228 results about "Edge filter" patented technology

High performance optical edge and notch filters and methods of making the same are disclosed. The multi-layer, thin-film optical edge filters have an edge steepness greater than about 0.8% as measured by dividing (a) the edge width from the 50% transmission wavelength to the optical density 6 (“OD6”) wavelength by (b) the 50% transmission wavelength. The optical edge filters also have an average transmission above about 95%. The notch filters exhibit a blocking of OD>6, very high transmission (>90%) outside the notch(es), and a narrow notch bandwidth comparable to that of holographic notch filters. The methods for making such filters accurately determine when deposition of each layer of the filter should terminate.

A deblocking filter includes a current macroblock buffer memory configured to store video data of a current macroblock to be filtered, a side macroblock buffer memory configured to store a portion of video data of neighboring macroblocks located on the side of the current macroblock, a register buffer array configured to store video data read from the current macroblock buffer memory for current filtering, video data read from the side macroblock buffer memory, and data of neighboring macroblocks, and an edge filter that is connected to the register buffer array and is configured to perform horizontal or vertical filtering on an edge of a subblock of the current macroblock of video data and to perform the other of horizontal or vertical filtering on an edge of a subsequent subblock of the current macroblock of the video data, simultaneously. Vertical filtering uses the data from the neighboring macroblocks and horizontal filtering uses the video data from the side macroblock buffer memory.

A deblocking filter, an image encoder, and an image decoder perform edge-filtering of moving-image data which can be divided into blocks, on groups of a predetermined number of pixels arrayed across edges between the blocks, and include: a processing unit concurrently performing column-direction-edge filtering on more than one first group of pixels which are arrayed in rows across ones of the edges oriented in a column direction, the ones of the edges belonging to a macroblock to be currently processed; and an rearrangement unit rearranging pixels being included in the more than one first group of pixels and the macroblock and having been processed by the processing unit, into more than one second group of pixels in respective columns.

Optical lenses are described and include a polymeric interference filter disposed on a curved polymeric substrate. The optical lens has an average light transmission of less than 2% across a band of blue light from 400 nm to at least 420 and up to 440 nm and substantially transmits blue light greater than 450 nm.

A method and apparatus for lane detection using overhead images and positional data. A server receives positional data from a vehicle and computes a continuous trajectory. The server receives an overhead image of a road section. The server crops and processes the overhead image to remove unwanted portions. The server identifies edge features using the continuous trajectory and steerable filters. The server identifies lanes in the overhead image using a maximization algorithm, the edge filters, and the continuous trajectory.

The invention relates to an incoherent Doppler laser detection and ranging system of the Lidar type comprising an emission laser and a receiver device including at least one telescope, an edge filter, and processor means responsive to the power PT transmitted by the filter. The processor means has data inputs relating to the power PT and to the power PR and outputs a normalized signal DELTAPN, where:PR designating the power reflected by the edge filter.

Highly discriminating optical edge filters and methods of making the same are disclosed. The optical edge filters have an edge steepness greater than about 0.8% as measured by dividing (a) the edge width from the 50% transmission wavelength to the optical density 6 (“OD6”) wavelength by (b) the 50% transmission wavelength. The optical filters also have an average transmission above about 95%. The methods for making such filters accurately determine when deposition of each layer of the filter should terminate. The methods include calculating theoretical transmission data for a layer of the filter and calculating an expected deposition duration for the layer. The methods also include measuring transmission through the layer during deposition for a period less than the expected deposition duration. When the measuring period elapses, a new deposition duration is calculated based upon the theoretical transmission data and the measured transmission data, thereby providing an accurate deposition duration for the layer.

A single-ended blur detection probe and method with a local sharpness map for analyzing a video image sequence uses two sets of edge filters, one for “fast edges” and the other for “slow edges.” Each set of edge filters includes a horizontal bandpass filter, a vertical bandpass filter and a pair of orthogonal diagonal filters where the frequency response of the fast edge filters overlap the frequency response of the slow edge filters. The video image sequence is input to each filter of each set, and the output absolute values are combined with weighting factors to produce a slow edge weighted sum array and a fast edge weighted sum arra. The respective weighted sum arrays are then decimated to produce a slow edge decimated array and a fast edge decimated array. The ratio of the maximum difference value between the decimated arrays and the maximum value from the fast edge decimated array, weighted by an appropriate factor, produces a localized maximum sharpness value, the log of which produces a dimensionless blur value.

High performance optical edge and laser-line filters and methods of making the same are disclosed. The optical edge filters have an edge steepness greater than about 0.8% as measured by dividing (a) the edge width from the 50% transmission wavelength to the optical density 6 (“OD6”) wavelength by (b) the 50% transmission wavelength. The optical edge filters also have an average transmission above about 95%. The laser-line filters have an extremely high transmission in the passband (greater than 90%), an extremely narrow transmission bandwidth, and achieve blocking with an optical density (OD) greater than 5 at wavelengths that differ from the laser wavelength by less than 1% of the laser wavelength. The methods for making such filters accurately determine when deposition of each layer of the filter should terminate.

