15 results about "Correlative imaging" patented technology

This disclosure pertains to the field of exploration geophysics and presents a method and system for combined active and passive source reverse time migration imaging of metallic minerals. The method includes: performing time difference correction on active and passive source seismic data from the same subsurface structure; performing wavefield separation on the time-aligned active and passive source seismic data to reconstruct the P-wave and S-wave fields of the active source and the passive source; performing active and passive source wavefield extrapolation based on the two-way wave equation; obtaining active and passive source PS-converted wave imaging results using cross-correlation imaging conditions; and performing weighted superposition and fusion to obtain the combined active and passive source imaging results. This disclosure leverages the high resolution advantage of active sources combined with the deep detection capability of passive sources, replacing the limitations of single-source detection and achieving high-precision deep reverse time migration imaging.

The application discloses a two-way wave migration imaging method based on a Muller model and a VTI medium, adopts a thin plate division idea to divide a model into thin plates, obtains a positive transmission down-going migration wave field and a positive transmission up-going migration wave field of each thin plate based on a seismic source calculation, then obtains a reverse transmission down-going migration wave field and a reverse transmission up-going migration wave field based on a seismic record, finally obtains all imaging results by using a cross-correlation imaging condition, and in addition, the Muller model is used as an absorption attenuation model, which is different from the existing Kolsky-Futterman model, can further avoid the problem that the existing model cannot accurately satisfy the minimum time delay criterion, can utilize down-going migration wave field information and up-going migration wave field information through the above process, and can correct the influence of anisotropic parameters on migration imaging results and compensate the amplitude attenuation problem of seismic waves through two one-way migration operators, so that the migration imaging precision of steep dip structures is effectively improved.

A working-range-extending phase plate includes a central region, an inner annular region surrounding the central region, and an outer annular region surrounding the central region and the inner annular region. The central region has a central phase-transmission function. The inner annular region has an inner phase-transmission function. The outer annular region has an outer phase-transmission function. Respective magnitudes of the central, the inner, and the outer phase-transmission functions are, as a function of radial distance from an optical axis of the phase plate, one of: (i) constant, increasing, and increasing, (ii) decreasing, constant, and increasing, or (iii) decreasing, decreasing, and constant.

A working-range-extending phase plate includes a central region, an inner annular region surrounding the central region, and an outer annular region surrounding the central region and the inner annular region. The central region has a central phase-transmission function. The inner annular region has an inner phase-transmission function. The outer annular region has an outer phase-transmission function. Respective magnitudes of the central, the inner, and the outer phase-transmission functions are, as a function of radial distance from an optical axis of the phase plate, one of: (i) constant, increasing, and increasing, (ii) decreasing, constant, and increasing, or (iii) decreasing, decreasing, and constant.

A system and method for generating geometric dimensions of a syringe or plunger stopper are provided. The geometric dimensions may be based on at least one image of at least a part of the syringe or plunger stopper. A fixture for positioning the syringe or plunger stopper in close proximity to an associated imaging device is also provided.

A hyperspectral imaging device and method disclosed herein overcomes technical problems associated with the prior art by replacing the intensity measurement performed by the single high-resolution 2D sensor of state-of-the-art methodologies, with the measurement of intensity (fluctuation) correlations retrieved by two high-resolution 2D sensors: one—the imaging / spatial sensor dedicated to polychromatic image acquisition, the other—the spectral sensor dedicated to pure spectral measurement. In the hyperspectral correlation imaging disclosed herein, the spectral information is encoded into the intensity correlation without requiring any spectral scanning. Even though multiple exposures (frames) are generally required to reconstruct light statistics and perform correlation measurements, the exposure times are several orders of magnitude shorter than those required in the scanning approach. In addition, no changes of the device are required during such multiple exposures, which simplifies the optics / optomechanics of the device and avoids further time consumption.

The invention discloses a wood foreign matter space positioning system based on X-ray detection, which relates to the technical field of wood detection and comprises a first X-ray light source, a second X-ray light source, a first detector, a second detector and a data acquisition board electrically connected with the first detector and the second detector. According to the method, the related imaging principle of X-rays is applied, a linear array scanning imaging system is adopted to carry out online detection on the wood plate blank passing through a channel, foreign matters in the wood plate blank can be rapidly detected through an AI algorithm, automatic analysis and calculation are carried out through respective imaging results of two angles, and the spatial position of the foreign matters on the wood plate blank is determined; the system adopts two X-ray emitters and two high-efficiency detectors, the accuracy is improved through cross validation and distortion correction of the double detectors, equipment can be guided to avoid foreign matters, safety is guaranteed, processing waste products can be reduced, and labor and equipment maintenance cost is reduced.

