Compensation Of Chromatic Aberrations Research Articles

A Study on the Application of Visual Perception in Art Design Based on Industrial Mathematics Models

To study the beautification of art design and analyze the application of visual perception in art design, this paper proposes an image beautification processing technique based on multiple chromatic aberration compensation of illumination. The paper will then investigate the task of classifying styles, genres, and artists based on deep learning methods on fine art design images. The proposed method automatically classifies fine art design images with significant improvements in classification accuracy and efficiency. Experimental tests are conducted and the results show that the beautification of night images using this technique has good fine art presentation capabilities, improves the aesthetic and visual sensory expressive performance of the images, and has good fine art application value.

Longitudinal chromatic aberration compensation method for dual-wavelength retinal imaging adaptive optics systems

The predecessor of China Optics was China Optics and Applied Optics Digest, which was founded in 1985. At that time, it was the only retrieval journal in the field of optics in China. At the end of 2008, China Optics and Applied Optics Digest was renamed

Using Color Difference Compensation Method to Balance and Repair the Image of Art Design

In the case of complex illumination background, the image has fuzziness and chromatic aberration, which can improve the imaging effect of the image by white balance chromatic aberration compensation. The traditional method uses the contour feature fusion adaptive matching method to compensate the white balance under the complex illumination background, which leads to the good color difference compensation effect when the image pixel is low. A white balance color compensation algorithm for fuzzy chromatic aberration based on wavelet packet decomposition is proposed. The original image was denoised and filtered. The white balance characteristics of the image were analyzed and extracted based on the wavelet packet decomposition method, and the adaptive balance design was carried out to realize the white balance and color difference compensation of the art design chromatic aberration image. By using the known pixel information of the image block to be repaired, the statistical properties of the image block to be repaired are predicted, and the matching cost of the image block to be matched that meets the restriction conditions is calculated. By introducing the objective factor, the matching cost function is improved to balance the restoration process, and the unnatural problem caused by the repeated appearance of some image details in the restoration results is solved. The simulation results show that the method can effectively balance the color difference of the image, improve the aesthetic feeling of the image, and improve the performance of the detail features of the image. The peak signal-to-noise ratio is high.

Stepped Frequency Multiresolution Digital Signal Processing

With the rapid development of radar industry technology, the corresponding signal processing technology becomes more and more complex. For the radar with short-range detection function, its corresponding signal mostly presents the characteristics of wide bandwidth and multiresolution. In the traditional data processing process, a large number of signals will interfere with the signal, which makes the final signal processing difficult or even impossible. Based on this problem, this paper proposes a principal component linear prediction processing algorithm based on clutter suppression processing on the basis of traditional signal processing algorithm. According to the curve characteristics of the data returned by the target detected by the signal, through certain image signal measurement and transformation, the clutter can be effectively suppressed and the typical characteristics of the corresponding target curve can be enhanced. For the convergence problem of signal processing and the corresponding image chromatic aberration compensation problem, this paper will realize the chromatic aberration compensation of the corresponding target echo image based on the radial pointing transverse mode algorithm and enhance the convergence speed of the whole algorithm system. In the experimental part of this paper, the optimization algorithm proposed in this paper is compared with the traditional algorithm. The experimental results show that the algorithm proposed in this paper has obvious advantages in the convergence of signal processing and antijamming performance and has the promotion value.

Holographic Waveguide Periscopes in Augmented Reality Displays

Main properties of holographic waveguide periscopic multiplexors of the exit pupil of optical systems of augmented reality displays are considered. Limitations in the operation of waveguide holograms, compensation of chromatic aberrations in periscopic schemes, and influence of waveguide defects on the operation of augmented reality displays constructed based on waveguide holograms are analyzed.

Tunable GST metasurfaces for chromatic aberration compensation in the mid-infrared

Abstract Metasurfaces for chromatic aberration compensation have attracted a lot of research attentions since almost all imaging systems suffer from the intrinsic dispersion of composite materials and the chromatic aberration. However, most of them rely on complicated optimization of the structural parameters, hindering their practical application. Here we proposed a new and simple scheme of metasurface for chromatic aberration compensation based on phase change materials. As a demonstration, Ge2Sb2Te5(GST) is used to design metalens and deflector with reduced chromatic aberration that works over a broad band of wavelengths. Simulation results show that we can simply reduce the chromatic aberration fromλ = 8 μm to λ = 9 μm via uniformly tuning the crystalline fraction of GST. In addition, we demonstrate that the working wavelength can be extended to a wider range fromλ = 8 μm to λ = 11 μm via individually engineering the crystalline fraction of each GST cylinder. Our metadevice serves as a novel paradigm for mid-infrared devices with compensated chromatic aberration, enabling a wide variety of application.

Simultaneous dual-wavelength digital holographic microscopy with compensation of chromatic aberration for accurate surface characterization.

