Encoding 3D correlation in an optical processor

Nicolás, Josep; Iemmi, Claudio; Campos, Juan; Yzuel, María Josefa

doi:10.1016/j.optcom.2005.07.037

Cited by 2 publications

(1 citation statement)

References 18 publications

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“…The colour distribution of polychromatic objects is introduced as a third dimension in addition to the 2D spatial variables. The technique can be optically implemented by encoding the 3D functions in 2D signals, either by interlacing the channels of the colour images [77] or by putting them side by side [78].…”

Section: Polychromatic 3d Pattern Recognitionmentioning

confidence: 99%

Advanced optical correlation and digital methods for pattern matching—50th anniversary of Vander Lugt matched filter

Millán¹

2012

J. Opt.

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On the verge of the 50th anniversary of Vander Lugt's formulation for pattern matching based on matched filtering and optical correlation, we acknowledge the very intense research activity developed in the field of correlation-based pattern recognition during this period of time. The paper reviews some domains that appeared as emerging fields in the last years of the 20th century and have been developed later on in the 21st century. Such is the case of three-dimensional (3D) object recognition, biometric pattern matching, optical security and hybrid optical-digital processors. 3D object recognition is a challenging case of multidimensional image recognition because of its implications in the recognition of real-world objects independent of their perspective. Biometric recognition is essentially pattern recognition for which the personal identification is based on the authentication of a specific physiological characteristic possessed by the subject (e.g. fingerprint, face, iris, retina, and multifactor combinations). Biometric recognition often appears combined with encryption-decryption processes to secure information. The optical implementations of correlation-based pattern recognition processes still rely on the 4f-correlator, the joint transform correlator, or some of their variants. But the many applications developed in the field have been pushing the systems for a continuous improvement of their architectures and algorithms, thus leading towards merged optical-digital solutions.

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Section: Polychromatic 3d Pattern Recognitionmentioning

confidence: 99%

Advanced optical correlation and digital methods for pattern matching—50th anniversary of Vander Lugt matched filter

Millán¹

2012

J. Opt.

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Chromatic discrimination by use of computer controlled set of light-emitting diodes

Kamshilin¹,

Nippolainen²

2007

Opt. Express

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We propose a novel approach for measurements of two-dimensional distribution of the reflection spectra with high spatial resolution. It is based on a subspace vector model of surface reflections and includes sequential illumination of the object by basis functions preliminary calculated with principal component analysis. A simple optical system consisting of a computer controlled set of light-emitting diodes and a photo-receiver operating in integration regime is used to acquire spatial distribution of reflection spectra in compressed form. The compressed data can be directly used for accurate color classification or recognition. The system's ability to distinguish metameric samples with extremely small hue difference is experimentally demonstrated.

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Encoding 3D correlation in an optical processor

Cited by 2 publications

References 18 publications

Advanced optical correlation and digital methods for pattern matching—50th anniversary of Vander Lugt matched filter

Advanced optical correlation and digital methods for pattern matching—50th anniversary of Vander Lugt matched filter

Chromatic discrimination by use of computer controlled set of light-emitting diodes

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