7w次，点赞37次，收藏230次。这篇博客介绍了如何在MATLAB中创建一个自定义的点选取工具my_ginput ()，以优化图片上的点标注过程。作者通过调整ginput ()的默认设置，解决了十字光标过大和线条过黑的问题，使得在黑色背景图片上也能清晰地进行点选取。此外，博客还展示了如何在图像上 I cannot seem to get my image to display the coordinates of my mouse cursor, and also use ginput to store points at the same time. Nov 6, 2025 · MATLAB combines a desktop environment tuned for iterative analysis and design processes with a programming language that expresses matrix and array mathematics directly. So basically, I have an image and two buttons, the first one is to rotate the image (taking 2 coordinates with ginput(2)) and Jul 14, 2021 · Hi, I wondered if anyone knows a function or method used to read the pixel values in an image. 8309, which proves that the resolution of the axes is different for each direction. Jul 25, 2011 · Hi Community, I was wondering if it were possible to be able to know where one clicked on an image while using ginput(n), i. getting RGB from webcam value. Oct 2, 2009 · I want to zoom in on an image using the ZOOM function. png looks), you would be better off saving it as a vector image and then you have two options: Apr 23, 2015 · I have an image and i want to cut a small region of the image using ginput. Use MATLAB and Simulink to analyze data for homework, conduct research, and develop programming skills that prepare you for your future career. In the fourth stage the relationship between the coordinates of the two corners on the figure window and the reference coordinate system is then used to compute the transformation for all of the digitized points. In the particular version that I have, ginput has its crosshair code mainly in two functions: Mar 30, 2016 · 文章浏览阅读4. Dec 1, 2017 · You need to modify the built-in ginput () function since they forgot to add this incredibly obvious and needed option of color. [x,y] = ginput (n) enables you to select n points from the current axes and returns the x - and y -coordinates in the column vectors x and y, respectively. 7200 77. Learn more about appdesigner, matlab gui, image Image Processing Toolbox Aug 27, 2016 · I've got an image with pixels that are 0. r. I am trying to select an unlimited number of points from an image ([x,y] = ginput), and each time I select a point I want to plot it, so I can have a real time reference of each point I get. I h Jun 13, 2020 · Hi, Is there a way in the code below to mark and show selected points on the graph instantly while selecting them? (48 -52 code lines) clear all; close all; % Select the figure you want to di Jan 18, 2013 · Jiro wrote a new function based on MATLAB's ginput that makes the color and thickness of the cursor fully customizable. g. Learn more about appdesigner, matlab gui, image Image Processing Toolbox MATLAB is a computing platform that is used for engineering and scientific applications like data analysis, signal and image processing, control systems, wireless communications, and robotics. When the image is zoomed in at the de Apr 10, 2017 · I am attaching a sample GUI codes, which has two axes with 2 images and when I use ginput to select seed point I am able to select on either axes, Is there anyway to limit the ginput to a specific Work with standard image file formats in MATLAB, such as reading and writing image files. - corysakti/colorPickerMatlabTest Apr 4, 2018 · I was working on a Matlab GUI with GUIDE and used the ginput function to select several points on the predefined axes and it worked perfectly. having a red dot over the area where I clicked so that I later am a Aug 4, 2023 · This GINPUT-style point selection is also continuous, meaning user won’t need to activate it with any GUI component, but of course its start and stop is controllable. However, instead getting for example an x y values [40 80] I'm getting [40. Also, x and y represents horizontal and vertical by default. The Figure must have focus before ginput receives input. When the image is zoomed in at the de I am trying to select an unlimited number of points from an image ([x,y] = ginput), and each time I select a point I want to plot it, so I can have a real time reference of each point I get. How can I use the GINPUT function to select a point on an image in MATLAB along with the ZOOM function? I want to zoom in on an image using the ZOOM function. How to use MATLAB's ginput on an image imported by imshow Tolga Kaya 30 subscribers Subscribed Feb 18, 2022 · How to display images using the ginput function ?. Jun 6, 2023 · The third stage uses ginput to define the upper left and lower right corners of the image. For some reason it's returning non integer values which is impos Apr 24, 2018 · 1 I am using Matlab R2015b and I do not know if ginput has been modified since then. All the code shown works perfectly in Octave as well. It is widely used by engineers, scientists and researchers for solving mathematical problems, analyzing data, developing algorithms and creating models. If the graph only exists on paper, it rst needs to be scanned in a graphical format Matlab understands, e. Here is what I mean. 12 80. Sep 16, 2015 · 我使用MATLAB中的ginput函数来使用光标收集图像上的多个x，y坐标。 我沿着图像遵循一定的路径，需要放大以获得精确的坐标，但是在使用ginput时禁用了缩放选项。 