Low-cost optical motion sensors: An experimental characterization

Minoni, U.; Signorini, Andrea

doi:10.1016/j.sna.2006.01.034

Cited by 51 publications

(34 citation statements)

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“…Dado que se seguían buscando soluciones para el empleo de ratones ópticos en la estimación del movimiento de robots móviles, Minoni & Signorini (2005) y Palacin et al (2006) investigaron los factores que afectaban la precisión de los ratones ópticos para medir el desplazamiento de robots móviles. Encontraron que la linealidad del ratón óptico era muy buena con un coeficiente de R 2 = 0,9998 (Palacin et al, 2006), pero que la calibración del sensor dependía fuertemente de la textura de la superficie (Minoni & Signorini, 2005).…”

Section: Aplicaciones En Robóticaunclassified

“…Encontraron que la linealidad del ratón óptico era muy buena con un coeficiente de R 2 = 0,9998 (Palacin et al, 2006), pero que la calibración del sensor dependía fuertemente de la textura de la superficie (Minoni & Signorini, 2005). Concluyeron que el ratón era sensible a la orientación y obtuvieron mejoras utilizando un arreglo de múltiples sensores con diferentes orientaciones (Minoni & Signorini, 2005). Encontraron también que una pequeña variación de la distancia entre el sensor y la superficie tenía gran impacto sobre la precisión y que en suelos blandos el desplazamiento del ratón podía cambiar la superficie y confundir al algoritmo de procesamiento de imágenes (Palacin et al, 2006).…”

Section: Aplicaciones En Robóticaunclassified

“…Por otra parte, descubrieron que el ratón tenía problemas para medir desplazamientos combinados (trayectorias diagonales y curvas) y que tenía un límite máximo de velocidad (Minoni & Signorini, 2005). Más adelante, Jackson et al (2007) realizaron un análisis comparativo de varias tecnologías de seguimiento, a saber, variedades de GPS, acelerómetros, telémetros láser, y los sensores del ratón óptico, y concluyeron que el ratón óptico era la única tecnología con precisión en el rango de milímetros siendo además la menos costosa, pero tenía como limitante la velocidad, pues solo daba lecturas confiables con velocidades menores a 7 km/h.…”

Section: Aplicaciones En Robóticaunclassified

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Reciclaje Tecnológico al Servicio de la Ciencia

Cardona

Ortiz

Restrepo

2010

TecnoL.

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Resumen:En este trabajo se hace una revisión de los desarrollos científicos logrados a partir del reciclaje tecnológico de partes de computador, más específicamente, de unidades de CD/DVD y ratones. Estos elementos, que con frecuencia son desechados generando serios problemas de contaminación ambiental, son en sí mismos elementos sofisticados y de gran precisión, que al ser producidos en masa pueden adquirirse a muy bajo costo. Estas características los convierten en equipos interesantes para trabajos de investigación científica que buscan alternativas simples, de bajo costo y miniaturización de equipos (laboratorio en un chip). Microscopios, interferómetros, escáneres, odómetros, manómetros, péndulos, codificadores, entre otros, son los desarrollos que se han logrado a partir de la reutilización de estos elementos. Aquí se muestra el principio de funcionamiento de estas partes de computador, las aplicaciones a que han sido objeto desde su invención y otros campos de aplicación potenciales como conclusión de la revisión realizada. Palabras clave:Reciclaje tecnológico, ratón, CD/DVD, laboratorio en un chip, bajo costo.

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Section: Aplicaciones En Robóticaunclassified

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Reciclaje Tecnológico al Servicio de la Ciencia

Cardona

Ortiz

Restrepo

2010

TecnoL.

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“…Unfortunately, CM sensors have been found to suffer from errors that alter the accuracy and precision of their measurements, such as: inconsistent registration of motion about the two measurement axes (Palacin et al, 2006;Moore et al, 2014), and effects of surface texture and pattern (Minoni and Signorini, 2006), and illumination (Tunwattana et al, 2009). In contrast, newly developed software called 'FicTrac' (FT) provides an alternative, computer-vision-based approach to recording trackball motion, by measuring the absolute orientation, rather than the velocity, of the trackball at each point in time .…”

Section: Introductionmentioning

confidence: 99%

Insects modify their behaviour depending on the feedback sensor used when walking on a trackball in virtual-reality

Taylor

Paulk

Pearson

et al. 2015

Journal of Experimental Biology

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When using virtual-reality paradigms to study animal behaviour, careful attention must be paid to how the animal's actions are detected. This is particularly relevant in closed-loop experiments where the animal interacts with a stimulus. Many different sensor types have been used to measure aspects of behaviour, and although some sensors may be more accurate than others, few studies have examined whether, and how, such differences affect an animal's behaviour in a closed-loop experiment. To investigate this issue, we conducted experiments with tethered honeybees walking on an airsupported trackball and fixating a visual object in closed-loop. Bees walked faster and along straighter paths when the motion of the trackball was measured in the classical fashion -using optical motion sensors repurposed from computer mice -than when measured more accurately using a computer vision algorithm called 'FicTrac'. When computer mouse sensors were used to measure bees' behaviour, the bees modified their behaviour and achieved improved control of the stimulus. This behavioural change appears to be a response to a systematic error in the computer mouse sensor that reduces the sensitivity of this sensor system under certain conditions. Although the large perceived inertia and mass of the trackball relative to the honeybee is a limitation of tethered walking paradigms, observing differences depending on the sensor system used to measure bee behaviour was not expected. This study suggests that bees are capable of fine-tuning their motor control to improve the outcome of the task they are performing. Further, our findings show that caution is required when designing virtual-reality experiments, as animals can potentially respond to the artificial scenario in unexpected and unintended ways.

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A low cost wearable optical-based goniometer for human joint monitoring

Lim

Luo

Chen

et al. 2010

Front. Mech. Eng. China

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Widely used in the fields of physical and occupational therapy, goniometers are indispensible when it comes to angular measurement of the human joint. In both fields, there is a need to measure the range of motion associated with various joints and muscle groups. For example, a goniometer may be used to help determine the current status of the range of motion in bend the arm at the elbow, bending the knee, or bending at the waist. The device can help to establish the range of motion at the beginning of the treatment series, and also allow the therapist to monitor progress during subsequent sessions. Most commonly found are the mechanical goniometers which are inexpensive but bulky. As the parts are mechanically linked, accuracy and resolution are largely limited. On the other hand, electronic and optical fiberbased goniometers promise better performance over its mechanical counterpart but due to higher cost and setup requirements does not make it an attractive proposition as well. In this paper, we present a reliable and non-intrusive design of an optical-based goniometer for human joint measurement. This device will allow continuous and longterm monitoring of human joint motion in everyday setting. The proposed device was benchmarked against mechanical goniometer and optical based motion capture system to validate its performance. From the empirical results, it has been proven that this design can be use as a robust and effective wearable joint monitoring device.

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Low-cost optical motion sensors: An experimental characterization

Cited by 51 publications

References 6 publications

Reciclaje Tecnológico al Servicio de la Ciencia

Reciclaje Tecnológico al Servicio de la Ciencia

Insects modify their behaviour depending on the feedback sensor used when walking on a trackball in virtual-reality

A low cost wearable optical-based goniometer for human joint monitoring

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