how can i Find a midline using two lines

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I have a code that is supposed to find the middle line in a track built from two lines when you can see this in the following pictures:

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yoram ifraimov 2022-5-2

test2.m

my matlab code:

% Initialization steps.

clc;

clearvars;

close all;

workspace;

fontSize = 16;

objects = imaqfind; %find video input objects in memory % מחפש את כל קלטי הוידאו שבזכרון

delete(objects) %delete a video input object from memory %מאפס את כל קלטי הוידאו

load('cameraParams1.mat')% נתונים מהקליברציה

focalLength = [cameraParams.FocalLength(1), cameraParams.FocalLength(2)]; % [fx, fy] in pixel units

principalPoint = [cameraParams.PrincipalPoint(1), cameraParams.PrincipalPoint(2)]; % [cx, cy] optical center in pixel coordinates

imageSize = cameraParams.ImageSize; % [nrows, mcols] 480x640

camIntrinsics = cameraIntrinsics(focalLength, principalPoint, imageSize); %מאחסן את הפרמטרים של המצלמה

height = 0.15; % mounting height in meters from the ground -גובה מיקום המצלמה

pitch = 30; % pitch of the camera in degrees -זווית המצלמה

yaw = 0; % yaw of the camera in degrees

roll = 0; % roll of the camera in degrees

sensor = monoCamera(camIntrinsics, height, 'Pitch', pitch,'Yaw',yaw,'Roll',roll); % חיישן המצלמה- גובה וזווית המצלמה

videoName = 'test3.mp4';

videoReader = VideoReader(videoName);

timeStamp = 0.06667; % time from the beginning of the video

videoReader.CurrentTime = timeStamp; % point to the chosen frame

frame = readFrame(videoReader); % read frame at timeStamp seconds

imshow(frame) % display frame

% Using vehicle coordinates, define area to transform

distAheadOfSensor = 1.; % in meters, as previously specified in monoCamera height input-

spaceToOneSide = 0.5; % all other distance quantities are also in meters-

bottomOffset = 0.15;

outView = [bottomOffset, distAheadOfSensor, -spaceToOneSide, spaceToOneSide]; % [xmin, xmax, ymin, ymax]

imageSize = [NaN, 1000]; % output image width in pixels; height is chosen automatically to preserve units per pixel ratio

birdsEyeConfig = birdsEyeView(sensor, outView, imageSize);

% birdsEyeImage = transformImage(birdsEyeConfig, frame);

% figure

% imshow(birdsEyeImage)

% % העברה מצבעוני לאפור

frame = rgb2gray(frame);

figure

imshow(frame)

% העברה לבינארי

frame(frame<170)=0;

figure

imshow(frame)

if ndims(frame) == 3

% It's color. Take the red channel.

grayImage = frame(:, :, 1);

end

figure

imshow(frame, []);

impixelinfo;

axis('on', 'image')

mask = logical(frame > 140 & frame < 255);

mask = bwareafilt(mask, 2); % Make sure we have only two lines.

mask = bwskel(mask);

figure

imshow(mask);

impixelinfo;

axis('on', 'image')

labeledImage = bwlabel(mask);

line1 = ismember(labeledImage, 1);

line2 = ismember(labeledImage, 2);

% Get rows and columns of each line.

[r1, c1] = find(line1);

[r2, c2] = find(line2);

for k = 1 : length(r1)

distances = sqrt(((r1(k) - r2) .^ 2) + ((c1(k) - c2) .^ 2));

[minDistance, index] = min(distances);

% Find the midPoint

midX(k) = mean([c1(k), c2(index)]);

midY(k) = mean([r1(k), r2(index)]);

% Burn into mask

mask(round(midY(k)), round(midX(k))) = true;

end

% Need to add a small amount of noise to x to make the values unique.

midX = midX + 0.001 * rand(size(midX));

midY = midY + 0.001 * rand(size(midY));

% Interpolate x and y to make sure there are no gaps.

kVec = 1 : length(midX);

kFit = linspace(1, kVec(end), 10000);

xFit = interp1(kVec, midX, kFit, 'linear');

yFit = interp1(kVec, midY, kFit, 'linear');

% Remove duplicate values

xy = unique(round([xFit(:), yFit(:)]), "rows");

% Extract individual x and y.

midX = xy(:, 1);

midY = xy(:, 2);

hold on;

plot(midX, midY, 'g.', 'MarkerSize', 10);

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Follow Question

Answer 1

yanqi liu 2022-5-7

0 个投票

yes，sir，which is the center line，is it like this？

may be check

https://ww2.mathworks.cn/matlabcentral/answers/1712640-how-to-create-centerline-between-to-lines-in-image#answer_958935

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yoram ifraimov 2022-5-15

thx

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Answer 2

Image Analyst 2022-5-15

0 个投票

I know for a fact that I solved this. Here it is:

https://www.mathworks.com/matlabcentral/answers/1710445-how-to-create-a-centerline-between-lines-in-image#answer_959650

Was this yours and @Dekel Mashiach's homework that I did for you? Otherwise why do two people have the very same image? Or are you and @Dekel Mashiach the same person, just with two different accounts.

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