Rotate Image Matrix

Rotate the image by 90 degrees (clockwise). NET Matrix Library Enter your matrix in the text area below: (maximum matrix size is 32 x 32) Show instructions. 0 Bonus Tools User's Guide & Manual - Free download as PDF File (. 30 Unique cross-platform multilayer image processing software development kit. Here Rotating function is going to be added on the last exercise "Skew Bitmap Image Using Matrix" It's a SeekBar on the screen to change the degree to rotate the bitmap, by using of Matrix. Below are rotations of a test card of random shapes (so you can see the effect of the shears), a Spitfire, and Tigger. Definition and Usage. This matrix cannot take the translation of the camera into consideration because if it did, all of your particles would be placed on the position of the camera. You are given an n x n 2D matrix representing an image. For each image, I've shown the source, the results of applying the three shear matrices in order and, for comparison, the image produced by the standard 2D rotation matrix (sometimes called a rotation by selection). At the end of the article you can find the matlab code. for Java and C++ code to implement these rotations click here. From my original beauty: These are several image rotation on degrees: Pretty nice effect! Here the implemetatio…. When s is set to 1. By default, the rotation matrix is post-multiplied. Hint: consider the relationship between the indices of the old and new matrices. Pji MtitProjection Matrix The 4The 4××4 projection matrix is really just a linear 4 projection matrix is really just a linear transformation in homogeneous space It doesn’t actually perform the projection, but just sets things up right for the next step. It is possible to set a transformation matrix on the 2D Context. EventArgs) Handles Me. don’t make a new array to copy into). A 2-d FT is a little more complex, but it still works out to a matrix multiply. Rotate the image by 90 degrees (clockwise). About "Rotation transformation matrix" "Rotation transformation matrix" is the matrix which can be used to make rotation transformation of a figure. Hi I've noticed in the source code that in the Rotate method of Image - a convenience method not found in OpenCV - Emgu not only creates the rotation matrix through an internal call, but seems to perform some extra modifications when applying it to an Image. An image file format may store data in uncompressed, compressed, or vector formats. - Have a folder open with several videos inside - Double click on a video which launches VLC - Image Properties filter is now working correctly like it should - Now while VLC is still opened, double click on another video which opens in VLC however now the Image Properties filter does not take effect. This post will help you learn how to rotate images using opencv python library. It creates an array of PointF structures holding the bitmap’s corners and uses the Matrix to rotate the corners. Then we create a Bitmap object from a file and call the DrawImage method, which draws the image on the form. Matrix class offers exactly what we need (and a lot more). xrotatemat(mat,rsin,rcos). The image is going to be rotated around the center of the selection. Rotates the matrix in Clockwise and Counterclockwise as per requirement. A rotation by 90 degrees can be accomplished by two reflections at a 45 degree angle so if you take the transpose of the matrix and then multiply it by the permutation matrix with all ones on the minor diagonal and all zeros everywhere else you will get a clockwise rotation by 90 degrees. Problem Note. Online Matrix Calculator Powered by. We learned to use the scale, translate, and rotate transforms to size and rotate an image. Follow up: Could you do this in-place? 思路: 选择n*n的矩阵. method "simple" assumes values to destination', "NN" obtains values from the source image by inverse rotation with "nearest neighbor", and "bilinear" performs the same but with "bilinear interpolation" of the source image. In short, it all revolves around matrices and there is a matrix known as a transformation matrix. rotate-image. Rotate Image (Java) at January 13, 2014. MatrixTransform. Used for adjusting image plotting in R. Matrix indices are the "coordinates" and matrix elelements are the color/shade of grey. Rotate an N x N matrix, in place, using c++. If the image has pixel alphas, the padded area will be transparent. Rotating, reversing, turning, or flipping an image allows you to correctly display an image taken with a camera or scanned in with a scanner at a different angle. Rotations can be represented by orthogonal matrices ( there is an equivalence with quaternion multiplication as described here). You can rotate different shapes (point-by-point) by an angle, around a center point below. 