheckerboardPoints(boardSize, squareSize);

%

% I = readimage(image, 1);

% imageSize = [size(I,1), size(I,2)];

% [params, ~, estimationErrors] = estimateCameraParameters(imagePoinsts, worldPoints, 'ImageSize');

[height, width] = size(image);

%disp(string(height) + " " + string(width))

%[newCameraMatrix,w] = cv.getOptimalNewCameraMatrix(cameraMatrix, dist, [width,height]);

[newcameramtx, roi] = cv.getOptimalNewCameraMatrix(camera_matrix, dist, [width,height], 0, [width,height]);

%dst = cv2.undistort(image, camera_matrix, dist, None, newcameramtx)

% imageFileNames{i} = fullfile(matlabroot,'toolbox','vision','visiondata','calibration','webcam',image_file_name);

% [imagePoints,~,imagesUsed] = detectCheckerboardPoints(imageFileNames, 'PartialDetections', false);

% imageFileNames = imageFileNames(imagesUsed);

% for i = 1:numel(imageFileNames)

% I = imread(imageFileNames{i});

% subplot(2, 2, i);

% imshow(I);

% hold on;

% plot(imagePoints(:,1,i),imagePoints(:,2,i),'ro');

% end

[mapx, mapy] = cv.initUndistortRectifyMap(camera_matrix, dist, None, newcameramtx, [width,height], 5);

dst = cv.remap(image, mapx, mapy, INTER_LINEAR);

x, y, w, h = roi;

dst = dst(y:y+h, x:x+w);

[height, width] = size(dst);

print(string(height) + " " + string(width));

imwrite("undistortion/" + file, dst);

end

end

end

Answer 1

[prabhat kumar sharma]

Hello Md,

It looks like you’re encountering an issue with the cv.getOptimalNewCameraMatrix function in MATLAB. This error typically occurs when MATLAB cannot find the specified function, which might be due to a missing or incorrect path to the OpenCV library.

Here are a few steps you can take to resolve this issue:

1. Check OpenCV Installation: Ensure that OpenCV is correctly installed and that the MATLAB bindings for OpenCV are properly set up. You might need to install the mexopencv package if you haven’t already.
2. Add OpenCV to MATLAB Path: Make sure that the path to the OpenCV library is added to the MATLAB path. You can do this by using the addpath function in MATLAB:
3. Verify Function Availability: Confirm that the cv.getOptimalNewCameraMatrix function is available in your OpenCV installation. You can do this by checking the documentation or the list of functions in the OpenCV package.
4. Update OpenCV: If you are using an older version of OpenCV, consider updating to a newer version.There have been fixes and improvements in recent versions that might resolve your issue.
5. Exmaple Code Piece:

% Example usage of cv.getOptimalNewCameraMatrix
camera_matrix = [fx, 0, cx; 0, fy, cy; 0, 0, 1];
dist = [k1, k2, p1, p2, k3];
image_size = [width, height];
[newcameramtx, roi] = cv.getOptimalNewCameraMatrix(camera_matrix, dist, image_size, 0);

I hope it helps!