721 results about "Gray code" patented technology

A method of transmitting digital information comprises the steps of forward error correction encoding a plurality of bits of digital information using complementary pattern-mapped convolutional codes, modulating a plurality of carrier signals with the forward error corrected bits, and transmitting the carrier signals. The modulation can include the step of independently amplitude shift keying in-phase and quadrature components of the QAM constellation using Gray code constellation points corresponding to amplitude levels. Transmitters that transmit signals in accordance with the method and receivers that receive such signals are also included.

The invention relates to a rapid three-dimensional measurement method based on colorful grating projection in a three-dimensional scanning system. The method comprises the following steps: selecting four pure colors of green, yellow, cyan and white so as to carry out color strip encoding, wherein the G component values of the four pure colors are 255, and the R component values and the B component values of the four pure colors are respectively 0 or 255; after finishing color encoding, carrying out sinusoidal modulation on the G component of strip color to finally obtain a projective grating; on one hand, resolving G component information to obtain a folding phase value by a method based on Fourier transform, on the other hand, carrying out binaryzation on the R component and B component of an image by an iteration threshold method in the color image segmentation link, and automatically assigning 255 to the G component; and segmenting an image decipher to obtain phase period information so as to unfold the phase. By utilizing the method, inconvenience for cutting brought by periodic occurrence of light and shade strip-shaped areas in the image caused by G component sinusoidal modulation can be well avoided, and a train of thought for realizing three-dimensional dynamic measurement can be provided on the premise of not influencing the measurement accuracy.

The invention discloses a method for three-dimensionally reestablishing a surface contour of a human body, and the method is characterized by comprising the following steps: (1) the projection region of a protector, the shooting region of a camera and the measured part of the human body are corresponding; (2) the projector projects one image once, the camera collects one image, and the projected image comprises black and white images, Gray code images and phase shift grating images; and (3) the collected pictures are processed to obtain the three-dimensional information of the surface contour of the human body. In the invention, a phase error compensation curve is designed and the reestablishment accuracy of the surface contour of the human body is enhanced according to the characteristics of the projector and the time characteristics in the projecting and shooting courses; a common period calibration method is improved and used for calibrating the absolute phase of the surface contour of the human body, thereby enhancing the reestablishment accuracy of the surface contour of the human body; and an independent projected image generating module is adopted and used for generating the projected images and controlling the projected images of the projector, thereby facilitating the control on the time interval between the projected images of the projector and the collected images of the camera and enhancing the stability of phase error fitted functions.

The invention discloses a color structured light three-dimensional measuring method, apparatus and device, and a storage medium. The method comprises the following steps of coding four color stripe patterns by adopting a sinusoidal phase shift coding method, a segmented step phase coding method and Gray codes; sequentially focusing and projecting the four color stripe patterns on a reference planeand a measured object through a DLP projector; acquiring the stripe patterns which are not modulated on the reference plane and after height modulation deformation of the measured object through a color CCD camera; performing decoding processing on the two groups of the stripe patterns to obtain a continuous phase difference value of the measured object; and solving three-dimensional height information of the surface of the measured object by utilizing a triangular method. Through the measuring method based on color composite coding which fuses sinusoidal phase shift coding, segmented step phase coding and the gray codes, the three-dimensional measurement can be realized by only four color patterns by means of a triangular principle; and therefore, the method is small in projection amount, high in processing speed and good in anti-jamming capability, and is suitable for fast and high-precision three-dimensional measurement of objects with the non-continuous surfaces in a static scene.

The invention relates to a system calibration method for grating stripe projection-based three-dimensional measurement. A calibration object is a system consisting of a projector and a video camera. The method is implemented by the following steps: (1) adjusting the relative positions of the projector and the video camera, so that the projector is parallel with a lens longitudinal axis of the video camera; (2) calculating the absolute phase position of a reference plane by combining a sinusoidal grating phase-shifting algorithm and a Gray code; (3) placing at least two standard blocks, of which the heights are known and different, on the reference plane and calculating the absolute phase position distribution; (4) calibrating a three-dimensional measuring system: establishing projection and imaging models, deducing an object point height-phase position relational expression of an object to be measured, and fitting the coefficients of the height-phase position relational expression by utilizing the standard blocks with known heights and the absolute phase position distribution thereof and through a least square method; (5) calculating the absolute phase position value of the object to be measured and obtaining the height distribution from a calibrated expression so as to realize height measurement of the object. The method has the advantages of high operability and high measuring precision.

A technique for demodulating secondary data from a hierarchically modulated signal includes a number of steps. A gray coded eight phase shift key (8-PSK) hierarchically modulated signal is received that includes primary data and secondary data. An imaginary portion of the signal is determined and a real portion of the signal is determined. An absolute value of the real portion of the signal may then be subtracted from an absolute value of the imaginary portion of the signal to provide the secondary data. The gray coded 8-PSK hierarchically modulated signal may be a uniform gray coded 8-PSK hierarchically modulated signal or a non-uniform gray coded 8-PSK hierarchically modulated signal.

The present invention relates to electronically assisted drug delivery devices (100). The drug delivery device may include a Gray code type detector for sensing dosage data, wherein the detector comprises a code track consisting of a sequence of alternating markings and a plurality of detectors that are mutually spaced in a direction extending along the code track. The drug delivery device may also include a dosage selector (260) which is moved in a proximal direction upon dose setting and in a distal direction upon dose injection, where the dosage selector is latched in the end of dose position by a latching element, the latching element actuating an end of dose switch for signalling the end of dose state. The drug delivery device may also incorporate power-management arrangements which effectively minimizes power consumption for the incorporated electronic circuitry.