11 time but I think doing this job on a 4000x4000 pixel image is still not really fast in native LV. Note: You have to rotate the image in-place, which means you have to modify the input 2D matrix directly. another common reason for doing this is to scale a polygon about an arbitrary point (e. Free vector icon. function im_2 = rotate_image_regrid (im, angle) % Rotates matrix or grayscale image im counter-clockwise by angle % specified by angle. Borrowing aviation terminology, these rotations will be referred to as yaw, pitch, and roll: A yaw is a counterclockwise rotation of about the -axis. There is much more to learn about the coordinate system and the matrix transforms. Look at the figure below: the points 1, 2 and 3 (forming a triangle in image 1) are mapped into image 2, still forming a triangle, but now they have changed notoriously. You have to rotate the image in-place, which means you have to modify the input 2D matrix directly. imrotate makes the output image J large enough to contain the entire rotated image. 2 the "spline" still does not work. If a mask is provided, the method returns a histogram for those parts of the image where the mask image is non-zero. /L1"C/C++" C_LANG Line Comment = // Block Comment On = /* Block Comment Off = */ Escape Char = \ String Chars = "' File Extensions = C CPP CC CXX H HPP AWK. A rotation maps every point of a preimage to an image rotated about a center point, usually the origin, using a rotation matrix. Note that if you end up using an additional array, you will only receive partial score. That was the 7. Rotate an image, table or paragraph in LaTeX. Used for adjusting image plotting in R. Find Inorder Successor of a node in a binary tree There is a big file of words which is dynamically Ancestor Matrix Problem. Because after we rotate an image we can have a bigger width or height. NET using just GDI+. There, you can set the rotation axis, marked with a point, and the rotation angle. This example lets you click and drag around the image's center to specify the angle of rotation. There are several ways to flip an image in C#. When s is set to 1. 2 the "spline" still does not work. The first image represents the initial matrix and the second represents the matrix rotated by 45 degrees. If you select Expanded to fit rotated input image, the block outputs a matrix that contains all the rotated image values. image contains the basic definition of an Image object and all the functions that are used behind the scenes to apply transformations to such an object. It takes window name and image matrix as an argument in order to display an image in a display window with a specified window name. Given a square matrix, rotate the matrix by 180 degrees in clock-wise direction. 316) C# VB Download VB Download. The following practice questions test your knowledge of rotations by asking you to rotate …. It does this by rotating the surface through 360 degrees in increments of 10 degrees using XOBJVIEW_ROTATE, and writing the display image to a BMP file for each increment using XOBJVIEW_WRITE_IMAGE. Matrix to rotate, scale, skew and translate bitmap images in android. The formula is pretty easy to use so long as your remember matrix multiplication so I spent more time on the justification part since it is more interested! Rodrigues Rotation Formula and. 17 there is still a matrix subclass, which offers a Matlab-like syntax for manipulating matrices, but its use is no longer encouraged and (with luck) it will be removed in future. I write a function to rotate a matrix by 90 degrees clockwise, this function works on a matrix of specific size, for example, it rotates a 4*4 matrix of integers in the following code. Note: You have to rotate the image in-place, which means you have to modify the input 2D matrix directly. GLSL rotation about an arbitrary axis 11th of January 2013. If object is None, then rotate rotates the atomic coordinates according to the axes and angle for the selection and state provided. void cairo_rotate (cairo_t *cr, double angle); Modifies the current transformation matrix (CTM) by rotating the user-space axes by angle radians. By the end, you will understand how to rotate the image in Java. They do not change the image content but deform the pixel grid and map this deformed grid to the destination image. There are several ways to flip an image in C#. You are given an n x n 2D matrix representing an image. element { transform: rotate(25deg); } This rotates an element clockwise from its original position, whilst a negative value would rotate it in the opposite direction. Time Complexity: O(m*n) for matrix (mxn). Opencv can be used to rotate the image in any direction that user wants. The exact angle I will have to decide later on. Rotate the given image by 90 degrees. Hi I've noticed in the source code that in the Rotate method of Image - a convenience method not found in OpenCV - Emgu not only creates the rotation matrix through an internal call, but seems to perform some extra modifications when applying it to an Image. rotate – Rotate an object around the transform origin. Rotate the image by 90 degrees (clockwise). I dont know if it can be done. % format of the matrix is the same as of "in_ref_points_m" % % NOTE: By definition of rotation, in order to perserve all the image inside the % rotated image space, the output image will be a matrix with a bigger size. When you rotate something, the center of rotation is the only point that won't move. As you are duplicating the "flipped" image, you will calculate how much white blend you