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Absolute tracking in a sub-pixel range

A sub-pixel, pixel technology, applied in the field of absolute tracking, can solve the problem that 3PP approximation is not suitable for absolute benchmarks

Active Publication Date: 2010-12-01
PIXART IMAGING INC
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Problems solved by technology

However, the 3PP approximation is not suitable for absolute references because the accumulated errors rapidly exceed acceptable limits in accordance with the 3PP approximation's tendency to distort the approximation in a non-linear manner

Method used

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  • Absolute tracking in a sub-pixel range
  • Absolute tracking in a sub-pixel range
  • Absolute tracking in a sub-pixel range

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Embodiment Construction

[0022] While many embodiments have been described, at least some of the described embodiments relate to optical navigation devices capable of absolute tracking in the sub-pixel range. Embodiments of the optical navigation device reduce tracking errors due to non-linear sub-pixel approximation. In particular, optical navigation devices can reduce accumulated errors caused by re-referencing in conventional systems. Embodiments of the optical navigation device also increase the accuracy of the optical navigation system.

[0023] figure 1 A simplified diagram of one embodiment of an optical navigation system 100 is illustrated. The illustrated optical navigation system 100 includes an optical navigation device 102 relative to a navigation surface 104 . Typically, optical navigation device 102 illuminates a portion of navigation surface 104 to produce an image of the illuminated portion or feature at navigation surface 104 . More specifically, optical navigation device 120 move...

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Abstract

An optical navigation device for absolute tracking in a sub-pixel range. The optical navigation device includes an image sensor and a tracking engine. The image sensor includes a pixel array to generate a plurality of tracking images. The tracking images correspond to incident light at the pixel array. The tracking engine determines a sub-pixel displacement value of a tracking surface based on a comparison of at least two of the tracking images. The tracking engine includes a sub-pixel approximation engine and a linear approximation engine. The sub-pixel approximation engine generates an intermediate sub-pixel displacement value based on a sub-pixel approximation according to a non-linear sub-pixel distribution. The linear approximation engine generates a final sub-pixel displacement value from the intermediate sub-pixel displacement value.

Description

technical field [0001] The present invention relates to absolute tracking in the sub-pixel range. Background technique [0002] Optical navigation devices typically use image correlation techniques to determine the movement of the optical navigation device relative to an imaged fiducial. Features within each image in the sequence of images are correlated to each other to facilitate determining the direction of movement of the device relative to the imaged (eg, surface or scene). [0003] In conventional related art, there are three parameters that can be used to determine the effect of navigation tracking technology. These parameters are speed, resolution and accuracy. The speed of the relative processing is mainly determined by the size of the navigation array that needs to be processed. A navigation array is a set of image elements (ie, pixels) that need to be processed and compared to pixels of a reference image. The pixels of the reference image are called the base a...

Claims

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Application Information

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IPC IPC(8): G01C21/00G06F3/03G01S19/39
CPCG01S17/023G01S17/89G01S19/48G06T7/20G06F3/0317H04N5/145G01S17/66G01S17/86G01S19/485
Inventor 林珲滕谭惠梦
Owner PIXART IMAGING INC
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