scholarly journals IMPROVING MEASUREMENTS’ SPATIAL PRECISION BY MEANS OF 3D PRINTERS-BASED SYSTEMS. A CASE STUDY: COLORIMETRIC ASSESSMENT OF MODERNIST HYDRAULIC TILES

2021 ◽  
Vol XLVI-M-1-2021 ◽  
pp. 265-271
Author(s):  
M. Gaudenzi Asinelli ◽  
J. Aparicio Estrems ◽  
J. Caballé Benavent
Keyword(s):  
Imaging System ◽  
Calibration Method ◽  
Treatment Manual ◽  
Positioning Systems ◽  
Conservation Treatment ◽  
Open Hardware ◽  
G Code ◽  
3D Printers ◽  
The Right ◽  
Automatic Positioning

Abstract. The ability to repeat analyses on the same very small area of a surface is crucial to obtain reliable comparative data. For example, in a painting the boundary between two different, small painted areas can be very blurred; if an analyst needs to track over the time a specific and tiny pigment spot (e.g., to assess the reliability of a conservation treatment), manual positioning of the analyser can lead to a mismatch that might undermine any data comparison. The use of automatic positioning systems can improve the ability to hit the right spot, so to collect reliable data. This work focuses on the development of an open hardware XYZ system based on 3D printers’ architecture and equipped with an imaging system. It demonstrates that the combination of image processing methods with the G-code generated during the movements of the XY axes can allows to avoid misalignment of the object that needs to be analysed, and thus to improve measurements’ spatial precision. The XYZ positioning system and the positioning calibration method are now tested on Modernist hydraulic tiles from Barcelona (Catalunya, Spain), a decorative and functional element in danger because of the estate speculation that is affecting the architectonic identity of the Catalan capital.

scholarly journals HYBRID ONLINE MOBILE LASER SCANNER CALIBRATION THROUGH IMAGE ALIGNMENT BY MUTUAL INFORMATION

2016 ◽  
Vol III-1 ◽  
pp. 25-31 ◽  
Author(s):  
Mourad Miled ◽  
Bahman Soheilian ◽  
Emmanuel Habets ◽  
Bruno Vallet
Keyword(s):  
Mutual Information ◽  
Imaging System ◽  
Laser Scanner ◽  
Point Clouds ◽  
Calibration Method ◽  
Online Calibration ◽  
Calibration Methods ◽  
Laser Calibration ◽  
Scanner Calibration

This paper proposes an hybrid online calibration method for a laser scanner mounted on a mobile platform also equipped with an imaging system. The method relies on finding the calibration parameters that best align the acquired points cloud to the images. The quality of this intermodal alignment is measured by Mutual information between image luminance and points reflectance. The main advantage and motivation is ensuring pixel accurate alignment of images and point clouds acquired simultaneously, but it is also much more flexible than traditional laser calibration methods.

From Modeling to 3D Printing

2017 ◽  
pp. 25-37 ◽  
Keyword(s):  
3D Printing ◽  
Internal Representation ◽  
Modeling Process ◽  
Wire Frame ◽  
G Code ◽  
3D Printers ◽  
Boundary Representations ◽  
Code Standard ◽  
Printing Parameters ◽  
Bézier Spline

Geometric or 3D modeling playing key role in geometry definition. These modelers evolved from wire-frame models to Boundary representations or CSG models in solid modeling or Bezier spline or Non-uniform rational B-spline representation. After modeling process, using internal representation, part will be post-processed for manufacturing. Variety of postprocessors existing, and using unique G-code standard we producing on CNC machines requested parts. 3D Printers use the same G-Code standards with extensions for more than ten M functions that programmers use for setting 3D printing parameters different than we using for CNC manufacturing. List of M functions varies depend of the manufacturer.

Calibration Method of Micro-polarizer Array Long-wave Infrared Imaging System

2019 ◽  
Vol 48 (6) ◽  
pp. 611004
Author(s):  
闫羽 YAN Yu ◽  
徐小红 XU Xiao-hong ◽  
范之国 FAN Zhi-guo ◽  
张强 ZHANG Qiang ◽  
金海红 JIN Hai-hong
Keyword(s):  
Infrared Imaging ◽  
Imaging System ◽  
Calibration Method ◽  
Infrared Imaging System ◽  
Long Wave ◽  
Long Wave Infrared

Channel Calibration Method for ISAR Imaging System

2018 ◽  
Author(s):  
Baofeng Guo ◽  
Ning Han ◽  
Lin Shi ◽  
Huiyan Zeng ◽  
Guanjun Chen ◽  
...  
Keyword(s):  
Imaging System ◽  
Calibration Method ◽  
Isar Imaging

Precision-based regularization comparametric calibration method for imaging system response functions

2018 ◽  
Vol 92 ◽  
pp. 409-416 ◽  
Author(s):  
Anding Wang ◽  
Xufen Xie ◽  
Hongyuan Wang ◽  
Nianyu Zou ◽  
Yingying Shang
Keyword(s):  
Imaging System ◽  
Calibration Method ◽  
System Response ◽  
Response Functions

Fundamental Comparison of Image Quality Metrics

Perception ◽  
1997 ◽  
Vol 26 (1_suppl) ◽  
pp. 81-81
Author(s):  
P G J Barten
Keyword(s):  
Image Quality ◽  
Spatial Frequency ◽  
Imaging System ◽  
Quality Metrics ◽  
Sensitivity Function ◽  
Just Noticeable Difference ◽  
Modulation Transfer ◽  
Image Quality Metrics ◽  
Comparison Of The Results ◽  
The Right

In most image quality metrics (eg MTFA, ICS, SQF, DDD, SQRI) use is made of the modulation transfer function (MTF) of the imaging system and the contrast sensitivity function (CSF) of the human visual system. All metrics usually show a positive correlation with perceived image quality. This does not, however, say much about the correctness of the underlying equations. Defocusing experiments where an image is defocused by one just-noticeable difference can give information about the contribution of different spatial-frequency ranges to image quality. By performing defocusing experiments with images where contrast is also varied, information can be obtained about the dependence of image quality on contrast. In our investigation defocusing measurements from Baldwin (1940), Carlson and Cohen (1980) and Watt and Morgan (1983) were used. Comparison of the results with the fundamental dependence of some image quality metrics on spatial frequency and contrast indicates that only the SQRI (square-root integral) showed the right behaviour with respect to these parameters.

scholarly journals Making Anaglyphs in Photoshop

2005 ◽  
Vol 13 (3) ◽  
pp. 36-39 ◽  
Author(s):  
Jerry Sedgewick
Keyword(s):  
Imaging System ◽  
Three Dimensional ◽  
Ct Scans ◽  
Two Dimensional ◽  
The Right ◽  
Two Dimensional Images

In order to achieve a three dimensional appearance to a pair of two dimensional images, two off-axis images can be produced and colorized. These can be overlayed slightly apart and then viewed through glasses with two differently colored sides, one color for the left eye and another for the right eye in combinations containing red, green or blue colors. These off-axis and colorized images are referred to as anaglyphs.Off-axis images can be achieved through the use of a tilting stage on a microscope, by physically changing the position of a camera in relation to a still object, or through changing the axis of an optical stack of sections, such as what is created by confocal/CT scans. Some images lend themselves more to a 3D look both by virtue of inherent three dimensionality limited by the resolution of the imaging system.

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