need to make. How can I rotate images in MATLAB without using imrotate? You can always apply a 2d rotation matrix to get the rotated coordinates of your image. See an example | Whats-online. The pivot points are (12, 32) and (66, 32). % format of the matrix is the same as of "in_ref_points_m" % % NOTE: By definition of rotation, in order to perserve all the image inside the % rotated image space, the output image will be a matrix with a bigger size. We scale the rotate so the model moves 180 degrees when we move the mouse from one side of the window to another side. image(img, img. The formula is pretty easy to use so long as your remember matrix multiplication so I spent more time on the justification part since it is more interested! Rodrigues Rotation Formula and. This option is intended for use in animations. The basic properties are translate3d, scale3d, rotateX, rotateY and rotateZ. The following are code examples for showing how to use cv2. Approach to rotate a matrix by 90 degrees First we transpose the matrix and swap the columns to rotate the matrix by 90 degrees. 2 안드로이드에서 Matrix 클래스로 이미지를 회전시켜 보겠습니다. Here I added the code below to rotate the image at any possible angle using Matrix. You need to do this in place. Right-click on the image in Microsoft Word. If a mask is provided, the method returns a histogram for those parts of the image where the mask image is non-zero. In this post I’ll show how to rotate an image with animation. Use the hue-rotate() function to apply a hue rotation on an image. Let see this image : he's runing South_East (Down-Right) ! His spear heading Down-Right. Coordinates in PDF are described in 2-dimensional space. Arguments x A raster image or a matrix angle Plus(>0) value to request clockwise rotation, while minus for anticlockwise rotation. imshow() Wait for keyboard button press using cv2. Last week I wrote a tip to demonstrate how to move an image on screen using animation. rot90 (m, k=1, axes=(0, 1)) [source] ¶ Rotate an array by 90 degrees in the plane specified by axes. The rotation operator performs a geometric transform which maps the position of a picture element in an input image onto a position in an output image by rotating it through a user-specified angle about an origin. Rotate matrix in 90 degree clockwise. How can I rotate images in MATLAB without using imrotate? You can always apply a 2d rotation matrix to get the rotated coordinates of your image. Among the many cool features and functions of Adobe Acrobat, it also enables you to rotate pages of a PDF document. OpenGL uses 4 x 4 matrix for transformations. Rotate the image by 90 degrees (clockwise). The inspiration for this was from a video by Gayle Laakmann McDowell: https://www. Read more to learn how to rotate a shape 270 degrees!. An approach that requires extra space is already discussed in below set: Inplace rotate square matrix by 90 degrees | Set 1. Rotate the image by 90 degrees (clockwise). a32 (row 3, column 2) Let x be the row and y be the column, so x = 3 and y = 2. For example, the counter-clockwise rotation matrix from above becomes:. This operation is equivalent to translating the coordinates so that the anchor point is at the origin (S1), then rotating them about the new origin (S2), and finally translating so that the intermediate origin is restored to the coordinates of the original anchor point (S3). When you click on the image or the selection with this tool a Rotation adjustment dialog is opened. For more specific information on this function, see documentation provided for the X-Function imgRotate in the Origin X-Function reference file. In Thermimage: Thermal Image Analysis. Translate so that P1 is at the origin Scale Translate so that the point at the origin is at P1. rotate(angle). Next time through the loop you take the picturebox1. js – JavaScript 3D library submit project. rotation of image resulted from below code. 1) Import Data. Source Image. 0, the matrix is exactly the "convert to luminance" matrix described above. Learn more about image processing. Rotate image about its center. This function takes a CSS angle (e. Clockwise & Counterclockwise Rotation of matrix using Numpy Library. (For more on this topic, including the fully general four-dimensional rotation matrix, see the note on Rotations and Anti-Symmetric Tensors. The idea is that you will duplicate and mirror the image across the bottom. Rotate Image (Java) at January 13, 2014. for Java and C++ code to implement these rotations click here. Anyone have some suggestions of how I can do this?. All methods supported by interp2 can be used although as of Octave 4. Here is what I want to do: 1) Load Image (ideally from a resource, currently from a file) 2) Rotate that image 90 or 180 degrees 3) apply image to an already existing control This topic has been helpful in getting start. ) and then blast them onto the screen, flicker-free. By multiplying together different transformation matrices, you get your final. Finally we draw the image again using DrawImage. This is the best place to expand your knowledge and get prepared for your next interview. The user can rotate the torus about the x- or y-axis by pressing