The embodiments of the disclosure provide apparatus, method and system for location based touch, which can implement location based touch on the image of the projection display apparatus without the requirement of operation of the computing device by the user. A projection display apparatus comprises a projection screen and a plurality of optical sensors with two-dimension disperse layout in the back of the projection screen. The projection display apparatus further comprises an acquiring element configured to receive first light through first optical sensor of the plurality of optical sensors, wherein the first optical sensor is one or more of the plurality of optical sensors; a determining element configured to determine first coordinate information of the first optical sensor on the projection screen if the light intensity of the first light is within first light intensity range; and a sending element configured to send the first coordinate information to a computing device.

A surface including: multiple data pages, wherein each data page includes: multiple optically detectable marks indicating boundaries of the data page; and an array of data cells, wherein a location of an optically detectable mark in a data cell of the array of data cells encodes information and adjacent data pages use different encoding patterns such that an encoded value would be represented by a first pattern of marks on a first data page and the same encoded value would be represented by a second, different pattern of marks on a second data page.

One embodiment of the present invention sets forth a technique for providing an end user with a digital pen embedded with a spatially-aware miniature projector for use in a design environment. Paper documents are augmented to allow a user to access additional information and computational tools through projected interfaces. Virtual ink may be managed in single and multi-user environments to enhance collaboration and data management. The spatially-aware projector pen provides end-users with dynamic visual feedback and improved interaction capabilities.

An image pickup device includes an image pickup element which captures an image of a projection surface, an optical filter which has higher transmissivity for infrared light than for visible light, a visible light transmitting member whose transmissivity for visible light is higher than the corresponding transmissivity of the optical filter, and a switching unit which switches between a first condition where the optical filter is disposed on an optical path of light entering the image pickup element, and a second condition where the visible light transmitting member is disposed on the optical path.

A touch pen includes a main body, a connector, a first conductive pen tip, a second conductive pen tip and a switching module. The connector is disposed within the main body, and located at a first end of the main body. The first conductive pen tip and the second conductive pen tip are detachably coupled with the connector. According to a result of judging whether the connector is coupled with the first conductive pen tip or the second conductive pen tip, the switching module controls the operation mode of the touch pen. When the first conductive pen tip is coupled with the connector, the touch pen is in an active operation mode under control of the switching module. When the second conductive pen tip is coupled with the connector, the touch pen is in a passive operation mode under control of the switching module.

A display apparatus includes circuitry to receive an input of a plurality of strokes representing a drawing that includes one or more drawing components including a first drawing component. The plurality of strokes is divided under a predetermined condition to obtain the one or more drawing components. The circuitry stores, in a memory, each of the one or more drawing components and drawing data representing the drawing. The circuitry displays, on a display screen, in response to receiving an input of a second drawing component, the drawing represented by the drawing data based on the first drawing component and the second drawing component.

A display method includes detecting a write operation on a display surface by a pointer, determining whether an operation button provided on the pointer is pressed or not, displaying an image corresponding to the write operation as a first image on the display surface, when the write operation is detected and it is determined that the operation button is pressed, and erasing the first image when it is determined that the operation button is not pressed during a period when the first image is displayed.

An attenuation circuit comprises a signal propagation path and a plurality of shorting units (e.g., devices) sequentially attached to the signal propagation path. In some embodiments, each of one or more initial shorting units of the plurality of shorting units have a dominant intermodulation product term for a full amplitude signal that is less than that of each of one or more subsequent shorting units of the plurality of shorting units. In some embodiments, each of one or more initial shorting units are less sensitive to control voltage changes than each of one or more subsequent shorting units. In some embodiments, each of one or more initial shorting units provide higher levels of attenuation than each of one or more subsequent shorting units. A method includes providing the above attenuation circuit and controlling a level of attenuation provided by each shorting unit of the plurality of shorting units.

The invention relates to an augmented reality system with a headset and a control element, as well as a method for operating such an augmented reality system. The invention moreover relates to a control element of an augmented reality system.

A tactile force information presenting system includes: a tactile force presenting device that generates the stimulus; a drive device that drives the tactile force presenting device; and a tactile force non-presenting device that does not generate said stimulus to an operator, and the tactile force presenting device presents the tactile force to the operator.