Predictive algorithms in the CPU of the mouse calculated the speed and direction over the grid. One refinement would be accelerating the correlation process by using information from previous motions, and another refinement would be preventing deadbands when moving slowly by adding interpolation or frame-skipping. To understand how optical flow is used in optical mice, imagine two photographs of the same object except slightly offset from each other. The laser mouse uses an infrared laser diode instead of an LED to illuminate the surface beneath their sensor. Williams and Robert S. Baumgartner, Thomas Hornak, Mark T.
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Optical mouse – Wikipedia
Unlike mechanical mice, whose tracking mechanisms can become clogged with lint, optical mice have no moving parts besides buttons and scroll wheels ; therefore, they do not require maintenance other than removing debris that might collect under the light emitter. In AugustLogitech introduced mice with two lasers, to track on glass and glossy surfaces better; they dubbed them a ” Darkfield ” laser sensor.
The amount that the edges of one photograph overhang the other represents the offset between the images, and mosue the mouwe of an optical computer mouse the distance it has moved. The technology underlying the modern optical computer mouse is known as digital image correlationa technology pioneered by the defense industry for tracking military targets. Glass laser or glaser mice have the same capability of a laser mouse but work far better on mirror or transparent glass surfaces than other optical mice on those surfaces.
The laser illumination enables superior surface tracking compared to LED-illuminated optical mice. Lyon of Xerox, used a mousr visible-light image sensor with integrated motion detection on the same mmouse   and tracked the motion of light dots in a dark field of a printed paper or similar mouse pad. By describing an optical means that explicitly overcame the limitations of wheels, balls, and rollers used in contemporary computer mice, the optical mouse was anticipated.
The development of the modern optical mouse at Hewlett-Packard Co. Predictive algorithms in the CPU of the mouse calculated the speed and direction over the grid. Views Read Edit View history. Retrieved 31 December Archived March 3,at the Wayback Machine. An optical mouse is a computer mouse which uses a light source, typically a light-emitting diode LEDand a light detector, such as an array of photodiodesto detect movement relative to a surface.
To understand how optical flow is used in optical mice, imagine two photographs of the same object except slightly offset from each other.
Place both photographs on a light table to make them transparent, and slide one across the other until their images line up. Baumgartner, Thomas Hornak, Mark T. The Impact of Innovation.
Optical Mouse USB + PS2
To do this, the mouse dims or blinks the laser or LED when in standby mode each mouse has a different standby time. Mousf other type, invented by Richard F.
One refinement would be accelerating the correlation process by using information from previous motions, and another refinement would be preventing deadbands when moving slowly by adding interpolation or frame-skipping. Optical mice capture one thousand successive images or more per second.
Though not commonly referred to as optical mice, nearly all mechanical mice tracked movement using LEDs and photodiodes to detect when beams of infrared light did and didn’t pass through holes in an incremental rotary encoder wheel. Modern surface-independent optical mice work by using an optoelectronic sensor essentially, a tiny low-resolution video camera to take successive images of the surface on which the mouse operates.
EW Optical Mouse USB + PS2
While the reconstruction of the image in the document scanning application Allen et al. Examples of mice which sacrifice power-saving in favor of performance are the Logitech G5 and the Razer Copperhead. Movement can be detected in any of these states; some mice turn the sensor fully off in the sleep state, requiring a button click to wake. Jackson at Xerox in Optical mice mathematically process these images using cross correlation to calculate how much each successive image is offset from the previous one.
As of moue mechanical mice had lower average power requirements than their optical counterparts; the power used by mice is relatively small, and only an important consideration when the power is derived from batterieswith their limited capacity. From Wikipedia, moyse free omuse. Modern optical mice work on most opaque diffusely reflective surfaces like paper, but most of them do not work properly on specularly reflective surfaces like polished stone or transparent surfaces like glass.
Optical mice often used light-emitting diodes LEDs for illumination when first popularized. Retrieved July 19, The optical mouse ultimately sold with the Xerox STAR office computer used optjcal inverted sensor chip packaging approach patented by Lisa M. The earliest optical mice detected movement on pre-printed mousepad surfaces.