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Computer Systems
Published in Sharon Yull, BTEC National for IT Practitioners: Core Units, 2009
GUIs, such as Microsoft Windows XP and Vista, can be characterized by a number of features, including: A pointer – a symbol that appears on the screen that allows you to move and select objects or commands. The pointer usually appears as a small angled arrow.A pointing device – such as a mouse or trackball, that enables you to select objects on the screen.Menus – most GUIs allow the user to carry out tasks and functions by selecting an option from a menu (Figure 2.7). Icons – these are miniature pictures that represent commands, files or windows (Figure 2.8). The pictures represent pictures of the actual commands, for example a rubbish bin to represent ‘rubbish’ and a disk to represent ‘save’. When the picture is selected the command is executed. Desktop – this is the area on the display screen where icons are grouped (Figure 2.9). This is often referred to as the desktop because the icons are intended to represent real objects on a real desktop. Windows – these can divide the screen into different areas. In each window, a different programme or file can be displayed.
Drawing, erasing and the selection set
Published in Bob McFarlane, Beginning AutoCAD 2002, 2012
Move the pointing device to any other point on the screen and left-click. Another cross may appear at the selected point and a line will be drawn between the two ‘picked points’. This is your first AutoCAD 2002 object
Development of a pointing device using surface electromyograms generated by mouth movements
Published in Cogent Engineering, 2022
Junichi Hori, Takahisa Inakoshi
It is possible to use the surface EMG method that quantifies mouth movements as a pointing device because complicated voluntary movements can be easily measured with increased accuracy. In this study, we aimed to develop a pointing device that can move the cursor to an arbitrary location without direction or distance limits. We proposed a pointing device that only uses mouth movements. And realized a natural mapping that controls the vertical and horizontal movement of the pointer by the vertical and horizontal movement of the mouth. Using four sets of active bipolar electrodes attached to the left and right zygomatic and depressor angle oris muscles, the distances and directions of the pointer movements were determined from the composite vector generated by the four EMG signals. Moreover, we aimed to improve accuracy by using more intuitive visual feedback. According to our method, we can expect to move the pointer to any place.
3D superimposition of dental casts based on coloured landmark detection using combined computer vision and 3D computer graphics techniques
Published in Computer Methods in Biomechanics and Biomedical Engineering: Imaging & Visualization, 2020
Sameh Talaat, Ahmed Kaboudan, Omar Abdelbary, Katherine Kula, Ahmed Ghoneima, Reinhard Klein, Christoph Bourauel
This technique should enable registration and analysis of large batches of sequential 3D scanned models with minimal operator interference. This technique minimizes the human error, e.g. landmark identification and marking with a pointing device on a computer monitor. All digital meshes are pre-marked by a colour pen at the landmarks of interest, then colour scanned and saved as PLY files, and presented to our new algorithm for physical detection of the spatial 3D value of each landmark. These auto-detected points can be used for registration and possibly for other processes based on arbitrary landmark selection. This should help to reduce the human errors required to locate these landmarks and should allow for automatic batch assessments of a series of models representing different stages of the orthodontic treatment.
An Empirical Comparison between the Effects of Normal and Low Vision on Kinematics of a Mouse-Mediated Pointing Movement
Published in International Journal of Human–Computer Interaction, 2022
Yuenkeen Cheong, Chen Ling, Randa Shehab
A multidirectional reciprocal Fitts’ pointing task was generated using IDTest (IBM, 1999) running on a Windows-based laptop computer with 1280-by-800 pixels screen resolution. The pointing device used was a Microsoft Optical Mouse connected to the computer via universal serial bus (USB) port.