The invention relates to a radar imaging method of an electrically large size target in the ocean clutter environment. The radar imaging method is that the radar imaging of the electrically large size target in the ocean clutter environment is achieved by establishing a surface-box complex target scattering model in a multi-interference environment and adopting electromagnetic simulating calculation through a numerical and analytical hybrid algorithm and a rapid back projection imaging mode. The electrically large size in the radar imaging method means that the ratio of the physical dimension to the wavelength of the target is larger than ten. The working frequency range of a radar is generally in a high frequency area, for example, the L waveband frequency ranges from 1GHz to 2 GHz, and the S waveband frequency ranges from 2GHz to 4 GHz. Some military targets, such as fighters, invisible planes and aircraft carriers in the L waveband and the S waveband belong to the electrically large size. According to the radar imaging method, the radar imaging of the electrically large size target in the ocean clutter environment can be achieved by means of geometric modeling of complex targets, the electromagnetic simulating calculation, the rapid back projection imaging algorithm and Kaiser window edge filtering.

The invention discloses a Brillouin optical time domain reflectometer for single-photon detection based on an edged filter method, which comprises a narrow linewidth laser (1), a pulse modulator (2), a circulator (3), a sensing optical fiber (4), an optical fiber module (5), 3dB coupler (6), a linear edged filter (7), an InGaAs/InP SPAD (single-photon avalanche diode) detector group (8), a signal generator (9), a data processing module (10) and a pulse signal generator (11), wherein the InGaAs/InP SPAD detector group (8) includes two or three InGaAs/InP SPAD detectors. The InGaAs/InP SPAD detector group with a high counting rate and high sensitivity is used as a detection unit, Brillouin frequency shift information is acquired by the edged filter method, time correlation single-photon counting technology is adopted by the data processing module (10), limitations on the bandwidth and sensitivity of a traditional detector are broken through, spatial resolution and measuring precision of the reflectometer can be simultaneously improved, and temperature and strain are simultaneously sensed.

Registration information for images of a common target obtained from a plurality of different spectral bands can be obtained by combining edge detection and phase correlation. The images are edge-filtered, and pairs of the edge-filtered images are then phase correlated to produce phase correlation images. The registration information can be determined based on these phase correlation images.

A method for eliminating discontinuity of block boundaries of an image encoded in units of blocks and an apparatus thereof. A filter for eliminating discontinuity of block boundaries of an image encoded in units of blocks with a predetermined size includes: a vertical edge filtering unit which eliminates the discontinuity in the vertical direction of the blocks, by filtering sequentially in units of blocks; a determination unit which determines a start point of discontinuity filtering in the horizontal direction according to a filtering mode of a macroblock formed with the blocks; and a horizontal edge filtering unit. If the vertical direction discontinuity filtering of the blocks is finished to the filtering start point determined by the determination unit, discontinuity filtering in the horizontal direction of the blocks is sequentially performed for which the vertical direction discontinuity filtering is finished. Accordingly, time taken for filtering is reduced and unnecessary memory is not required.

The invention provides an infrared small target detection method and system based on an FPGA. Acquired images are preprocessed to be denoised and processed through blind pixel removal; a head image and a tail image are extracted; clutter edge filtering operation is carried out on the head image and the tail image; threshold segmentation operation is carried out on the head image and the tail image so that the images can be binary ; morphological expansion is carried out on the target in the head image processed through threshold segmentation and the target in the tail image processed through threshold segmentation, and targets with large contours are obtained; the head target processed through morphological expansion and the tail target processed through morphological expansion are synthesized so that a complete target can be obtained. According to the infrared small target detection method and system based on the FPGA, the signal-to-noise ratio can be increased by accumulating the superposition portions of a previous frame and a next frame, the interference of a background cloud layer can be well removed while the algorithm complexity is reduced, and the real time performance of the detection system can be improved while accuracy is guaranteed.

The invention relates to a Mask R-CNN-based reinforced concrete crack identification and measurement method, which comprises the following steps of obtaining a to-be-detected picture which is a picture with a concrete crack; searching and positioning a crack region on the to-be-detected picture based on Mask R-CNN, and segmenting a crack target in the to-be-detected picture; carrying out edge detection on the crack target through combination of a Sobel edge filtering operator, a Laplacian filtering operator and a gaussian smoothing filter, and generating a crack mask; and calculating the length and width of the crack and the crack according to the pole coordinates of the generated crack mask and the minimum bounding rectangle of the mask. Compared with other technologies, the method has relatively high efficiency in crack measurement, has more accurate extraction of crack pixels, and realizes crack detection and identification and calculation of crack length, width and area.

