Search results for "Gaussian blur"

showing 3 items of 3 documents

Optimal Filter Estimation for Lucas-Kanade Optical Flow

2012

Optical flow algorithms offer a way to estimate motion from a sequence of images. The computation of optical flow plays a key-role in several computer vision applications, including motion detection and segmentation, frame interpolation, three-dimensional scene reconstruction, robot navigation and video compression. In the case of gradient based optical flow implementation, the pre-filtering step plays a vital role, not only for accurate computation of optical flow, but also for the improvement of performance. Generally, in optical flow computation, filtering is used at the initial level on original input images and afterwards, the images are resized. In this paper, we propose an image filt…

Computer scienceGaussianComputingMethodologies_IMAGEPROCESSINGANDCOMPUTERVISIONOptical flowGaussian blurlcsh:Chemical technologyGaussian filteringcomputer.software_genreBiochemistryArticleAnalytical Chemistryoptical flowsymbols.namesakeLucas–Kanade methodoptical flow; Lucas-Kanade; Gaussian filtering; optimal filteringGaussian functionlcsh:TP1-1185SegmentationComputer visionLucas-KanadeElectrical and Electronic EngineeringInstrumentationbusiness.industryoptimal filteringMotion detectionFilter (signal processing)Atomic and Molecular Physics and OpticsComputer Science::Computer Vision and Pattern RecognitionsymbolsArtificial intelligenceData miningMotion interpolationbusinesscomputerData compressionSensors
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A blind Robust Image Watermarking Approach exploiting the DFT Magnitude

2019

Due to the current progress in Internet, digital contents (video, audio and images) are widely used. Distribution of multimedia contents is now faster and it allows for easy unauthorized reproduction of information. Digital watermarking came up while trying to solve this problem. Its main idea is to embed a watermark into a host digital content without affecting its quality. Moreover, watermarking can be used in several applications such as authentication, copy control, indexation, Copyright protection, etc. In this paper, we propose a blind robust image watermarking approach as a solution to the problem of copyright protection of digital images. The underlying concept of our method is to a…

FOS: Computer and information sciencesComputer Science - Cryptography and SecurityComputer sciencebusiness.industryComputer Vision and Pattern Recognition (cs.CV)Gaussian blurComputer Science - Computer Vision and Pattern RecognitionComputingMethodologies_IMAGEPROCESSINGANDCOMPUTERVISIONWatermarkFilter (signal processing)Discrete Fourier transformsymbols.namesakeDigital imageGaussian noisesymbolsDiscrete cosine transformComputer visionArtificial intelligencebusinessDigital watermarkingCryptography and Security (cs.CR)Histogram equalization
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Effect of Cycloplegia on Blur Perception Thresholds as Measured by Source Method

2017

Abstract One of the advantages of a source method over observer method in blur perception measurements is better control of a stimulus blur level, which is achieved with computerised image processing unlike the observer method that requires optical defocusing of the observer. The aim of this study was to determine if paralysation of accommodation has effect on blur perception thresholds, thereby evaluating its necessity in such experiments. Blur perception thresholds (just noticeable blur, clear image, recognition, and non-resolvable blur thresholds) were evaluated with (using cycloplegia) and without paralysed accommodation to determine effect on blur perception. A computerised low-pass sp…

source blurring methodMultidisciplinaryGeneral interestSciencemedia_common.quotation_subjectQCycloplegiablur perceptionblur adaptationgaussian blur filterPerceptionmedicineOptometrycycloplegiamedicine.symptomPsychologymedia_commonProceedings of the Latvian Academy of Sciences. Section B. Natural, Exact, and Applied Sciences.
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