A computer readable recording medium comprising at least one program stored therein. An image quality improving method is performed when the program is executed. The image quality improving method comprises: (a) computing brightness contrast information of an original image captured by an image sensor of an optical navigation device; (b) computing a brightness variation level of the original image; and (c) improving an image quality of the original image based on the brightness contrast information and the brightness variation level.

A computer readable recording medium storing at least one program, wherein an image quality improvement method is performed when the program is executed. The image quality improvement method comprising: (a) classifying data units of a target image to normal data units and abnormal data units based on relations between brightness values of the data units and a classification parameter, wherein the classification parameter is related with an image quality of the target image or the brightness values of the data units; and (b) adjusting the brightness values of the abnormal data units based on an adjusting parameter to generate adjusted brightness values, such that differences between the adjusted brightness values and the brightness values of the normal data units are reduced. An optical navigation method using the image quality improvement method is also disclosed.

An optical navigation device, comprising: an optical sensor, configured to sense optical data; and a processing circuit, configured to compute motions of the optical navigation device based on the optical data, and configured to output the motions, wherein a first CPI is set to the processing circuit. The processing circuit receives a calibration command to calibrate the first CPI to a second CPI, wherein the second CPI is computed via following steps: (a) computing a real CPI corresponding to times of motions output by the processing circuit during a time interval that a relative displacement between the optical navigation device and a surface reaches a first predetermined distance; (b) computing a ratio between the real CPI and the first CPI or a difference between the real CPI and the first CPI; and (c) generating the second CPI based on the ratio or the difference.

A touch sensing system is configured to determine a state of a paper material indicative of a touch input on the paper material. The actions include receiving one or more values of features representing physical properties of a paper material. The system generates, by a pair of electrodes in a conductive material that is electrically connected with the paper material, an electric field in the conductive material. The paper material is configured to shunt current from the conductive material when the paper material is touched. The system measures the electric field in the conductive material in the conductive material. The system generates an approximation of the electric field in the conductive material. The system determines with a classifier a state of the paper material indicative of a touch input on the paper material.

A smart pen including: a body part; a nib part at an end of the body part; a code detection unit for receiving light reflected from a display panel and the nib part, wherein the light reflected from the display panel and the nib part is used to detect shape data for code patterns of the display panel; and a code processor for generating coordinate data based on the shape data and transmitting the coordinate data to a main processor for driving the display panel based on the coordinate data.

A writing system that includes a reusable notebook including a sheet having a working surface. The working surface includes a printed code and an operative control. The writing system includes a writing instrument configured to capture images of the printed code and a computing device configured to communicate with the reusable notebook and/or the writing instrument. The sheet includes a surface coating over the working surface configured so that a writing material of the writing instrument can be removed by applying a dry ancillary device.

A method for improving spatial awareness of a user during drawing includes obtaining, using one or more sensors, position information of a drawing instrument relative to a drawing canvas. The method includes determining, using one or more processors, a first vibration intensity when the drawing instrument is within a first region of the drawing canvas based on the obtained position information. The method includes determining, using the one or more processors, a second vibration intensity when the drawing instrument is within a second region of the drawing canvas based on the obtained position information. The second vibration intensity can be larger than the first vibration intensity and the second region can be distinct from the first region. The method includes generating, by a sensory device, a vibration based on one or both of the first vibration intensity or the second vibration intensity.

Systems and methods for through-display imaging. An optical imaging sensor is positioned at least partially behind a display and is configured to emit shortwave infrared light at least partially through the display to illuminate an object, such as a fingerprint, in contact with an outer surface of the display. Surface reflections from the object are received and an image of the object can be assembled.

One embodiment of the present invention relates to an electronic device for reproducing, in time sequence, first pen data in which handwriting strokes are digitized on a medium by an electronic pen. The electronic device comprises: a communication module; a control module; an output module for reproducing or outputting first handwriting information, first image or audio information photographed or recorded by the electronic device, and event information in time sequence; and a memory module for storing contents including the first handwriting information, the first image or audio information, and the event information, wherein, when the communication module further receives second pen data in a state where the first handwriting information is held on the output module after the contents are stored in the memory module, second handwriting information corresponding to the second pen data is added to the first handwriting information and then reproduced.

A mouse pad includes a mat part having a fixation portion and a 3D decorative object removably fixed on the fixation portion.