The invention provides a microcrack detection method, device and system and a storage medium, and the method comprises the steps: carrying out polar coordinate transformation on a target circular ring detection region image, and obtaining a rectangular detection image corresponding to the target circular ring detection region image; performing transverse edge filtering on the rectangular detection image to obtain an edge filtering image; segmenting the edge filtering image into a plurality of detection blocks according to a preset detection block size; searching for candidate defect points in each detection block, and calculating defect information of a defect area formed by the candidate defect points; according to the defect information of each defect area, determining a to-be-selected area and neighborhood information corresponding to the to-be-selected area on the rectangular detection image so as to determine microcrack defects in the rectangular detection image; and finally, performing polar coordinate inverse transformation on the defect information of the microcrack defects. According to the microcrack detection method provided by the invention, the circular ring detection area can be accurately extracted under a complex background, the microcrack defects are highlighted, and the influence of discrete interference is eliminated.

The present invention relates to a filter element having a non-porous extrusion laminated strip formed on at least one edge and at least one side of a membrane. The strip is used to provide a means for ensuring a good bond between the filter element and the material into which it is potted. The strip is formed by the use of one or more extrusion heads that apply molten or softened polymer to one or both of the surfaces of the filter in a width and height desired. The strip is then subjected to pressure such as through a nip to at least partially embed the polymer strip into the filter pores so as to create a strong mechanical bond between the strip and the filter element. Additionally, it allows for the simultaneous formation of more than one membrane with the edge lamination at the same time.

The invention discloses a virtual viewpoint drawing method based on depth value non-linear transformation. The method comprises the following steps: firstly an adaptive edge-based pre-processing filter which is composed of an edge preservation filter and an asymmetrical Gauss smooth filter in series connection; using the edge filter to iteratively process a depth map, so that not only can the noise information be removed, but also the probability of hole in an object in a target image is reduced by smoothing continuous regions in the object; using the asymmetrical Gauss smooth filter to process the depth map and the object edge, avoiding the geometrical distortion in vertical direction while smoothing the horizontal gradient; after considering a human eye visual characteristic factor, carrying out non-linear mapping on a gray scale of the depth image and a space real distance to effectively reduce the hole in a target image background and enhance the three-dimensional viewing of a user; and finally filling the hole in the target image and eliminating all holes. The method provided by the invention is simple to realize, free from geometrical distortion and low in computation complexity.

The invention relates to the spectral measurement field and discloses a Raman enhanced measurement device. The Raman enhanced measurement device comprises a laser, a collimating system, an off-axis integral cavity, an edge filter, a light receiving lens, a spectrometer and a control system, which are arranged sequentially, wherein the off-axis integral cavity comprises a front plane-concave lens and a rear plane-concave lens, the concave surfaces of the lenses face the cavity, and a tested sample is contained in the cavity; the front plane-concave lens is coated with a total reflection film, a light hole is formed in a place deviated from a central shaft, and the rear plane-concave lens is coated with a laser high-reflection edge filter film. The invention also discloses a Raman enhanced measurement method using the Raman enhanced measurement device and an off-axis integral cavity structure applied to Raman enhanced measurement. The off-axis integral cavity technology is adopted to enable laser to be oscillated back and forth in the cavity for multiple times, the number of excited molecules is greatly increased, the Raman spectrum enhancement is realized, and thus the gas or liquid sample with low molecular concentration also can generate strong Raman spectrum; the composition and the concentration of the tested sample can be simply and accurately judged through analysis of Raman spectrum peaks.

The invention discloses a phase modulation direct detection laser Doppler velometer and a velocity measuring method thereof, and relates to a direct detection laser Doppler velometer. In order to solve the problem that a method of converting frequency change of back scattering light into the change of transmittance by utilizing edge filters of a Fabry-Perot (F-P) interferometer in the current direct detection mode to obtain Doppler frequency shift is low in measuring accuracy relative to a coherent detection mode, the invention provides the phase modulation direct detection laser Doppler velometer and the velocity measuring method thereof. According to the method, a beat frequency signal of which the vibration amplitude is changed with the Doppler frequency shift of a moving target is generated by an electric-optical phase modulator and the FP interferometer; a vibration amplitude item is extracted by a phase shifter, a multiplying unit and a low-pass filter, and optical wave frequency information is identified by utilizing the vibration amplitude item; and the frequency of emitted laser and target back scattering light is measured by utilizing the turning-on state and turning-off state of a mechanical switch, and difference of two-time frequency measuring values is used as a measuring value of the Doppler frequency shift. According to the phase modulation direct detection laser Doppler velometer, the influence of the change of light intensity on a measuring result is removed by the energy detection of backward waves, so that the phase modulation direct detection laser Doppler velometer is used for measuring the movement velocity of targets in the field of optics.

Disclosed is a method for enhancing an image edge. An edge filter is applied to a photographed image, and the determination is performed with respect to whether pixels having edge possibility are noise or form an edge. The determination for the noise and the edge is performed once more with respect to pixels having vagueness for the noise and the edge by using a 3×3 mask. An edge enhancement process is performed through a simple algorithm.