Thresholds were measured for detecting spatial luminance modulation in regular lattices of visually discrete dots. Thresholds for modulation of a lattice are generally higher than the corresponding threshold for modulation of a continuous field, and the size of the threshold elevation, which depends on the spacing of the lattice elements, can be as large as a one log unit. The largest threshold...

This paper presents results of a mobile robot qualitative self-localisation experiment using information from cast shadows. Shadow detection was accomplished by mapping the images from the robot’s monocular colour camera into a HSV colour space and then thresholding on V. We present results of self-localisation using two methods for obtaining the threshold automatically: in one method the image...

We discuss the prediction of the sample variance of marks of a marked spatial point process on a continuous space by the threshold method. The threshold method is a statistical prediction using only the number of points with marks exceeding a given threshold value. Mase (1996) considered the method in the framework of spatial point processes on a discrete space and Sakaguchi and Mase (2003) ext...

Due to unsatisfactory segmentation results when images contain noise by the Otsu’s thresholding method. Two-dimensional (2D) and three-dimensional (3D) Otsu’s methods thus were proposed. These methods utilize not only grey levels of pixels but also their spatial informations between pixels such as mean and median values. The 3D Otsu’s methods additionally use both kinds of spatial information w...

We consider the effects of parametric perturbation on the onset of chaos in different dynamical systems. Favoring or suppression of chaos was observed depending on the phase or the frequency of the periodic perturbation. A lowering of the threshold of chaos was observed in an electronic device simulating a Josephson-Junction model and the suppression of chaos was obtained in a bistable mechanic...

In this paper, the modeling and evaluation of multibank SRAM design with dynamic threshold and supply voltage control is presented to reduce leakage power. The bank of SRAM, the unit of control, is put in sleep mode (high threshold voltage and low supply voltage) from active mode (low threshold voltage and high supply voltage) whenever it is not frequently used. The change of modes is based on ...

The technique of spatial modulating (“jittering”) an existing or newly created auditory alert along a virtual trajectory to improve its detection in a noisy environment is described. Threshold data from 14 participants were gathered as a function of spatial modulation rate (0, 1.6 and 3.3 Hz) of an avionics “wind sheer” alert (two successive 300 ms square waves) against a steady state backgroun...

The objectives of the study were to (1) investigate the potential of using monopolar psychophysical detection thresholds for estimating spatial selectivity of neural excitation with cochlear implants and to (2) examine the effect of site removal on speech recognition based on the threshold measure. Detection thresholds were measured in Cochlear Nucleus® device users using monopolar stimulation ...

Figure 2: (left) Color-coded principal eigenvectors diagrams showing the local direction of maximal diffusion in eight central slices calculated from the acquired DTI data. The diagrams are fused with corresponding anatomical images (b0-images). For calculation, a FA threshold of 0.25 and a background removal threshold of 100 were used. (right) Tractography of the same kidney as shown in Figure...

OBJECTIVES To investigate (1) the effects of loss of vestibular function on spatiotemporal vision and (2) the mechanisms which enable labyrinthine defective (LD) patients to adapt to oscillopsia. METHODS Visual function and eye movements were assessed in seven normal subjects and four LD patients with oscillopsia due to absent vestibulo-ocular reflex. Temporal vision was assessed by measureme...