BODY WITH MIRROR SURFACE AND CONNECTED IN TERIOR INVISIBLE FROM ONE POINT

The article presents one of the possible options for implementing the lighting technology "Flat beam" for landscape lighting purposes. One of the possible ways to control the light distribution of a number of light sources based on LEDs with different radiation patterns is considered. As a secondary optics, it is proposed to use a mirror surface that redistributes the light flux of an LED light source. It is indicated that, depending on the initial type of the light-emitting diodes light curve and the features of mounting the mirror surface, the resulting light distribution can vary widely, depending on the initial task that the designer sets for himself.

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Three-Dimensional Mirror Surface Measurement Based on Local Blur Analysis of Phase Measuring Deflectometry System

Traitement du signal ◽

10.18280/ts.370508 ◽

2020 ◽

Vol 37 (5) ◽

pp. 763-771

Author(s):

Hongyu Sun ◽

Le Wang ◽

Zhan Song ◽

Geng Chen

Keyword(s):

Measurement Techniques ◽

Three Dimensional ◽

Block Matching ◽

Surface Measurement ◽

Mirror Surface ◽

Reconstruction Accuracy ◽

Surface Reflection ◽

Block Matching Algorithm ◽

Reflective Mirror ◽

Spatially Varying

Despite the marked progress in recent years, structured light-based three-dimensional (3D) measurement techniques still have difficulty in capturing mirror surface reflection. The accuracy of 3D reconstruction for mirror objects should be further improved to adapt to the high reflectivity and curvature of such objects. To improve the stripe definition and reconstruction accuracy of highly reflective mirror objects, this paper analyzes the local blur of defocus stripes in phase measuring deflectometry (PMD) system, and presents a method to analyze the spatially varying defocusing and de-blurring, with the aid of a 3D block matching algorithm, thereby focusing on defocus stripes. Experimental results show that the proposed method can achieve micron-level reconstruction accuracy of standard flat mirrors, and detect the defects on highly reflective mirror objects at a high precision.

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AN ANALYTIC STUDY OF MIRROR SURFACE SHAPES WHICH REFLECT THE RAYS FROM A PIN HOLE IN THE FORM OF EQUI-SOLID ANGLE REPRESENTATION OR EQUI-DISTANCE PROJECTION

Transactions of the Architectural Institute of Japan ◽

10.3130/aijsaxx.234.0_61 ◽

1975 ◽

Vol 234 (0) ◽

pp. 61-67

Author(s):

YASUO NISHI ◽

TAKEO KOZIMA ◽

HIROSHI NAKAMURA ◽

SYUNTARO HIGA ◽

SYUNZI OKAMOTO

Keyword(s):

Solid Angle ◽

Analytic Study ◽

Mirror Surface

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Testing the Egocentric Mirror-Rotation Hypothesis

Seeing and Perceiving ◽

10.1163/187847510x540000 ◽

2010 ◽

Vol 23 (5) ◽

pp. 373-383 ◽

Cited By ~ 3

Author(s):

Cornelius Muelenz ◽

Matthias Gamer ◽

Heiko Hecht

Keyword(s):

Virtual World ◽

Experimental Setup ◽

Mirror Surface ◽

Localization Task ◽

Two Stage ◽

Egocentric Bias ◽

The Law ◽

Spatial Locations ◽

As If

AbstractAlthough observers know about the law of reflection, their intuitive understanding of spatial locations in mirrors is often erroneous. Hecht et al. (2005) proposed a two-stage mirror-rotation hypothesis to explain these misconceptions. The hypothesis involves an egocentric bias to the effect that observers behave as if the mirror surface were rotated by about 2° to be more orthogonal than is the case. We test four variants of the hypothesis, which differ depending on whether the virtual world, the mirror, or both are taken to be rotated. We devised an experimental setup that allowed us to distinguish between these variants. Our results confirm that the virtual world — and only the virtual world — is being rotated. Observers had to perform a localization task, using a mirror that was either fronto-parallel or rotated opposite the direction of the predicted effect. We were thus able to compensate for the effect. The positions of objects in mirrors were perceived in accordance with the erroneous conception that the virtual world behind the mirror is slightly rotated and that the reconstruction is based on the non-rotated fronto-parallel mirror. A covert rotation of the mirror by about 2° against the predicted effect was able to compensate for the placement error.

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