the `x' or `y' key when the window has focus. A 3x3 Rotation Matrix is appropriate for use when rotating something in a 3 dimensional coordinate system. scale — resize to new resolution: pygame. image that has 1 deg rotation, and rotate it 2 degrees for a total of 3 degrees and copy back to picturebox. translate, translateX, translateY – Translate an object. That was the 7. rotation of image resulted from below code. Transformation Matrix. Rotate a matrix by 90 degree without using any extra space | Set 2. Finally we draw the image again using DrawImage. How to Rotate Pages in a PDF Document Using Adobe Acrobat. How to Rotate a 2D Matrix by 90 Degrees in Java has a lot to do with basic linear algebra / geometry. There is this great tutorial in 2d transformations, it is really clarifying. Let x be your data vector. MatrixTransform. Every point of the body moves in a circle, whose center lies on the axis of rotation, and every point experiences the same angular displacement during a particular time interval. x = PX camera matrix 3D world point 2D image point What do you think the dimensions are? A camera is a mapping between the 3D world and a 2D image. Obviously you'll start by reading an image from disk, or grab it from a video frame and so on, similar to this: After that depending on the required transformation use any of the … Continue reading "How to Rotate and/or Flip (Mirror) Images in OpenCV". Write a function that returns the length of the lo To find if there is any root to leaf path with spe Non-Recursive Implementation of Post order. The following are code examples for showing how to use scipy. You are given an n x n 2D matrix representing an image. Photo, sketch and paint effects. Rotation Matrices: These matrices rotate data without altering its shape. Positive angles are measured in a counter-clockwise direction by convention. You can use degree * Math. Asked: 2016-03-06 07:29:58 -0500 Seen: 538 times Last updated: Mar 06 '16. First, notice that a 90 degree clockwise rotation is a matrix transpose, followed by a reflection (or if you prefer, a rotation), along the center of the array in the vertical direction. Now let's say you have an array of buckets - an array of cells or a "Cell Array". Flip an image horizontally, like a mirror, with the left-right arrow button in the Rotate tool. element { transform: rotate(25deg); } This rotates an element clockwise from its original position, whilst a negative value would rotate it in the opposite direction. Then if we swap first column with the last column, second column with the second last column, and so on. Multiplying everything by the Projection Matrix has the following effect : In this image, the frustum is now a perfect cube (between -1 and 1 on all axes, it's a little bit hard to see it), and all blue objects have been deformed in the same way. another common reason for doing this is to scale a polygon about an arbitrary point (e. You have to rotate the image in-place, which means you have to modify the input 2D matrix directly. First I tried to rotate an Image by using built in functions in Matlab. Example 1:. Every other will go around it by however much you specify. how to rotate an image using rotation matrix. A composite transformation is made up of the product of two or more matrices. Version History. It is available to all who like to help you (we haven't your actual image) function of landscape and sidevaysfigure are similar: both enable to how page content in portrait orientation, i. I wonder how I can rotate the image by 90 degree in this case! At the time when transformed() is called with the rotation matrix, there is just QImage, so it always works the same way. This method returns a new image that is big enough to display all of the contents of the original image. ?? > > Maybe you could post an image of the result you are getting and what you. This function takes a CSS angle (e. Rotate square matrix by 90 degrees clockwise Inplace OR Turn an 2D array by 90 degree Clockwise OR Rotate a two dimensional array OR Given N*N matrix, rotate it by 90 degree to left and right without extra memory. Rotational variables. Look at the figure below: the points 1, 2 and 3 (forming a triangle in image 1) are mapped into image 2, still forming a triangle, but now they have changed notoriously. We know that we can represent image as a matrix, and matrix can not be elliptical. First row of given matrix will be last column and of a rotated matrix, second row will be last but one and so on. The mask image must have the same size as the image, and be either a bi-level image (mode “1”) or a greyscale image (“L”). This was also doing image processing and I had to write my own rotate and mirror library in C. The rotating package provides easy-to-use functionality to rotate content. This seems easy enough, and I have it mostly working. From the angle and from the image center Point we will know the rotation matrix in 2D. This matrix is presented in Graphics Gems (Glassner, Academic Press, 1990). ?? > > Maybe you could post an image of the result you are getting and what you. Rotate a matrix by 180 degrees. By the end, you will understand how to