The data explosion: tackling the taboo of automatic feature recognition in airborne survey data

Antiquity ◽  
2014 ◽  
Vol 88 (341) ◽  
pp. 896-905 ◽  
Author(s):  
Rebecca Bennett ◽  
Dave Cowley ◽  
Véronique De Laet
Keyword(s):  
Feature Detection ◽  
Feature Recognition ◽  
Remote Sensing Data ◽  
New Wave ◽  
Computer Aided ◽  
Automatic Feature Recognition ◽  
Photographic Survey ◽  
Types Of Information ◽  
Airborne Survey ◽  
New Generation

The increasing availability of multi-dimensional remote-sensing data covering large geographical areas is generating a new wave of landscape-scale research that promises to be as revolutionary as the application of aerial photographic survey during the twentieth century. Data are becoming available to historic environment professionals at higher resolution, greater frequency of acquisition and lower cost than ever before. To take advantage of this explosion of data, however, a paradigm change is needed in the methods used routinely to evaluate aerial imagery and interpret archaeological evidence. Central to this is a fuller engagement with computer-aided methods of feature detection as a viable way to analyse airborne and satellite data. Embracing the new generation of vast datasets requires reassessment of established workflows and greater understanding of the different types of information that may be generated using computer-aided methods.

Using Automatic Feature Recognition to Interface CAD to CAPP

1992 ◽  
Author(s):  
Eric Wang
Keyword(s):  
Pattern Matching ◽  
Feature Recognition ◽  
Scale Up ◽  
Fundamental Difference ◽  
Computer Integrated Manufacturing ◽  
Semantic Gap ◽  
Recognition Method ◽  
Computer Aided Process Planning ◽  
Computer Aided ◽  
Automatic Feature Recognition

Abstract Interfacing CAD to CAPP (computer-aided process planning) is crucial to the eventual success of a fully-automated computer-integrated manufacturing (CIM) environment. Current CAD and CAPP systems are separated by a “semantic gap” that represents a fundamental difference in the ways in which they represent information. This semantic gap makes the interfacing of CAD to CAPP a non-trivial task. This paper argues that automatic feature recognition is an indispensable technique in interfacing CAD to CAPP. It then surveys the current literature on automatic feature recognition methods and systems, and analyzes their suitability as CAD/CAPP interfaces. It also describes a relatively recent automatic feature recognition method based on volumetric decomposition, using Kim’s alternating sum of volumes with partitioning (ASVP) algorithm. The paper’s main theses are: (1) that most previous automatic feature recognition approaches are ultimately based on pattern-matching; (2) that pattern-matching approaches are unlikely to scale up to the real world; and (3) that volumetric decomposition is an alternative to pattern-matching that avoids its shortcomings. The paper concludes that automatic feature recognition by volumetric decomposition is a promising approach to the interfacing of CAD to CAPP.

scholarly journals Practical method for the fast generation of a CAM model for jet engine parts

2021 ◽  
Vol 13 (3) ◽  
pp. 168781402110027
Author(s):  
Byung Chul Kim ◽  
Ilhwan Song ◽  
Duhwan Mun
Keyword(s):  
Computer Aided Design ◽  
Feature Recognition ◽  
Practical Method ◽  
Numerical Control ◽  
Cnc Machine Tools ◽  
Cnc Machine ◽  
Jet Engine ◽  
Computer Aided ◽  
Cad Models ◽  
Cam Model

Manufacturers of machine parts operate computerized numerical control (CNC) machine tools to produce parts precisely and accurately. They build computer-aided manufacturing (CAM) models using CAM software to generate code to control these machines from computer-aided design (CAD) models. However, creating a CAM model from CAD models is time-consuming, and is prone to errors because machining operations and their sequences are defined manually. To generate CAM models automatically, feature recognition methods have been studied for a long time. However, since the recognition range is limited, it is challenging to apply the feature recognition methods to parts having a complicated shape such as jet engine parts. Alternatively, this study proposes a practical method for the fast generation of a CAM model from CAD models using shape search. In the proposed method, when an operator selects one machining operation as a source machining operation, shapes having the same machining features are searched in the part, and the source machining operation is copied to the locations of the searched shapes. This is a semi-automatic method, but it can generate CAM models quickly and accurately when there are many identical shapes to be machined. In this study, we demonstrate the usefulness of the proposed method through experiments on an engine block and a jet engine compressor case.

An oriented feature extraction and recognition approach for concave-convex mixed interacting features in cast-then-machined parts

2018 ◽  
Vol 233 (4) ◽  
pp. 1269-1288 ◽  
Author(s):  
Haichao Wang ◽  
Jie Zhang ◽  
Xiaolong Zhang ◽  
Changwei Ren ◽  
Xiaoxi Wang ◽  
...  
Keyword(s):  
Feature Extraction ◽  
Computer Aided Design ◽  
Feature Recognition ◽  
Freeform Surface ◽  
Layer By Layer ◽  
Computer Aided Process Planning ◽  
Computer Aided ◽  
Machined Parts ◽  
Aided Design ◽  
Interacting Features

Feature recognition is an important technology of computer-aided design/computer-aided engineering/computer-aided process planning/computer-aided manufacturing integration in cast-then-machined part manufacturing. Graph-based approach is one of the most popular feature recognition methods; however, it cannot still solve concave-convex mixed interacting feature recognition problem, which is a common problem in feature recognition of cast-then-machined parts. In this study, an oriented feature extraction and recognition approach is proposed for concave-convex mixed interacting features. The method first extracts predefined features directionally according to the rules generated from attributed adjacency graphs–based feature library and peels off them from part model layer by layer. Sub-features in an interacting feature are associated via hints and organized as a feature tree. The time cost is reduced to less than [Formula: see text] by eliminating subgraph isomorphism and matching operations. Oriented feature extraction and recognition approach recognizes non-freeform-surface features directionally regardless of the part structure. Hence, its application scope can be extended to multiple kinds of non-freeform-surface parts by customizing. Based on our findings, implementations on prismatic, plate, fork, axlebox, linkage, and cast-then-machined parts prove that the proposed approach is applicable on non-freeform-surface parts and effectively recognize concave-convex mixed interacting feature in various mechanical parts.

