scholarly journals Visual and non-visual contributions to perception of object movement during observer movement

2012 ◽  
Vol 12 (9) ◽  
pp. 240-240
Author(s):  
P. A. Warren ◽  
R. A. Champion ◽  
A. J. Foulkes ◽  
S. K. Rushton ◽  
T. C. A. Freeman
Keyword(s):  
Object Movement ◽  
Observer Movement

EFFECT OF OBSERVER MOVEMENT ON MONOCULAR DEPTH PERCEPTION

1967 ◽  
Vol 24 (3) ◽  
pp. 725-726 ◽  
Author(s):  
GORDON M. REDDING ◽  
ROY B. MEFFERD ◽  
BETTY A. WIELAND
Keyword(s):  
Depth Perception ◽  
Monocular Depth ◽  
Observer Movement

Orthopteran DCMD neuron: a reevaluation of responses to moving objects. II. Critical cues for detecting approaching objects

1992 ◽  
Vol 68 (5) ◽  
pp. 1667-1682 ◽  
Author(s):  
P. J. Simmons ◽  
F. C. Rind
Keyword(s):  
Moving Objects ◽  
Optic Lobe ◽  
Receptive Fields ◽  
Wide Field ◽  
Motion Detector ◽  
Dark Light ◽  
Subsequent Response ◽  
Object Movement ◽  
Line Movement ◽  
Important Stimulus

1. We examine the critical image cues that are used by the locust visual system for the descending contralateral motion detector (DCMD) neuron to distinguish approaching from receding objects. Images were controlled by computer and presented on an electrostatic monitor. 2. Changes in overall luminance elicited much smaller and briefer responses from the DCMD than objects that appeared to approach the eye. Although a decrease in overall luminance might boost the response to an approaching dark object, movement of edges of the image is more important. 3. When two pairs of lines, in a cross-hairs configuration, were moved apart and then together again, the DCMD showed no preference for divergence compared with convergence of edges. A directional response was obtained by either making the lines increase in extent during divergence and decrease in extent during convergence; or by continually increasing the velocity of line movement during divergence and decreasing velocity during convergence. 4. The DCMD consistently gave a larger response to growing than to shrinking solid rectangular images. An increase compared with a decrease in the extent of edge in an image is, therefore, an important cue for the directionality of the response. For single moving edges of fixed extent, the neuron gave the largest response to edges that subtended 15 degrees at the eye. 5. The DCMD was very sensitive to the amount by which an edge traveled between frames on the display screen, with the largest responses generated by 2.5 degrees of travel. This implies that the neurons in the optic lobe that drive this movement-detecting system have receptive fields of about the same extent as a single ommatidium. 6. For edges moving up to 250 degree/s, the excitation of the DCMD increases with velocity. The response to an edge moving at a constant velocity adapts rapidly, in a manner that depends on velocity. Movement over one part of the retina can adapt the subsequent response to movement over another part of the retina. 7. For the DCMD to track and continue to respond to the image of an approaching object, the edges of the image must continually increase in velocity. This is the second important stimulus cue. 8. Edges of opposite contrasts (light-dark compared with dark-light) are processed in separate pathways that inhibit each other. This would contribute to the reduction of responses to wide-field movements.

Compensation for Auditory Re-Arrangement in the Absence of Observer Movement

1967 ◽  
Vol 24 (2) ◽  
pp. 475-478 ◽  
Author(s):  
Ronald Kalil ◽  
Sanford J. Freedman
Keyword(s):  
Sound Source ◽  
Adaptive Compensation ◽  
Observer Movement

Ss wearing a pseudophone which produced functional rotation of the interaural axis sat motionless watching a sound-source move in an arc in front of their bodies. After short exposures, significant adaptive compensation for this auditory re-arrangement was measured. An interpretation is suggested in terms of the resolution of intersensory discordance.

scholarly journals PENERAPAN GRABBER PADA OPTICAL FLOW UNTUK MENGGERAKKAN CURSOR MOUSE MENGGUNAKAN BOLPOIN

Compiler ◽  
2015 ◽  
Vol 4 (2) ◽  
Author(s):  
Anton Setiawan Honggowibowo ◽  
Sapto Aji Wibowo
Keyword(s):  
Image Processing ◽  
Optical Flow ◽  
Real Object ◽  
User Needs ◽  
Object Retrieval ◽  
Optical Flow Method ◽  
Object Movement ◽  
Technological Developments ◽  
Computer Vision Applications ◽  
Computer Development