rotate the image in Java. EventArgs) Handles Me. You need to somehow make mMainImg point to your image view. You need to do this in place. Each bucket can contain something different, or they might all contain the same type of variable. At the end of the article you can find the matlab code. However, it's very simple to change the point of reference just adjusting matrix r, can you do this?. In linear algebra, a rotation matrix is a matrix that is used to perform a rotation in Euclidean space. The CanvasRenderingContext2D. xyz is an orthogonal matrix. OpenCV provides closer control over the creation of this matrix through the function, getRotationMatrix2D. We then iterate of the length of each layer and shift our matrix cells, side for side:. postRotate(). Use this matrix to rotate objects about their center of gravity, or to rotate a foot. Description Usage Arguments Value Author(s) References See Also Examples. Problem description: Given an N X N integer matrix, rotate it bye 90 degrees in place. A five degree counter-clockwise rotation with bilinear interpolation produces an image that is slightly larger than the original surrounded by black regions that do not map to any pixels in the original image. What we want to do is building a second matrix based on the matrix A, which is going look like this. consisting of number of rows ,columns and number of planes. We denote this angle θ meaning that each pixel in f (x, y) is rotated θ degrees. These functions take lengths or percentages as arguments. In linear algebra, a rotation matrix is a matrix that is used to perform a rotation in Euclidean space. Rotate image 90 degree in picture box. Free space color can be set to transparent (with formats which support transparency) or any needed color. The matrix that results from these 3 steps can then be applied to all of the points in the polygon. Offset the drawing by negative one-half the height and width of the image or rectangle. How do you rotate a figure 360 degrees clockwise on a graph? 360 degree rotation (clockwise or anticlockwise) leaves any figure in exactly the same position as it was at the start. The image is going to be rotated around the center of the selection. chonada wrote:I am doing a photoeditor application and we have a button to rotate the image in the canvas (which is actually an image switcher), now while i did the rotation using the Matrix, i found that the image is shrinking when rotating (noticeable when rotating continuously), code snippet given below, any suggestions will be appreciated. 44921e_16 2. Let's learn how to rotate an image in android. The main goal of this tutorial is to create three methods for rotating images Rotate by 180 degreesRotate by 90 deggres to the leftRotate by 90 degree to the rightSo let’s go to the. The Image module provides a class with the same name which is used to represent a PIL image. Lunapics Image software free image, art & animated Gif creator. For example, calling rotate(PI/2. This means that while an image displayed in a graphics window appears to rotate counterclockwise, an array printed in the command log appears to rotate clockwise. Therefore in general Translate x Rotate is different from Rotate x Translate. For an orthogonal rotation matrix in three dimensional space, we find the determinant and the eigenvalues. imrotate makes the output image J large enough to contain the entire rotated image. The rotate() method of Python Image Processing Library Pillow takes number of degrees as a parameter and rotates the image in counter clockwise direction to the number of degrees specified. The rotation center point is always the canvas origin. Input parameters: imgPre a gray-level image matrix theta the rotation angle in degrees counterclockwise The optional argument method defines the interpolation method to be used. There is much more to learn about the coordinate system and the matrix transforms. It takes window name and image matrix as an argument in order to display an image in a display window with a specified window name. Note: You have to rotate the image in-place, which means you have to modify the input 2D matrix directly. I have been searching in the forum and I think that there is no easy solution to my problem, but I will ask anyway. image of matching points I. The returned object contains an additional component rotate determining the rotation. Unless otherwise noted, each option is recognized by the commands: convert and mogrify. I have upcoming FAANG interviews for SWE (~4 years experienced) in a month. Given a square matrix, rotate matrix by 90 degrees in clock-wise direction. OpenGL uses 4 x 4 matrix for transformations. As you are duplicating the "flipped" image, you will calculate how much white blend you need to make. 0 Bonus Tools User's Guide & Manual. Line 9 is the rotation and line. You are given an n x n 2D matrix representing an image. The rotate() method of Python Image Processing Library Pillow takes number of degrees as a parameter and rotates the image in counter clockwise direction to the number of degrees specified. Read more to learn how to rotate a shape 270 degrees!. We can rotate the image through 180 degrees