2715results about How to "Small distortion" patented technology

Camera system and methods to capture panoramic imagery from a camera mounted on a moving platform, using low-cost digital image sensors. The panoramic imagery appears seamless and natural to the eye. The panoramic imaging system and methods are specifically designed to accommodate the long acquisition times of low-cost digital image sensors, despite the motion of the camera during image capture. Pairs of cameras are arranged about an axis and a pairwise firing sequence enables capturing a series of adjacent images without gap or overlap. Additionally, when combined with suitable supplemental sensors, the image data provide location information about objects in the image for use in elementary photogrammetry.

A synthesized image showing the situation around a vehicle is produced from images taken with cameras capturing the surroundings of the vehicle and presented to a display. A position computation section computes position information and the reliability of the position information, for a plurality of points in the camera images. An image variable-synthesis section produces a first synthesized image from the camera images using the position information. An image fixed-synthesis section produces a second synthesized image by road surface projection, for example, without use of the position information. A synthesis scheme selection section selects either one of the first and second synthesized images according to the reliability as the synthesized image to be presented.

A guided stage mechanism suitable for supporting a reticle in a photolithography machine includes a stage movable in the X-Y directions on a base. Laterally surrounding the stage is a rectangular window frame guide which is driven in the X-axis direction on two fixed guides by means of motor coils on the window frame guide cooperating with magnetic tracks fixed on the base. The stage is driven inside the window frame guide in the Y-axis direction by motor coils located on the stage cooperating with magnetic tracks located on the window frame guide. Forces from the drive motors of both the window frame guide and the stage are transmitted through the center of gravity of the stage, thereby eliminating unwanted moments of inertia. Additionally, reaction forces caused by the drive motors are isolated from the projection lens and the alignment portions of the photolithography machine. This isolation is accomplished by providing a mechanical support for the stage independent of the support for its window frame guide. The window frame guide is a hinged structure capable of a slight yawing (rotational) motion due to hinged flexures which connect the window frame guide members.

A watermark message embedded in a cover work can be made robust to various types of post-embedding operations, while simultaneously minimizing perceptual impact on the cover work. This is accomplished by the informed coding of the watermark message to be embedded. This is also accomplished by the informed embedding of the watermark message code in the cover work. Finally, the watermark message code may be perceptually shaped to minimize impact on the fidelity of the watermarked work. Further, these techniques may be combined for maximum effect.

A meniscus combiner for a head up display (HUD) system. The meniscus combiner includes a meniscus lens; a multi-layer dichroic coating formed on a first surface of the meniscus lens; and, an anti-reflection coating formed on a second, opposite surface of the meniscus lens. The meniscus combiner preferably utilizes a non-symmetric aspheric meniscus lens which simplifies the optical system of the image source (overhead or in-dash unit) minimizing aberrations and minimizing costs. The meniscus combiner may be fabricated utilizing a number of lens sections which may be bonded together and blended. Use of multiple lens sections provides the ability to easily optimize the lens design. Alternatively, the meniscus combiner can be fabricated from a single lens.

To provide an electrostatic ultrasonic transducer arranged so that sound wave is not radiated from the rear surface while utilizing advantages of a push-pull type electrostatic ultrasonic transducer.

A push-pull type electrostatic ultrasonic transducer includes a vibrating film 11 having a conductive layer and a pair of fixed electrodes 12, 13 provided facing respective surfaces of the vibrating film, and applies a direct current bias voltage to the conductive layer of the vibrating film and applies an alternating current signal between the pair of fixed electrodes so as to allow the vibrating film to generate sound wave and outputting the sound wave generated from the vibrating film from two sound wave output surfaces via through holes provided in the respective pair of fixed electrodes. Plural through holes are provided in the front-side fixed electrode that sandwiches the vibrating film and through holes having the same shapes are provided in the rear-side fixed electrode in positions opposed to the respective through holes provided in the front-side fixed electrode, and a sound absorbing material 16 is provided facing the rear-side fixed electrode.

The invention relates to a cruise image based imaging method of a water-surface aerial view, which comprises the steps of: firstly, establishing an imaging system which comprises a server image processing system, a client interface display and interactive system, and a video collecting system of a cruise boat; installing a video camera and a GPS (Global Position System) device on the boat; collecting water-surface video data; processing the video data by the server image processing system to obtain a water aerial view; and inputting the water-surface aerial view into the client interface display and interactive system. A water-surface video is collected by the cruise boat, and is converted into the water aerial view. The method has the advantages of small distortion, short period, high aging performance, low investment and good compatibility, and is disturbed by less noise.

A running safety monitor system for car is composed of a car-carried digital image information acquiring unit with a built-in digital camera, and a car-carried embedded computer platform with a systematic image processing and decision control unit. Its monitor method includes such steps as acquiring the real-time image of ambient environment, generating digital image information, processing and analyzing the image information, classifying, and alarming when the signal class reaches an alarm standard.