对如何绕过这个问题有什么想法吗？ 下面是我使用的非常简单的代码。 Dear all, I tried ginput for image segmentation, but I obviously don´t know how to use it. Nov 15, 2016 · Hi. Zooming and panning can be done between between Add Point calls. Why this is happening? any lead? Anyway when using the weird X Y coordinates with the command impixel I get pixel values, however How can I know if I'm getting the value of the pixel I really want??. Sep 2, 2020 · ginput (1) asks the user to click on one point and it returns the x and y value of that point. having a red dot over the area where I clicked so that I later am a The output from the routine is an N 2 array of data points (xi; yi)N i=1 given in the graph coordinate system. The figure must have focus before ginput receives input. This video is part of a series compri This MATLAB function allows you to identify the coordinates of n points within Cartesian, polar, or geographic axes. Learn more about appdesigner, matlab gui, image Image Processing Toolbox Apr 30, 2018 · Allow user to read in an image, then using ginput function, the user can draw a line, anydirection. Learn more about video ginput Image Processing Toolbox Dec 5, 2023 · 文章浏览阅读4. How to display images using the ginput function ?. Ineed to store 2 point clicks in 2 variables which was given as user input in an image through ginput (2). My result is only figure with axes and curve. Discover dynamic system modeling, model hierarchy, and component reusability in this comprehensive introduction to Simulink. Oct 2, 2009 · How can I use the GINPUT function to select a point on an image in MATLAB along with the ZOOM function? I want to zoom in on an image using the ZOOM function. Here we use the end points of the major axis in the denser (red) region and average over them. I used 'islocalmin' to identify heel strikes, but it is identifying some Mar 9, 2019 · Hi So i have a 'ginput' command that produces a spectrum of a spot in an image. However, when I use the function in the same way in the Maltab App Designer I encounter the described problem. I want to find coordinates of the points automatically without using 'ginput'. I would like to interrupt (return) the script if the user closes the figure. 0104 y1 = 65. Matplotlib是Python中的一个库，它是数字的-NumPy库的数学扩展。 Pyplot是Matplotlib模块的基于状态的接口，该模块提供了MATLAB-like接口。在Pyplot中可以使用各种图，例如线图，轮廓图，直方图，散点图，3D图等。 Jun 15, 2020 · This clearly demonstrates that there is a bias with ginput () and the 'CurrentPoint' property in the x-direction. I've got an image with pixels that are 0. [x,y] = ginput(n) enables you to select n points from the current Axes and returns the x - and y -coordinates in the column vectors x and y, respectively. Mar 20, 2013 · I'd like to be able to simply mark a point on an image using a crosshair or something similar. In the particular version that I have, ginput has its crosshair code mainly in two functions: Oct 25, 2019 · I plot a line with experimental data (x,y). Learn more about appdesigner, matlab gui, image Image Processing Toolbox Apr 7, 2016 · If, by any chance, you got this image from a PDF file, where it appears as a vector image (you can test this by zooming in as much as you like without the chart becoming pixelated; this seems to be your case from the way the . the bmp, jpg or png formats (See the Matlab documentation for a survey of other available formats). I got a rectangle using the following code. Download and install MATLAB, Simulink, and accompanying toolboxes and blocksets on a personal computer. This argument is optional in most contexts, but when you call these functions in App Designer, you must specify this argument. I have a gray-level image, and I can use the ginput function to select the co Feb 18, 2022 · How to display images using the ginput function ?. 4430 78. Sep 17, 2025 · MATLAB ( MATrix LABoratory) is a programming and numeric computing platform developed by MathWorks. Learn more about appdesigner, matlab gui, image Image Processing Toolbox Jun 19, 2020 · Use ginput to crop an image. 07]. Log in to use MATLAB online in your browser or download MATLAB on your computer. With the image of the graph available, the rst step then consists of getting Oct 2, 2009 · How can I use the GINPUT function to select a point on an image in MATLAB along with the ZOOM function? I want to zoom in on an image using the ZOOM function. Aug 21, 2014 · Today I used ginput over my image to get the x y coordinates. I currently am trying the following: ginput enables you to select points from the figure using the mouse or arrow keys for cursor positioning. The user can select points on a plot with the ginput function or select the position at which to place text on the plot with the gtext function using the mouse. and i would like to get [x, y] into a matrix 30x6 (30 points and 6 images) i have tryed making a for-loop and a function like xx=x (k) but i make it work. Then you take the x value and stick in into strt (i). May 13, 2025 · Use this quick guide to learn what MATLAB is used for, pros and cons, and how you can get started. bmp image I have displayed using imshow(). I am aware of this issue is