In this paper, a simultaneous dual-wavelength digital holographic microscope with compensation of chromatic aberration is presented. The microscope has been used to calibrate two standard step heights of 1340 and 1000 nm. The extracted results have been compared with those extracted by the single-shot, dual-wavelength digital holographic microscope, and the comparison has shown that measurements by the proposed microscope are more accurate by around 40 nm. We claim that the high accuracy in measurement is due to the fact that the proposed system works in real time with very low chromatic aberration. Judging the performance of the measurement process over time is explained by the control charts. Evidence from the control measurements sets a probable limit on precision for this process at about 3σ=3.5 nm.

Research on grating surface microstructure for the chromatic aberration compensation in infrared band

At present, there are problems of large wavelength span and large system volume for the chromatic aberration correction in the infrared band, which is harmful to the miniaturization of the optical system, while, there are problems of low design freedom and low selectivity for the optical material. We designed a grating surface microstructure for infrared chromatic aberration correction. By analyzing the chromatic aberration correction of two common infrared wavebands of 4.8 μm and 10.6 μm, we focused on grating microstructure design. Taking the infrared chromatic aberration of the ZnSe lens as an example, the scattering surfaces of the two kinds of grating cell structures were simulated by FDTD method. The simulation results show that the single square cylinder grating microstructure performed a phase retardation of 1.4π at 4.8 μm and 0.7π at 10.6 μm, as a result the compensation effect was not good. While, the phase retardation of double square cylinders grating microstructure at 4.8 μm was 1.5π, and the all-phase modulation for range of 0–2π at 10.6 μm waveband had been achieved, which is suitable for infrared chromatic aberration compensation. The geometric parameters of the double square cylinders microstructure were designed to be L1 = 400 nm, L2 = 950 nm and K = 500 nm. Fabricate double square cylinders grating microstructure sample on the germanium substrate by the standard semiconductor fabrication technology. Profiler tested the structure parameters, and the results were shown as: L1 = 408 nm, L2 = 944 nm, and the height of the square cylinder is K = 495.32 nm, surface roughness is 16.32 nm; the peak transmissivities of two infrared bands for 4.7–4.9 μm and 10.5–10.7 μm were reached 65% and 62%; the test light path of longitudinal chromatic aberration was established by using the principle of parallel light measuring longitudinal chromatic aberration. After adding sample, the longitudinal chromatic aberration for the infrared waves were reduced by 55%, which proved the effect of the micro-nano structure device on the chromatic aberration correction in infrared band. Compared with traditional lens gluing and other technologies, this technology has the advantages of light weight, small size, high design freedom and good effect on chromatic aberration correction.

Multimodal label-free ex vivo imaging using a dual-wavelength microscope with axial chromatic aberration compensation.

Label-free microscopy is a very powerful technique that can be applied to study samples with no need for exogenous fluorescent probes, keeping the main benefits of multiphoton microscopy, such as longer penetration depths and intrinsic optical sectioning while enabling serial multitechniques examinations on the same specimen. Among the many label-free microscopy methods, harmonic generation (HG) is one of the most intriguing methods due to its generally low photo-toxicity and relative ease of implementation. Today, HG and common two-photon microscopy (TPM) are well-established techniques, and are routinely used in several research fields. However, they require a significant amount of fine-tuning to be fully exploited, making them quite difficult to perform in parallel. Here, we present our designed multimodal microscope, capable of performing simultaneously TPM and HG without any kind of compromise thanks to two, separate, individually optimized laser sources with axial chromatic aberration compensation. We also apply our setup to the examination of a plethora of ex vivo samples to prove its capabilities and the significant advantages of a multimodal approach.

Ultrahigh resolution retinal imaging by visible light OCT with longitudinal achromatization.

Chromatic aberrations are an important design consideration in high resolution, high bandwidth, refractive imaging systems that use visible light. Here, we present a fiber-based spectral/Fourier domain, visible light OCT ophthalmoscope corrected for the average longitudinal chromatic aberration (LCA) of the human eye. Analysis of complex speckles from in vivo retinal images showed that achromatization resulted in a speckle autocorrelation function that was ~20% narrower in the axial direction, but unchanged in the transverse direction. In images from the improved, achromatized system, the separation between Bruch's membrane (BM), the retinal pigment epithelium (RPE), and the outer segment tips clearly emerged across the entire 6.5 mm field-of-view, enabling segmentation and morphometry of BM and the RPE in a human subject. Finally, cross-sectional images depicted distinct inner retinal layers with high resolution. Thus, with chromatic aberration compensation, visible light OCT can achieve volume resolutions and retinal image quality that matches or exceeds ultrahigh resolution near-infrared OCT systems with no monochromatic aberration compensation.

Chromatic aberration compensation in numerical reconstruction of digital holograms by Fresnel-Bluestein propagation.

In this Letter, we present a method for chromatic compensation in numerical reconstruction of digitally recorded holograms based on Fresnel-Bluestein propagation. The proposed technique is applied to correct the chromatic aberration that arises in the reconstruction of RGB holograms of both millimeter- and micrometer-sized objects. The results show the feasibility of this strategy to remove the wavelength dependence of the size of the numerically propagated wavefields.