The invention relates to a super wide angle mega pixel vehicle-mounted lens, comprising two lens groups and diaphragm, wherein, starting from an object space, a front lens group with negative focal power, the diaphragm and a rear lens group with positive focal power are sequentially arranged. The front lens group comprises a first and a second lenses with negative focal power and a third lens with positive focal power; and the rear lens group comprises a glued lens plate group and a sixth lens with positive focal power. The second and the sixth lenses are aspherical lens plates, and at least one face includes an aspherical mirror face. The invention can realize super wide angle, large relative aperture and low distortion, still have high light permeability and definition in the temperature range from minus 40 DEG C to plus 85 DEG C, and is especially suitable for outdoor monitoring and a vehicle-mounted camera system under adverse environment.

The invention discloses a direct type backlight luminance compensation method and a display device, and is designed for solving the problems that image distortion is large after luminance compensation in the existing direct type backlight luminance compensation methods. The direct type backlight luminance compensation method includes: receiving and confirming original gray scale of pixel (i,j) according to input images; confirming backlight brightness of each area according to the input images; dynamically confirming compensating factors fcom (i,j) according to backlight brightness in pixel (i,j) area and influence on backlight brightness from other areas outside the pixel (i,j) area to the pixel (i,j) area; compensating original gray scale of pixel (i,j) according to the compensating factors fcom (i,j) to acquire compensating gray scale of pixel (i,j), wherein, i is taken as line number of pixel, and j is taken as column number of pixel. The direct type backlight luminance compensation method and the display device have the advantages that image distortion is small, data volume is small and the like after luminance compensation.

Provided is a parameter calibration method for cameras of a vehicle-mounted all-round view system. When internal parameters and external parameters of the cameras of the vehicle-mounted all-round view system are calibrated, a set of three-dimensional calibration markers are adopted and comprise a plurality of characteristic points which can be recognized easily from images and are provided with given three-dimensional coordinates; when a vehicle to be calibrated is parked in a calibration area, automatic image data collection is carried out through manual work or through external trigger signals, characteristic point extraction is carried out on the collected images, each camera is calibrated corresponding to the three-dimensional coordinate of each characteristic point, and errors of locating are lowered through the processes such as parameter optimization. According to the parameter calibration method for the cameras of the vehicle-mounted all-round view system, through the three-dimensional calibration markers, all areas of the cameras can be covered as much as possible, and the influence of camera distortion on the measuring errors in the calibration process is small; compared with a previous plane two-dimensional calibration board, a three-dimensional calibration board is accurate in selected characteristic point position, clear in imaging and low in error value, and image stitching precision is greatly improved.

A coding method of frequency hand expansion includes copying special frequency band of low frequency excited chart to special frequency hand of high frequency (HR) to obtain HR copied-excited chart, obtaining original HR excited chart according to certain signal, regulating HR copied-excited chart to obtain regulated HR copied-excite chart, making IDFT conversion on said chart to obtain HR copied-excited signal, filtering said signal to obtain rebuilt HR time domain signal, picking up gain regulation parameter of time domain and outputting HR parameter. The device used for realizing said method is also disclosed.

A power amplifier (1) for receiving and amplifying an input signal (10) and outputting an output signal (11) is disclosed. The power amplifier comprises: N power amplifying units (12) (N is an integer larger than 1) connected in parallel so as to output amplified signals in response to the input signal (10); an output combining unit (14) for combining the output signals from the N power amplifying units (12) and outputting a combined signal as the output signal (11) of the power amplifier; and an amplitude controlling unit (15) for selectively turning ON each of the N power amplifying units (12) based on an amplitude of the input signal (10). In the power amplifier, the amplitude controlling unit (15) may comprise N amplitude adjusters (113) connected in parallel for adjusting the amplitude of the input signal (110) of the power amplifier; and a controller (115) for selectively turning ON each of the N power amplifying units (112) and controlling the amplitude adjusters (113) so that an amplitude of the output signal (111) becomes a substantially continuous function with respect to the amplitude of the input signal (110). The power amplifier may further comprise a local oscillator (222) outputting an constant envelope signal, receiving a modulation signal (210) as the input signal of the power amplifier and outputting an amplified modulated signal (211) as the output signal of the power amplifier; wherein the N power amplifying units comprise N saturation amplifying units connected in parallel so as to amplify the constant envelope signal from the local oscillator; and the amplitude controlling unit comprises an amplifying controller (215) for selectively turning ON each of the N saturation amplifying units (212) based on an amplitude of the modulation signal (210).

The invention discloses a speech enhancement method for speech recognition in a noise environment, and the method comprises the steps: combining the improved MVDR beam forming which is based on the time-frequency masking and employs the speech time-frequency domain sparsity principle with the improved Wiener filtering, acquiring a speech signal of a microphone array, and constructing an MVDR beamformer based on time-frequency masking, making full use of the spatial information of the speech signal, enhancing the speech signal in a target direction, suppressing the interference of noise in other directions, and then removing the residual noise and improving the speech intelligibility through a modified Wiener filter. The method is applied to a voice recognition front end, and can effectively remove noise and improve the voice intelligibility, thereby improving the recognition rate of a speech recognition system, solving a problem of how to reduce the speech distortion in the noise environment and improve the speech recognition rate of the noise environment. The method can be applied to a household robot and intelligent voice equipment.