Technological developments in the field of computers getting faster requires the ability of each person to be able to follow the progress of computer development. Computer vision applications is an application that allows the computer to have the ability to be able to capture and understand the data, such as image and make decisions based on the data from the real object movement that was in front of the webcam and then the data obtained is processed in accordance with user needs. Digital image of a real object is captured by a webcam can be done in various ways making objects. In this research, object retrieval by utilizing activity in this object is that caught on webcam pen is through the form and motion of objects. Once an object is detected then the object is to move the cursor on a computer. To be able to perform image processing, this application uses OpenCV components. Meanwhile, to be able to perform tracking of the cursor object using optical flow method. Cursor moves when the pen has a rectangular sides and parallel to the pen position frame of grabber.

scholarly journals Nonlinear Pulse-Time Conversion in Radioisotope Devices: Analysis and Application Possibilities

2021 ◽  
Vol 12 (2) ◽  
pp. 133-138
Author(s):  
A. M. Vodovozov
Keyword(s):  
Real Time ◽  
Radiation Detector ◽  
Flaw Detection ◽  
Transformation Function ◽  
Computing Device ◽  
Measuring Devices ◽  
Object Movement ◽  
Set Of Points ◽  
Pulse Flux ◽  
Time Pulse

The paper considers the operation of radioisotope measuring devices under dynamic conditions, when the Poisson pulse flux at the output of the radiation detector becomes unsteady and the nonlinearity of the calibration curve of the device, the stochasticity of the radiation signal and the inertia of the meter significantly complicate the task of estimating the measured physical parameter. of the device and analysis of the possibility of its application for linearization of the characteristics of the device, increasing the speed of the devices and solving the measuring problem in real time.The process of nonlinear transformation of the radiation signal in the system is analyzed on the basis of the assumption about the exponential distribution of the intervals between the pulses of the information flow at the output of the radiation detector. A generalized algorithm for the synthesis of a given transformation function of a time-pulse computing device of a radioisotope device has been developed according to its mathematical description. To describe the transformation function given by a set of points, it is proposed to use its approximation by a power series.The proposed calculation formulas are verified by modeling in the Scilab program on a specific example of linearization of the curve of a radioisotope altimeter with a given tabular calibration characteristic. The results obtained confirm the expediency of using time-pulse computing devices for linearizing the conversion curve of radioisotope devices in real time.Carrying out calculations according to the proposed algorithms by means of modern microelectronics opens up new possibilities for expanding the field of application of radioisotope devices in dynamic problems of industrial flaw detection, measuring the parameters of object movement, thickness of rolled products and coatings, in devices for continuous monitoring of liquid media.

Discrimination Between Movements of Eye and Object by Visual Interneurones of Crickets

1969 ◽  
Vol 50 (3) ◽  
pp. 723-732
Author(s):  
JOHN PALKA
Keyword(s):  
Eye Movement ◽  
Voluntary Movement ◽  
Compound Eye ◽  
Visual Fields ◽  
Object Motion ◽  
Visual Environment ◽  
Inhibitory Mechanism ◽  
Object Movement ◽  
Moving Stimulus ◽  
Homogeneous Environment

1. One large neurone on each side of the cervical and thoracic ventral nerve cord of crickets responds to object motion anywhere in the visual field of the ipsilateral compound eye, but not to the forced or voluntary movement of the eye itself. 2. This discrimination between self-movement and object-movement is accomplished by an inhibitory mechanism mediated by the same eye. 3. Inhibition must be present because a potent moving stimulus becomes ineffective if presented during a forced eye movement. 4. Its visual origin is demonstrated in two ways: (a) abolishing all known mechanosensory feedback does not disrupt the mechanism, but (b) alteration of visual conditions does so in a predictable way. Sweeping the eye past a complex visual environment suppresses the neurone's response to a concurrently or subsequently presented moving target, whereas the same movement past a simplified or homogeneous environment produces little or no inhibition. 5. Responses to eye movement itself are greatly enhanced in appropriately simplified visual fields, reinforcing the conclusion that the inhibition preventing response in complex fields is of visual origin. 6. Suggestive evidence for an additional inhibitory mechanism associated with voluntary movement is presented.

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