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This paper describes a study aimed at comparing the real image sensor noise distribution to the models of noise often assumed in image denoising designs. Quantile analysis in pixel, wavelet, and variance stabilization domains reveal that the tails of Poisson, signal-dependent Gaussian, and Poisson-Gaussian models are too short to capture real sensor noise behavior. Noise model mismatch would likely...
Existing tone mapping operators (TMOs) provide good results in well-lit scenes, but often perform poorly on im-ages in low light conditions. In these scenes, noise is prevalent and gets amplified by TMOs, as they confuse contrast created by noise with contrast created by the scene. This paper presents a principled approach to produce tone mapped images with less visible noise. For this purpose, we...
Many vision and augmented reality applications require knowing the rotation of the camera relative to an object or scene. In this paper we propose to create a structured light field designed explicitly to simplify the estimation of camera rotation. The light field is created using a lenticular sheet with a color coded backplane pattern, creating a lightfield where the observed color depends on the...
Image-based tracking technologies are popular in the behavioral research of zebrafish. The moving trajectory of a zebrafish is derived from the raw videos and the behavior of the zebrafish can be characterized from the moving trajectory. The speed is a common index in characterizing the trajectory of a zebrafish. However, if the trajectory is directly differentiated over time to calculate the instantaneous...
This paper addresses the problem of relative transfer function (RTF) estimation in the presence of stationary noise. We propose an RTF identification method based on segmental power spectral density (PSD) matrix subtraction. First multiple channel microphone signals are divided into segments corresponding to speech-plus-noise activity and noise-only. Then, the subtraction of two segmental PSD matrices...
CMOS camera expose different portions of the frame at different points in time, resulting in the so-called rolling shutter effect that bright and dark region of striation moving in the movie vertically. In this paper, we propose an image processing technique using global wave analysis and develop a general compensation algorithm to handle this problem. Researches in this area aggregated in geometric...
Both consumer market and manufacturing industry makes heavy use of 1D (linear) barcodes. From helping the visually impaired to identifying the products to industrial automated industry management, barcodes are the prevalent source of item tracing technology. Because of this ubiquitous use, in recent years, many algorithms have been proposed targeting barcode decoding from high-accessibility devices...
Localization of audio sources is an important research problem, e.g., to facilitate noise reduction. In the recent years, the problem has been tackled using distributed microphone arrays (DMA). A common approach is to apply direction-of-arrival (DOA) estimation on each array (denoted as nodes), and then map the DOA estimates to a location. In practice, however, the individual nodes contain few microphones,...
When establishing object correspondence across non-overlapping cameras, the existing methods combine separate likelihoods of appearance and kinematic features in a Bayesian framework, constructing a joint likelihood to compute the probability of re-detection. A drawback of these methods is not having a proper approach to reduce the search space when localizing an object in a subsequent camera once...
Image Fusion is used to integrate multiple images into a composite image, which contains complementary information from each of the source images. In defense applications, fusion is widely employed to obtain images pertaining to the object under surveillance and also for mapping terrain for navigation purposes. Surveillance imaging generally use two imaging sources, one an Infra Red (IR) camera and...
We propose a new method to fill missing or invalid values in depth images generated from the Kinect depth sensor. To fill the missing depth values, we use a robust least median of squares (LMedS) approach. We apply our method for telepresence environments, where Kinects are used very often for reconstructing the captured scene in 3D. We introduce a modified 1D LMedS approach for efficient traversal...
We present spatially-multiplexed fiducial markers with the framework of code division multiple access (CDMA), which is a technique in the field of communications. Since CDMA based multiplexing is robust to signal noise and interference, multiplexed markers can be demultiplexed under several image noises and transformation. With this framework, we explore the paradigm of multiple-input and multiple-output...
The study of atmospheric emissions like Airglow, Aurora etc, are essential to understand the theory and behavior of atmosphere. The Compact Airglow photometer (CAP) is one of the Fabry-Perot (FP) etalon based optical instruments which is capable of detecting the faint airglow emissions from sky in the presence of bright background light (which may be Sun or moon light). This is achieved by capturing...
Surveillance is the monitoring of the behavior, activities, or other changing information, usually of people for the purpose of influencing, managing, directing, or protecting them. As security is becoming the primary concern of society and hence having a security system is becoming a big requirement. Video surveillance plays a vital role in security systems. This paper describes the ability to recognise...
We address the problem of motion blur removal using a computational camera with a fluttering shutter. While there are several prototype flutter shutter cameras, and many scenarios in which motion blur is problematic, there are few real-world uses of flutter shutter cameras due to two important limitations. The first is that the shutter mechanisms used to date - primarily Liquid Crystal Display (LCD)...
In many circumstances the limitation for use of video cameras is energy. The energy needed for compression and transmission of video is substantial, and is linear with the number of transmitted frames. Time-lapse photography, a drastic reduction of transmitted frame rate, is an obvious solution, say by transmitting one frame every several minutes. The temporal resolution of the video is lost. Can...
LDOs are useful since LDOs do not generate switching noise, while synchronous DC-DC buck converters do. Because of this advantage, it is easy for designers to ignore the importance of the system-level PCB layout design. To control EMI at the output terminal of an LDO, the proper PCB layout is essential. This paper evaluates two types of power trace layouts for LDO test benches with a 10-layer stack-up...
In this paper, we propose a new visual inspection method that can analyze the exterior surface of rubber tires with the light stripe projection. Image sensing of the tire surface was implemented by setting the tire on the rotating table so that the normal pattern of the tire surface could be suppressed. The proposed method detects the exterior thin defect after removing three kinds of uneven circularities...
The paper presents a unified framework that aims at stabilization of real time images captured from a photosensitive sensor mounted on any mobile platform. Typically the real time images obtained from a mobile platform are prone to suffer from unwanted stray noise, presence of jitter, camera distortions which lead to suppression of finer details and thus make extraction of required information about...
Depth estimation is one of the new functions provided by hand-held light field cameras. However, the quality of depth estimation is very sensitive to noise, which is especially a problem for scenes under low light conditions. In this paper, we propose a depth estimation flow for light field data, which can be fully-automated and no noise characteristics are required a priori. The results of Root Mean...
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