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The article describes some questions of functioning of digital cameras with purpose to increase optical resolution of the photos. The presented work includes detailed analysis and comparison of options, possible for nowadays, of improvements of optical resolution. The first offered option — use of the software. In the second option use of other different filters instead of Bayer filter is considered...
Quality plays significant role to stay competitive in the market, especially in industries that many new products enter and leave themarket. The basic requirement is to ensure that only products meet the quality standards can be released, and this is possible by implementing high-quality inspection to sort the products. However, manual sorting of bulk items is very difficult due to a large number...
In this paper, a robust and efficient histogram based template matching method for automatic detection of Optic Disc (OD) in retinal images to help ophthalmologists for diagnosis of retinal diseases is presented. Based on camera field of view (FOV) and image resolution, the OD size estimation algorithm for creation of specific size templates is proposed. Color plane histograms of OD region were used...
The paper is focused on an 8k resolution on large panel generation in TFT-LCDs to detect its appearance, especially green color is the most sensitivity in human vision as well as ten million pixels resolution in the display. The experiment utilizes the machine vision associated with reflective chromaticity spectrometer to quantize the defects of the blackening and whitening onto green layer. A scientific...
Segmentation of optic disk (OD) is a very important step in automatic Diabetic Retinopathy screening. In this paper, we presented a robust and novel template matching algorithm for automatic detection of OD in retinal images. The size of OD area depends on camera field of view and image resolution. Based on these criteria we formulated and presented OD size estimation algorithm and it is used to create...
In 2015, according to the International Diabetes Federation (IDF), around 415 million of people worldwide lived with diabetes and it was predicted to be increased by 642 million of people in 2040. One of the diabetes complications that affect the retina is known as diabetic retinopathy (DR). It is indicated by the presence of hard exudates as the main pathology of DR. In retinal fundus images, hard...
Exudates are one of the abnormalities present on the retina which are used for identification of diseases like Diabetic Retinopathy and Macular Edema. There arises a need for automated and correct segmentation of exudates from digital fundus images. This paper proposes an automated computer vision technique for efficient exudates segmentation from fundus images. The proposed method segments the exudates...
I investigate the chromatic aberration of full-color optical scanning holography (OSH) and propose a digital filtering technique that compensates the chromatic aberration. The focal lengths and the extents of Red, Green and Blue (RGB) time-dependent Fresnel zone plates (TD-FZPs) which encode the RGB complex holograms depend on wavelengths of RGB beams. This generates chromatic aberration in full-color...
A fire smoke detection algorithm based on optical flow method and texture feature is proposed, which can be used for early fire alarm. It establishes the image of Pyramid, and uses LBP and LBPV to extract the static texture features of different levels. Due to the turbulence characteristic of the smoke motion, the smoke direction is consistent, and optical flow vector analysis is used to judge the...
Glaucoma and Diabetic Retinopathy are the leading common cause of vision loss. Optic Disc and macula are the important landmark for the detection of these retinal pathology. Even though, the manual screening of Optic Disc and macula are available, they consume more time and have more human error. Therefore, there is a need of an automated application for the reliable and efficient localization of...
This paper proposes a method to detect optic disk (OD) automatically in fundus image of retina without using background mask and blood vessels. Based on the properties of OD, an idea of curve operator is presented here. This method has been implemented on three public databases and the promising results are obtained. The experimental results indicate that this proposed method of automatic OD detection...
Automatic feature detection in retinal fundus images is a fundamental issue to diagnosis eye diseases such as Glaucoma. For example, Optic Disc (OD) is a main feature for diagnosing retinal fundus diseases such as Glaucoma. This paper presents a novel algorithm for OD detection in retinal fundus images based on region growing. Image thresholding based on the entropy of the input image histogram and...
Telemedicine system requires video support in which many key information of patients is included such as pulse motion and skin color changes. But those motion are too small to be well perceived by the naked eye. In this paper we proposed a video minor motion magnification system that can magnify the minor motion of pulse of neck and wrist and magnify the color changes of human skin in videos of patient...
Glaucoma is the major reason that causes blindness today. It results in total loss of vision which is irreparable which makes it mandatory to detect it at early stages. This paper proposes a simple method to evaluate the Cup-to-Disc Ratio (CDR) of a retinal fundus image to screen it for Glaucoma. It is a contrasting feature taken up to check whether the subject is at risk for Glaucoma or not. The...
We demonstrate optical cavity-embedded perovskite solar cells capable of creating transmissive colors that can be easily tuned by altering the spacer layer thickness in the cavity and simultaneously generating ∼4% of power conversion efficiency.
This paper describes a novel method of enhancing shallow ocean optical images or videos using a fast dark channel prior descattering method. Absorption, scattering and color distortion are three major distortion problems for underwater imaging. In this paper, we propose a novel shallow water imaging model to compensate for the attenuation discrepancy along the propagation path and an effective underwater...
Absorption, scattering, and color distortion are three major issues in underwater optical imaging. Light rays traveling through water are scattered and absorbed according to their wavelength. Scattering is caused by large suspended particles that degrade optical images captured underwater. Color distortion occurs because different wavelengths are attenuated to different degrees in water; consequently,...
The aim of this paper is to give a short overview of the methods that we have used in spectroscopy of microscopic images in order to improve perception and manipulation of small objects. The methodology itself is illustrated through several examples, together with short comments on related issues.
Optical Flow estimation is used to estimate displacement vectors for each pixels in two frames of a video. This displacement vector says how quickly a pixel is moving across the image and direction of movement of each pixel. According to the direction of movement, a color is assigned to each flow vector and intensity of color varies according to the magnitude of velocity. In this paper, optical flow...
We present a novel method of enhancing shallow ocean optical images or videos using weighted guided median filter and wavelength properties. Absorption, scattering and color distortion are three major distortion issues for underwater optical imaging. Light rays traveling through water are scattered and absorbed depending on the wavelength. Scattering is caused by large suspended particles, as in turbid...
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