A part cake defining a build produced by laser sintering and the surrounding unfused powder is contained in an enclosure, aid the enclosure includes displaceable wall portions for compressing the part cake to support the build against distortion during rapid cooling from a cooling fluid. The enclosure enables the part cake to be quickly and reliably cooled either within the laser sintering system or outside the laser sintering system. A source of cooling fluid connects to the enclosure and a lid holds the part cake in place as cooling fluid is forced through the pore volume of the cake. An inert gas blanket apparatus is also provided to reduce or prevent oxidation of the part cake and/or to cool the part cake. Once the part cake is cooled, the build produced by laser sintering may be removed from the part cake.

The invention discloses a backlight brightness compensation method and a display device and aims to solve such problems that image distortion is serious and display effect is poor in the prior art. The backlight brightness compensation method includes: receiving, and determining original gray scales of pixels according to an input image; determining backlight brightness according to the input image; linearly compensating the original gray scales according to a compensation factor fcom so as to obtain compensated gray scale of each pixel; judging whether the compensated gray scale of each pixel is larger than the maximum gray scale of the display device or not; if not, determining that the display gray scale of the pixel is the compensated gray scale; if yes, judging whether pixel brightness corresponding to the original gray scale of the pixel is smaller than the backlight brightness or not; if smaller, determining that the display gray scale of the pixel is the compensated gray scale; if not smaller, determining that the display gray scale of the pixel is the gray scale obtained by linearly compensating the original gray scale according to the compensation factor fcom. The backlight brightness compensation method and the display device have the advantages that image displaying effect is good, resolution is high, the structure is simple and production cost is low.

The invention relates to a dual-microphone-based speech enhancement device. The device comprises a digital microphone array module, a first pulse density modulation decoder module, a directivity formation module, a second pulse density modulation decoder module, a speech enhancement processing module and an output module, wherein the digital microphone array module is used for receiving a time domain noisy speech digital signal; the first pulse density modulation decoder module is used for performing frame separation, down-sampling and filtering on the time domain noisy speech digital signal to form an initial down-sampling rate digital signal; the directivity formation module is used for performing directive formation on the initial down-sampling rate digital signal to form an initially noise-reduced directive output signal; the second pulse density modulation decoder module is used for performing the frame separation, the down-sampling, the filtering and accentuation on the initially noise-reduced directive output signal to form a second down-sampling rate digital signal; the speech enhancement processing module is used for performing speech enhancement processing on the second down-sampling rate digital signal; and the output module is used for outputting a background noise-removed speech signal. The invention also provides a dual-microphone speech enhancement device-based speech enhancement method. The device and the method have a good denoising effect.

An amplifier circuit capable of suppressing the circuit scale thereof and obtaining an output signal with high power efficiency and little distortion is disclosed. In this circuit, constant-envelope signal generating section (101) generates a plurality of constant-envelope signals from an input signal. Pilot signal generating section (102) generates a plurality of pilot signals associated with the generated plurality of constant envelope signals, the plurality of pilot signals having predetermined amplitudes, predetermined phases and predetermined frequencies, respectively, the phases and frequencies being different from each other. First addition section (103) and second addition section (104) add the plurality of pilot signals to the generated plurality of constant-envelope signals. First amplifier (111) and second amplifier (112) amplify the plurality of constant-envelope signals to which the plurality of pilot signals are added. Vector adjustment section (105) corrects the amplitude or phase of one of the generated plurality of constant-envelope signals using a signal component included in the amplified plurality of constant-envelope signals and corresponding to the plurality of pilot signals.

The invention provides an anti-unmanned aerial vehicle detection system and a control method thereof. The system comprises a camera provided with an optical lens, a displayer, an automatic tracking servo mechanism controlling the camera to move, a radar device, a main controller, an interference unit, and an image identification decoder storing unmanned aerial vehicle image information. By the adoption of a photoelectric surveillance radar device combining the radar device with an optical tracking system, radar detection, optical image identification and electromagnetic interference are integrated, and the system and method play an important role in improving organic integration of unmanned aerial vehicle monitoring, the optical system and the radar device.

The present invention has provided a welding forged steel single piece piston and its manufacturing methods. A semi-finished head and a semi-finished skirt are forged respectively; the semi-finished head and semi-finished skirt are heat-treated respectively; rough machining is carried out respectively to the semi-finished head and the semi-finished skirt, and a face of weld between the two adjacent ring grooves is higher than the one under the combustion chamber; the head and the skirt are welded together through friction welding; an annular groove, a combustion chamber, a ring groove, a pinhole, an outer annulus and oil inlet/outlet holes are manufactured respectively; and the surface of the piston is phosphorized and graphitized. Compared with one-piece forged piston, it has better processing technology, because the head and skirt are forged respectively and then welded together. Over-all structural rigidity of the piston has been increased, and distortion of the ring groove in high temperature is slight because the cooling oil recess is sealed through welding. As the annular groove is located on the upper part of skirt, the weight of body of the piston is lowered and this kind of structure can accelerate engine oil returning on, decrease the clearance between the piston and the cylinder and reduce the engine oil consumption.