The application discloses a VTI medium double-way wave migration imaging method based on De Wolf approximation, and comprises the following steps: firstly, dividing a model into multiple thin plates; then, based on a seismic source, sequentially calculating and obtaining a positive transmission down-going migration wave field and a positive transmission first up-going migration wave field of each thin plate from a minimum depth to a maximum depth; then, calculating a positive transmission up-going migration wave field of each thin plate at different positions from the maximum depth to the minimum depth and adding the reserved positive transmission first up-going migration wave field, so as to finally obtain the positive transmission up-going migration wave field of all the thin plates; then, based on seismic records, obtaining reverse transmission down-going and up-going migration wave fields according to the above calculation process; finally, obtaining all imaging results by using a cross-correlation imaging condition. Not only the down-going migration wave field information can be used, but also the up-going migration wave field information can be used; a double-way wave migration operator is formed by two one-way migration operators, the influence of anisotropic parameters on migration imaging results can be corrected, and finally the migration imaging precision of steeply dipping structures is effectively improved.

The invention is suitable for the technical field of computer vision, and provides a time self-correlation imaging method and system based on an adaptive orientation space window. The speckle contrast imaging and self-correlation imaging method comprises the following steps: acquiring continuous multi-frame speckle images; the method comprises the following steps: presetting a basic space window by taking a target pixel as a center, and giving a plurality of orientations; selecting a certain frame of speckle image, respectively extracting speckle light intensity sequences of corresponding orientations in the basic space window, and calculating the spatial domain variance of the light intensity sequence of each orientation; selecting the orientation with the maximum light intensity variance, and determining the orientation as an effective calculation window of the target pixel; and performing time autocorrelation function calculation based on the effective calculation window so as to solve a blood flow velocity parameter of the target pixel. According to the method, the noise of the blood flow area can be reduced, and the real-time monitoring requirement is met while the high spatial resolution is guaranteed.

The invention belongs to the field of exploration geophysics, and relates to an active and passive source combined reverse time migration metal mine converted wave imaging method and system, and the method comprises the steps: carrying out the time difference correction of active source seismic data and passive source seismic data of a same underground structure; respectively carrying out wave field separation on the active source seismic data and the passive source seismic data after time alignment, and reconstructing a P-wave field and an S-wave field of the active source and a P-wave field and an S-wave field of the passive source; performing active source wave field extrapolation and passive source wave field extrapolation based on a two-way wave equation; obtaining an active source PS converted wave imaging result and a passive source PS converted wave imaging result by using a cross-correlation imaging condition; carrying out weighted superposition fusion to obtain an active and passive source combined imaging result; according to the invention, the high resolution advantage of an active source and the deep detection capability of a passive source are combined, the limitation of single-source detection is replaced, and high-precision deep reverse time migration imaging is realized.

A method for extending a working range of an imaging system having an optical axis and an aperture stop includes imparting a wavefront aberration on an optical beam, propagating through the aperture stop, that is representable as an expansion of orthonormal circular Zernike polynomials having non-zero coefficients A11, A22, and A37. A working-range-extending phase plate imparts a wavefront aberration on an optical beam, propagating therethrough, that is representable as an expansion of orthonormal circular Zernike polynomials having non-zero coefficients A11, A22, and A37.

The application discloses an optimization method and device for viscoacoustic wave reverse-time migration imaging. The method comprises the following steps: under the constraint of a velocity model and a constant Q model of a target block, forward simulation of seismic waves in a stratum is carried out by using a viscoacoustic wave equation to obtain wave field forward simulation records at each time; based on a compensation operator, the wave field forward simulation records at each time are reverse-time extended, and wave field separation is carried out by using a wave field separation condition to obtain upgoing wave fields and downgoing wave fields; the upgoing wave fields and the downgoing wave fields are correlated and imaged by using a cross-correlation imaging condition to obtain reverse-time migration imaging results of the seismic waves; and the reverse-time migration imaging results are optimized according to an X-type operator to obtain optimized reverse-time migration imaging results. The attenuation problem of the propagation of the seismic waves in a viscoelastic medium can be solved, and more accurate reverse-time migration imaging results can be obtained.

Techniques are disclosed for facilitating multi-etch detector pixels fabrication. In one example, a method includes forming a semiconductor structure. The semiconductor structure includes a substrate layer, an absorber layer disposed on the substrate layer, a barrier layer disposed on the absorber layer, and a first contact layer disposed on the barrier layer. The method further includes forming the pixels from the semiconductor structure. The forming of the pixels includes performing a first etching operation to remove a portion of at least the first contact layer, and performing a second etching operation to remove a portion of the barrier layer and a portion of the absorber layer. Each of the pixels includes a respective portion of each of the substrate layer, the first contact layer, the barrier layer, and the absorber layer. Related systems and devices are also provided.