Introductory Chapter: Electromagnetism

Yeap, Kim Ho; Hirasawa, Kazuhiro

doi:10.5772/intechopen.85155

Cited by 8 publications

(12 citation statements)

References 21 publications

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“…Before we discuss in detail our approach, we will present the concepts of chromatics aberration [8][9], this is followed by our approach to image correction. Eq.…”

Section: Chromatic Aberrationmentioning

confidence: 99%

Self-image correction for low-cost imaging optic

Wang

Whitaker

2023

ETN

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With the advent of computing power and higher resolution CMOS sensor, imaging camera for mobile phone application has become very common in consumer portable product such as mobile phone, tablet or even wearable devices and head mount devices . Higher resolution image sensor, on the other hand, will suffer chromatic aberration (CA) where the colour channel appears shifted. Better lens design with more lens elements may be required. However, this will add more cost and manufacturing challenges. Many studies and methods have been proposed for CA correction through post image processing and those methods required calibration or post image process before correction factor can be applied. In this paper, we propose a new algorithm that will pre-defined the CA correction factor through lens design simulation.

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“…Before we discuss in detail our approach, we will present the concepts of chromatics aberration [8][9], this is followed by our approach to image correction. Eq.…”

Section: Chromatic Aberrationmentioning

confidence: 99%

Self-image correction for low-cost imaging optic

Wang

Whitaker

2023

ETN

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“…The electric field does not have to be moving to produce a magnetic field; if the charge of the electric field is fluctuating then a fluctuating magnetic field will be induced. Due to their coupled nature, if the correct balance is achieved, the fields can sustain each other and once sustained, an electromagnetic field emits directional electromagnetic waves as the fields fluctuate [ 6 ].…”

Section: Electromagnetic Fieldsmentioning

confidence: 99%

Applications of Microwave Energy in Medicine

Gartshore

Kidd²,

Joshi

2021

Biosensors

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Microwaves are a highly utilized electromagnetic wave, used across a range of industries including food processing, communications, in the development of novel medical treatments and biosensor diagnostics. Microwaves have known thermal interactions and theorized non-thermal interactions with living matter; however, there is significant debate as to the mechanisms of action behind these interactions and the potential benefits and limitations of their use. This review summarizes the current knowledge surrounding the implementation of microwave technologies within the medical industry.

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“…Since the index of refraction n of the lens material varies as a function of wavelength, dispersion occurs when electromagnetic waves of different frequencies propagate through the lens. The visible light spectrum, which ranges from 400 to 790 THz (or 380–750 nm in wavelengths), 1 can be decomposed into seven constituent colors—namely, red, orange, yellow, green, cyan, blue, and violet. These colors refract unevenly at different angles and, as a result, their focal points when passing through the lens vary.…”

Section: Introductionmentioning

confidence: 99%

A color correction method to minimize lateral chromatic aberration in spherical lens stacks

Goh,

Yeap,

Dakulagi

et al. 2024

Micro & Optical Tech Letters

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Despite its propensity in experiencing chromatic aberration, spherical lenses have been popularly used in imaging lens systems. To ameliorate its performance, we propose a novel method to alleviate the level of chromatic aberration in spherical lenses. In our method, a predefined correction factor is generated from the design simulation, and it is then used to correct the lateral chromatic aberrations of the primary colors. By applying the proposed method to a spherical lens stack, the optical performance of the lens stack has achieved significant improvement. In our analysis, we demonstrate that the image quality achieved from a spherical lens stack can be comparable, if not better than that from an aspheric lens stack. It is worthwhile noting that this correction method can be achieved without the need to go through the tedious long process of post‐image analysis and calibration.

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Introductory Chapter: Electromagnetism

Cited by 8 publications

References 21 publications

Self-image correction for low-cost imaging optic

Self-image correction for low-cost imaging optic

Applications of Microwave Energy in Medicine

A color correction method to minimize lateral chromatic aberration in spherical lens stacks

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