related to Image Coordinate System setting, but I am still not sure how to convert x and y obtained from ginput function to the actual pixel indices? Thanks. Find project ideas, courseware, and tools to enhance your curriculum. Learn core MATLAB functionality for data analysis, modeling, and programming. We now type ginput to find the coordinates of the rings: imagesc (im1) [x1, y1] = ginput (2) x1 = 49. horizontal. I am analyzing heel strike data when walking. Jun 27, 2009 · I want to read the (x, y) position of the mouse continuously as the mouse moves around the figure, without the need for me to explicitly click at a particular position to use the GINPUT or an equiv Aug 27, 2016 · I've got an image with pixels that are 0. With the roipoly is easy to do it, but doing to a square or a circle I dont know how to do it. 3k次，点赞5次，收藏15次。本文介绍了MATLAB中的ginput函数，该函数允许用户通过鼠标或光标在图形界面上选择点并获取其坐标。文章详细解释了不同语法形式的用法，并提供了一个简单的示例来演示如何使用ginput函数。 This MATLAB function creates an interactive Crop Image tool to crop the grayscale, truecolor, or binary image displayed in the current figure. 1 units in x and 0,1 units in y. Apr 4, 2018 · I was working on a Matlab GUI with GUIDE and used the ginput function to select several points on the predefined axes and it worked perfectly. e. I want to have a user select some number 'n' points on that image and assign the x,y coordinates of those selections to a variable. MATLAB allows matrix manipulations, plotting of functions and data, implementation of algorithms, creation of user interfaces, and interfacing with programs written in other languages. I have a gray-level image, and I can use the ginput function to select the co Interactive functions # This provides examples of uses of interactive functions, such as ginput, waitforbuttonpress and manual clabel placement. having a red dot over the area where I clicked so that I later am a Feb 18, 2022 · How to display images using the ginput function ?. Then you repeat that and put the next x value where the user clicks and put it into fin (i). I have a matrix of 4 images (2x2) and I want to use ginput to select an image and with that selection, determine which image it is. Ideally, one would be able Dec 7, 2014 · I have two corner points (I marked them in red so you can see it) in black and white image. This video covers the ginput, text, and gtext commands in Matlab. Dec 12, 2013 · I'm doing a little interface on matlab right now and I have a problem. This becomes very helpful when you need to read coordinates of image pixels and zoom in/out as well. Getting correspondences [10 points]: First write code to get manually identified corresponding points from two views. The results will be sensitive to the accuracy of the corresponding points; when providing clicks, choose distinctive points in the image that appear in both views. Right now I did h=fig Aug 26, 2016 · I've got an image with pixels that are 0. Look at Matlab’s ginput function for an easy way to collect mouse click positions. When the image is zoomed in at the de Display Graphics in App Designer App Designer Graphics Overview Many of the graphics functions in MATLAB ® (and MATLAB toolboxes) have an argument for specifying the target axes or parent object. Apr 5, 2015 · [x,y] = ginput(1); % getting coordinates from user To obtain the pixel value, we need to pass the coordinates as indices of the image. I h Jun 27, 2018 · It seems to suggest that the 4 points I marked using ginput are outside the image (but actually it is not). Feb 18, 2022 · How to display images using the ginput function ?. project matlab colorpicker from webcam. You can connect to cloud storage solutions and collaborate on projects through a web browser without installing software. Nov 1, 2022 · Also on a side, is there example code or discussion for finding the location of this image on google maps using Matlab? Like I want to cross reference the location of ash or background (if that makes sense). [x, y, buttons] = ginput (n) ¶ [x, y, buttons] = ginput () ¶ Return the position and type of mouse button clicks and/or key strokes in the current figure window. How can i do this step. When the image is zoomed in at the desired level, I wish to use the GINPUT function to pickup and process a point. How can I do it? Extracting data from a graph image using 'ginput' Suivre 3 vues (au cours des 30 derniers jours) Afficher commentaires plus anciens Apr 4, 2018 · I was working on a Matlab GUI with GUIDE and used the ginput function to select several points on the predefined axes and it worked perfectly. On the other hand, the y-direction seems to be OK, despite the values seeming to be now multiples of 5. Feb 24, 2014 · How to get onclick coordinate pixel value and location from an image? Actually I want to get some location (x,y) and corresponding pixel value after clicking on image. 