P‐142: A Method of Chromatic Aberration Compensation in Holography by using Fourier Transform Principle

In this paper, we propose a method to compensate chromatic aberration by using Fourier transform principle. We adjust the size of the reconstructed images to compensate magnification chromatic aberration according to the similarity principle of Fourier transform, and adjust the center positions of the reconstructed images with the shift principle to solve the coincidence problem of the reconstructed images.

一种基于液体透镜的全息色差补偿方法

一种基于液体透镜的全息色差补偿方法

基于数字透镜区域采样的计算全息色差补偿方法

基于数字透镜区域采样的计算全息色差补偿方法

A method of chromatic aberration compensation in holographic projection display based on a single spatial light modulator

AbstractIn this paper, we propose a method of chromatic aberration compensation in holographic projection display based on a single spatial light modulator (SLM). By combining the hologram of the object with that of the digital lens, three color holograms with different focal lengths can be generated. Then, the SLM is divided into three parts, input three color holograms with different focal lengths to the SLM, and each occupies one‐third area of the SLM. We verify our method, and the results show its feasibility.

Double phase-plate setup for chromatic aberration compensation for resonant x-ray diffraction experiments

An x-ray phase plate that can generate arbitrary states of linearly polarized x-rays is an indispensable device in recent resonant x-ray diffraction experiments. A thick phase plate, which is necessary to produce a high degree of linear polarization, however, considerably reduces incident x-ray intensity, particularly for low energy x-rays. Degradation of linear polarization chiefly arises from the finite energy width of incident x-rays in recent synchrotron sources, and hence we have equipped a double phase-plate setup for chromatic aberration compensation using two thin phase plates. The total linear polarization 90.5% for a single phase plate of 0.5 mm thickness was remarkably improved to 96.8% by using two phase plates of about 0.3 mm thickness at 6.1236 keV; a high degree of linear polarization was achieved without additional loss of intensity.

Dynamic compensation of chromatic aberration in a programmable diffractive lens

A proposal to dynamically compensate chromatic aberration of a programmable phase Fresnel lens displayed on a liquid crystal device and working under broadband illumination is presented. It is based on time multiplexing a set of lenses, designed with a common focal length for different wavelengths, and a tunable spectral filter that makes each sublens work almost monochromatically. Both the tunable filter and the sublens displayed by the spatial light modulator are synchronized. The whole set of sublenses are displayed within the integration time of the sensor. As a result the central order focalization has a unique location at the focal plane and it is common for all selected wavelengths. Transversal chromatic aberration of the polychromatic point spread function is reduced by properly adjusting the pupil size of each sublens. Longitudinal chromatic aberration is compensated by making depth of focus curves coincident for the selected wavelengths. Experimental results are in very good agreement with theory.

Performance of an energy-compensated three-dimensional atom probe

A wide acceptance angle first-order reflectron lens has been incorporated into a three-dimensional atom probe (3DAP) to provide improved mass resolution. This new 3DAP instrument is capable of resolving isotopes in the mass spectrum, with resolutions better than m/Δm=500 full width at half maximum and 250 full width at 10% maximum. However, use of a reflectron for energy compensation within an imaging system means that improvements in mass resolution result in degradation of the spatial resolution. This article addresses the detailed design of the energy compensated 3DAP, and the minimization and compensation of chromatic aberrations in the imaging performance of the instrument. Some applications of the new instrument are included to illustrate its capabilities in the atomic-scale analysis of engineering alloys.

New epi-fluorescence optical system for independent analysis of two different fluorochromes in microscopy.

A new epi-fluorescence optical system is described that uses splitting of the primary excitation and emission light beams, independent modification of the separated beams, and their reunification. The optical system was constructed for analysis of two different fluorochromes, e.g., DAPI and TRITC. Modifications in the separated beams comprise: (1) isolation of specific wavelengths (365 nm, 546 nm, 435-500 nm, and 590-750 nm), (2) wavelength switching without image displacement and blur by means of a light chopper alternating between ultraviolet-excitation/blue-detection and green-excitation/red-detection at frequencies of up to 140 Hz for observation by eye without image flicker, and (3) separate positioning of lenses for compensation of chromatic aberrations. This system demonstrates a good transmission of the chosen wavelengths. A high specificity of double fluorescence analysis with minimal effects of spectral overlap was obtained with good temporal resolution. It has been shown that it is feasable to obtain separate chromatic compensations for the use of a microscope objective in spectral regions outside the range for which the objective is corrected.

投影露光装置用ＴＴＬアライメント法 ２光束入射を用いて色収差を解決したＴＴＬアライメント

This paper presents a novel TTL (through the lens) alignment method, called SMART (separated marks TTL alignment), for optical lithography system. This alignment optical system could be accomplished without any complicated chromatic aberration compensation mechanisms. It was clarified that the relative displacement between the reticle and the wafer can be directly detected by measuring the intensity change from detector or the phase difference in the optical heterodyne beat signals. It is also demonstrated that the alignment signal is independent from the wafer focus variation, and can always be detected, even during exposure. An alignment signal stabilization method, in which part of the diffraction lights from the reticle marks are used as reference beat signal, has been adapted to obtain high positioning accuracy. As a result, alignment signal variation of less than ± 12 nm (0.012 μm) has been obtained.