A GIS-Based Analysis on the Characteristics of Ancient Architectures in Taizhou, Zhejiang Province, China

2012 ◽  
Vol 446-449 ◽  
pp. 3529-3533
Author(s):  
Ruo Qi Xu ◽  
Hua Peng ◽  
Deng Rong Zhang ◽  
Chu Dong Huang ◽  
Ying Hao Li ◽  
...  
Keyword(s):  
Information System ◽  
Geographic Information System ◽  
Computer Aided Design ◽  
Building Materials ◽  
Geographic Information ◽  
Zhejiang Province ◽  
Construction Time ◽  
Computer Aided ◽  
Types Of Information ◽  
Aided Design

Ancient architectures have always been of great interest to a variety of studies. In this analysis, the distribution of ancient architectures in Taizhou, Zhejiang Province is investigated. In each area of the distribution, the characteristic of the ancient architectures are recorded, such as story number, building materials, construction time, etc. The various types of information are then input into a GIS (Geographic Information System) database, which also contains some typical images of the ancient architectures. Some of the data are from GoogleEarth or archived CAD (Computer Aided Design) files. Consequently, the distribution and characteristic of ancient architectures are analyzed consulting the GIS map and attribute table. Although the ancient architectures are similar in Taizhou, Zhejiang Province, there exist some notable differences. The commonness and differences would be significative for the preservation and planning for ancient architectures.

APPROACHES FOR THE DEVELOPMENT OF FOR AUTOMATED DESIGN AND SIMULATION OF ONBOARD NETWORKS

2021 ◽  
Vol 4 (30) ◽  
pp. 76-86
Author(s):  
V. L. Olenev ◽  
◽  
A. V. Shakhomirov ◽  
Keyword(s):  
Computer Aided Design ◽  
Aerospace Industry ◽  
Automated Design ◽  
Software Product ◽  
Computer Aided ◽  
Aided Design ◽  
New Generation ◽  
New Industry ◽  
Board Networks ◽  
Development Prospects

The article presents an analysis of the development prospects for the aerospace industry in relation to on-board systems and new-generation networks. It also presents the approaches for developing the SANDS software, intended for computer-aided design and simulation of on-board networks. Various approaches are described that will allow the existing software product to be refined and updated to meet new industry demands.

Late Ozu: New Generation and New Salaryman Film

2017 ◽  
Author(s):  
Woojeong Joo
Keyword(s):  
Middle Class ◽  
Everyday Life ◽  
Film Industry ◽  
Class Consciousness ◽  
New Wave ◽  
Generational Conflict ◽  
Critical Perspective ◽  
Commodity Culture ◽  
Good Morning ◽  
New Generation

This chapter covers the last years of Ozu’s career in the late 1950s and early 1960s, when Shochiku and the director himself were confronted by the younger generation’s challenge to established styles of everyday realism. The first part discusses the contextual basis of this change, from economic recuperation of postwar Japanese society, to the new wave of film industry, as epitomised by the boom of Nikkatsu’s Sun tribe films and the appearance of television. It is suggested that Ozu, though adopting certain aspects of the new changes, essentially maintained his styles and subject matters of urban everyday life and generational conflict, albeit with lesser critical perspective. This can be reflected in his ‘new salaryman films’ of this era, a genre that inherits the middle-classness of the shōshimin film, but with a brighter tone as to class consciousness, anticipating the appearance of television hōmudorama (home drama) genre. In the second part, such new salaryman films as Good Morning (1959) and An Autumn Afternoon (1962), are critically analysed, in terms of their active acknowledgement of new commodity culture and the ensuing banality of middle class everyday life.

Rocha, Glauber (1939–1981)

2018 ◽  
Author(s):  
Peter Baker
Keyword(s):  
New Wave ◽  
Brazilian Cinema ◽  
French New Wave ◽  
Revolutionary Violence ◽  
New Type ◽  
1960S And 1970S ◽  
Brazilian Film ◽  
The 1960S ◽  
New Generation ◽  
Film Critic

Glauber Rocha de Andrade (Vitória da Conquista, 1939–1981) was a Brazilian film critic, screenwriter, producer, and director. Arguably the most important director of the cinema nôvo (New Cinema) movement of the 1960s and 1970s, he began his career as a film critic, writing for well-known Brazilian journals about Italian neorealism and the French New Wave – two crucial influences on his own work. His writings criticized Brazil's commercial cinema and called for a new type of film that would represent the reality of Brazilian life. His most famous essay in this regard is "Estética da Fome" ("An Esthetic of Hunger," 1965). The essay reflects on the neo-colonial condition of Brazilian cinema through the analogy of the starvation of the Brazilian people and the intellectual starvation of its cinematic tradition; anti-colonial revolutionary violence is the only possible solution to these plights. This theoretical viewpoint is reflected in his Deu e o Diabo na Terra do Sol (Black God, White Devil, 1964), a film which earned him recognition on the international scene and in Brazil as the unchallenged leader of a new generation.

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