3728 Dec 12, 2018 · I trying to create a workaround to the lack of ginput functionality in the new App Designer UIFigure. Is it possible? How can be done? How can I use the GINPUT function to select a point on an image in MATLAB along with the ZOOM function? I want to zoom in on an image using the ZOOM function. MATLAB Online extends the capabilities of MATLAB and Simulink to the cloud. In the middle of my script I ask the user to zoom a figure and call ginput afterwards. What I'm trying to achieve is, using ginput i'll have to click those two dots and I need it to calculate the distance between them. Based on this line create a perfect box. Control points define the axis end points, while points can be added using the "Add Points" button. And I don't think that I can do it with the function ginput. This need to be done interactively for a large Mar 1, 2011 · I want to add two lines on top of a specific image using GINPUT. PointPicker MATLAB Tool to get points from image plot Simple GUI tool to assist in pulling data from an image plot. For example see my attached code where I changed the [0,0,0] to [1,1,1] (white). Please help in this step. This MATLAB function allows you to identify the coordinates of n points within Cartesian, polar, or geographic axes. I am trying to use ginput to return the indices of the a pixel I click on from within an . The idea is to do the following: Use the CurrentPoint callback to register the pixel location I want to select a square or a circle in an image and then apply a filter on it, and then, show the image with the circle or square which I selected with the filter applied on it. It's not a plot I'm using, I want to be able to overlay the marker on the actual image at a particular Aug 13, 2023 · 文章浏览阅读8. I attach printscreen of my result and the result of how i Jun 30, 2011 · I would like to create a function in Matlab that, given an image, will allow one to select a pixel by clicking on it in the image and return the coordinates of the pixel. I currently am trying the following: Feb 2, 2017 · The image is after reducing noise and you can see two black dots in that image. 8w次，点赞11次，收藏67次。本文介绍了Matlab中的ginput ()与getpts ()两个函数的使用方法，这两个函数允许用户通过鼠标在图像上选择点并获取这些点的坐标值。ginput ()函数能够返回指定数量或无限数量的点坐标，而getpts ()则专门用于获取图像中的多个点坐标。 How to display images using the ginput function ?. Jul 14, 2021 · Hi, I wondered if anyone knows a function or method used to read the pixel values in an image. When the image is zoomed in at the de Work with standard image file formats in MATLAB, such as reading and writing image files. To do this, the output arguments from the ginput which are double by default, must be converted to unsigned integers. Learn more about appdesigner, matlab gui, image Image Processing Toolbox 我正在使用MATLAB中的ginput函数在图像上使用光标收集许多x，y坐标。我按照图像上的某个路径进行操作，并需要缩放以获取精确的坐标，但是在使用ginput时缩放选项被禁用了。有什么办法可以解决这Zooming in/out while using ginput function in MATLAB Dec 21, 2022 · implay a video and draw n points with ginput. Here’s the same image, but this time with Jiro's ginputc function: ginput enables you to select points from the figure using the mouse or arrow keys for cursor positioning. An overlaid plot showing the picked points is provided after each This MATLAB function allows you to identify the coordinates of n points within Cartesian, polar, or geographic axes. I have tried to use "ginput" to do this, but there is one issue. For example, if I click on (3000,2000) I want the program to tell me it is the orange flower image. how to cut the image in this area? [x1 y1]=ginput(2); [x2 y2]=ginput(2); [x3 Jul 25, 2011 · Hi Community, I was wondering if it were possible to be able to know where one clicked on an image while using ginput(n), i. how can I do this???????? Nov 1, 2022 · Image Processing using ginput for Grain Size Learn more about image analysis, image processing, image segmentation, spatial calibration Image Processing Toolbox, Image Acquisition Toolbox Jun 27, 2013 · Dear Image Analyst, I need to draw a line between two points in an image during execution of the program and measure the angle w. Sep 19, 2014 · This code lets you zoom in/out when you use ginput and you need to use imshow to keep the aspect ratio of image fixed. t. ask the user for box "left" or "right" from input line. There is no index since it's just one points. Jul 12, 2023 · I need to use 'ginput' to select points from a plot to receive x and y values. how can I do this???????? Apr 24, 2018 · 1 I am using Matlab R2015b and I do not know if ginput has been modified since then. Finding the difference in coordinates You must be careful when choosing the reference points. Learn more about binary, ginput, crop, image, imshow Apr 18, 2013 · Hi I am a learner of Matlab. Then I want to pick, with ginput, EXACTLY, some of the data on the graph. Can someone help me do that since it would save me a lot of time for my analysis. How do i plot all the points I select in the same graph, so that i can compare multiple spectra readily, please? Th We would like to show you a description here but the site won’t allow us. Jun 3, 2018 · Getting points with ginput from image and plotting simultaneously each selected point Follow 19 views (last 30 days) Show older comments I cannot seem to get my image to display the coordinates of my mouse cursor, and also use ginput to store points at the same time.

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