Abstract: The invention provides a method for dynamically adjusting image frame rate, which includes: sequentially obtaining plural displacements; accumulating a count of the displacement is sequentially higher than a first threshold value, to increase an image frame rate if the count is larger than a first reference value; and accumulating a count of the displacement is sequentially lower than a second threshold value, to reduce the image frame rate if the accumulated count is larger than a second reference value.

Abstract: The invention provides an optical navigation method, which includes: sequentially obtaining plural images including a first image, a second image, and a third image; choosing a main reference block in the first image; comparing the main reference block and the second image by block matching comparison to determine a first motion vector; resizing the main reference block according to the first motion vector to generate an ancillary reference block having a size smaller than the main reference block; and comparing the ancillary reference block and the third image by block matching comparison to determine a second motion vector.

Abstract: The present invention provides a lighting control method by multi-tone multi-frequency signal, which includes: encoding a control signal into a multi-tone multi-frequency signal in a control unit; transmitting the multi-tone multi-frequency signal to a receiving unit; decoding the multi-tone multi-frequency signal to generate a command; and controlling a lighting status of at least one lighting device according to the command. The present invention also provides a device using the aforementioned lighting control method.

Abstract: The invention provides a method for dynamically adjusting image frame rate, which includes: sequentially obtaining plural displacements; accumulating a count of the displacement is sequentially higher than a first threshold value, to increase an image frame rate if the count is larger than a first reference value; and accumulating a count of the displacement is sequentially lower than a second threshold value, to reduce the image frame rate if the accumulated count is larger than a second reference value.

Abstract: The present invention discloses an optical remote control system, and a method for controlling a light source of the system. The system includes: a light source including a plurality of lighting units, the light source generating at least one light beam; an image sensor receiving an image including the light beam; and a processor determining a number or positions of the lighting units which are activated according to an area of the light beam in the image.

Abstract: The invention provides an optical navigation method, which includes: sequentially obtaining plural images including a first image, a second image, and a third image; choosing a main reference block in the first image; comparing the main reference block and the second image by block matching comparison to determine a first motion vector; resizing the main reference block according to the first motion vector to generate an ancillary reference block having a size smaller than the main reference block; and comparing the ancillary reference block and the third image by block matching comparison to determine a second motion vector.

Abstract: The present invention discloses a remote controllable video display system and a controller therefor, wherein positional information is generated by a sensor according to light from a light source. The controller includes a button with a predetermined function, wherein when the button is pressed or released, the status of the button (pressed or released) is outputted but (i) the positional information is not outputted or not processed within a predetermined period of time; or (ii) the positional information is not outputted or not processed when the remote controller has an acceleration larger than a predetermined value. Or, when the button is pressed once, the controller outputs double-click or multiple-click action information.

Abstract: The present invention discloses a locus smoothing method, comprising: generating multiple locus points by movement of an object; obtaining corresponding coordinates of the locus points; calculating a moving average coordinate of the coordinates of the locus points by a moving average function, wherein an average number is used as a denominator; adaptively adjusting the average number according to a velocity of the object, wherein a lower average number is used when the velocity of the object is relatively faster, and a higher average number is used when the velocity of the object is relatively slower.

Abstract: The present invention discloses an integrated device with AC to DC conversion function, and an integrated circuit using the device. The integrated circuit comprises: a circuit operating under low DC voltage; and an integrated device with AC to DC conversion function, the device including first, second, third and fourth diodes, wherein the first diode has a cathode coupled to an anode of the second diode at a first node which receives an input of an AC voltage; the third diode has a cathode coupled to an anode of the fourth diode at a second node which receives another input of the AC voltage; the first diode has an anode coupled to an anode of the third diode at a third node which provides a low level of a DC voltage; and the second diode has a cathode coupled to a cathode of the fourth diode at a fourth node which provides a high level of the DC voltage.

Abstract: The present invention discloses a bi-direction driver IC and a method for bi-directionally driving an object. The method comprises: providing a first and a second integrated circuit (IC) chips, coupled with an object to be driven, wherein each of the first and second IC chips is capable of single-directionally driving the object; providing a reverse current path in each of the first and second IC chips; driving the object in a first direction by the first IC chip, wherein current flows through the reverse current path in the second IC chip; and driving the object in a second direction by the second IC chip, wherein current flows through the reverse current path in the first IC chip.

Abstract: The present invention discloses a servo control circuit comprising: a first node for receiving a control voltage; a second node for receiving a feedback voltage; an operational amplifier controlling a current on a path according to the voltages at the first and second nodes, the path including an internal voltage node thereon; an analog to digital converter (ADC) for converting the voltage at the internal voltage node to a digital signal; and a control logic circuit for generating a servo control signal according to the digital signal.

Abstract: The present invention discloses a photo driver circuit with power saving function and a corresponding method thereof. The photo driver circuit with power saving function comprises: a photo sensor device for sensing light and generating a corresponding photo current; a current amplifier amplifying the photo current; an output control circuit for generating a driver output signal according to the output of the current amplifier; and a power saving control circuit for activating a power saving mode in which the power saving control circuit outputs one or more control signals to shut down one or both of the current amplifier and the output control circuit.