about the image (and circle) center at to produce If we use these same parameter settings but a new, smaller image, such as the 222×217 size artificial, black-on-white image. # -*- coding: utf-8 -*-# transformations. You applied rotate on a two vectors of coordinates - so its no surprise you didn't get what you want. Transformations play an. These days it is now possible to rotate an image with CSS using the transform property. Since many other sites describe the code that flips images with the Image class, this article covers image flipping with Graphics and Matrix classes. I have been searching in the forum and I think that there is no easy solution to my problem, but I will ask anyway. What we want to do is building a second matrix based on the matrix A, which is going look like this. LeetCode - Rotate Image (Java) You are given an n x n 2D matrix representing an image. Example 1:. Use the following rules to rotate the figure for a specified rotation. Your browser does not support frames. Enter a scalar value, between 0 and π radians. rotate =: monad def '2 2 $ 1 1 _1 1 * 2 1 1 2 o. rotate — rotate an image: pygame. Here Rotating function is going to be added on the last exercise "Scale bitmap image, using Matrix". The "view inverse matrix" is probably a 3×3 matrix (or a 4×4 matrix with no translation) that represents a matrix that will anti-rotate the particle to face the camera. Simple Hue Rotation To rotate the hue, we perform a 3D rotation of RGB colors about the diagonal vector [1. A composite transformation is made up of the product of two or more matrices. Since relates 02 images, we can analyze the simplest case in which it relates three points in both images. Multiplying everything by the Projection Matrix has the following effect : In this image, the frustum is now a perfect cube (between -1 and 1 on all axes, it's a little bit hard to see it), and all blue objects have been deformed in the same way. Your rotation routines will work very much the same. Having solved DP problems in the past that require triangular traversal of a matrix, it was in my mental toolbox of things to consider. The key idea is to rotate the matrix according to layers. A raster graphics image is a dot matrix data structure, representing a generally rectangular grid of pixels, or points of color. The array is rotated in the plane defined by the two axes given by the axes parameter using spline interpolation of the requested order. C Program to Rotate 2D array by 90 degrees This concept is used in rotating images. Time Complexity: O(m*n) for matrix (mxn). The transformation is defined as I tried to go through some of the core functionality tutorials, but I'm already lost at the 3rd chapter. This article will show you examples about how to use android. Download thousands of free icons of business and finance in SVG, PSD, PNG, EPS format or as ICON FONT. If you want to rotate a shape 180 degrees around the point of origin, turn the x and y coordinates into -y and -x coordinates. Rotating the entire screen. In this post I’ll show how to rotate an image with animation. You are given an n x n 2D matrix representing an image. Image files are composed of digital data in one of image file format that can be rasterized for use on a computer display or printer. Transformations Reflection Translation Rotational Symmetry Geometry Index. Set Matrix Zeroes Total Accepted: 10610 Total. This operation is equivalent to translating the coordinates so that the anchor point is at the origin (S1), then rotating them about the new origin (S2), and finally translating so that the intermediate origin is restored to the coordinates of the original anchor point (S3). Image : An image can be represented as a 2D matrix which can be stored in a buffer. Click Image at the top of the image toolbar. I worked out a derivation in this article. To use this function, select Image: Geometric Transform: Rotate from the Origin menu. This monad is applied to an angle, expressed in degrees. So, the matrix contains it's base address. Online Matrix Calculator Powered by. Introduction. How to Generate & Print Barcode Data Matrix Image in Jasper Reports / iReport/ BIRT ? 8. Follow up: Could you do this in-place? public class Solution { public void rotate(int[][] matrix)…. If optional parameters x and y are not supplied, the rotation is about the origin of the current user coordinate system. Problem Rotate the n*n matrix by 90 degrees. We can define a J monad, rotate, which produces the rotation matrix. With GraphicsMagick you can create GIFs dynamically making it suitable for Web applications. Print cheque rotated by 90 degrees. The Image Module¶. Rotate Matrix: You are given an n x n 2D matrix representing an image. However, the user might not want to rotate it back, so you have to perform interpolation or quantization to be able to use the rotated image. def rotate (self, matrix): mLen = len (matrix) # The dimensions of the matrix. An approach that requires extra space is already discussed in below set: Inplace rotate square matrix by 90 degrees | Set 1. To bring up the rotate handles, simply click on an object, and then click again (do not double-click).