37results about How to "Improving the imaging rate" patented technology

A laser radar imaging device based on compressed sensing and an imaging method are disclosed. The device comprises an amplitude modulation laser light source, a beam expanding apparatus, two lenses, a DMD digital micro-mirror, an APD photoelectric detector, a high-pass filter, a multiplier, a low pass filter, two AD analog-digital converters, a control system and an image reconstruction system. After being emitted, the laser is scattered by an imaging object and then is projected to a surface of the DMD digital micro-mirror. Reflected light is focused by another lens, then is received by an APD single point detector and then is converted into an amplified voltage signal. High-pass filtering, mixing and low-pass filtering are successively performed on the voltage signal on one parallel branch and the signal penetrates into the reconstruction system after analog-digital conversion. Simultaneously, the voltage signal directly penetrates into the reconstruction system on another parallel branch after the analog-digital conversion. According to input signals of the two branches and a random matrix corresponding to a DMD control device, a certain reconstruction algorithm is combined so that the reconstruction system can complete imaging. By using the device and the method of the invention, an imaging rate and imaging quality are increased to a great extent.

The invention discloses a laser three-dimensional imaging optical transmit-receive system. According to the system, a round laser beam is shaped into a narrow strip shape, a coding disc rotating at a high speed is adopted to divide the strip-shaped laser beam into multiple sections of codes, a projection lens transmits the coded laser beam, target reflected light of corresponding image points in the multiple sections is combined by a receiving end by means of a fiber optic image transmission beam and is received by an area array photoelectric sensor, and then altitude data of multiple image points can be measured by each sensor detection unit. According to the system, the method is novel, and high-efficiency and high-seed three-dimensional measurement under the condition of a large visual field can be achieved.

The invention provides a super-resolution structure detection array confocal fluorescence imaging device and an imaging method thereof, relating to imaging devices and imaging methods thereof and aiming to solve the problems that the resolution of the existing confocal limiting technology is difficult to increase and confocal images are not clear. The device comprises a laser source, wherein a collimator and beam expander, a beam splitter prism, a 1/4 wave plate, a scanning system, an illumination objective, a fluorescent sample, a collecting lens and a CCD (charge coupled device) detector are arranged along the ray propagation direction of the laser source in sequence. The device has the effects that integration is carried out on a detection plane to change the light sensitivity of a corresponding detecting location; the OTF (optical transfer function) bandwidth of a system is expanded; the spatial cut-off frequency of a confocal fluorescence imaging system is improved and the spatial frequency domain bandwidth is expanded, thus obviously improving the lateral resolution of the imaging system; and the device is applicable to the measurement field of industrial topographic imaging.

A super-resolution structure detection array confocal coherent imaging device and the imaging method thereof provided by the invention relate to an imaging device and an imaging method thereof. The objective of the invention is to solve the problems that the resolution of the confocal spacing technology is difficult to improve and the confocal imaging is not clear. The device provided by the invention comprises a laser source; a collimation device, a microlens array, a collimating lens, a beam splitter prism, a 1/4 wave plate, a scanning system, an illumination object lens, an industrial sample, a collection lens and a CCD detector are arranged in order in the ray propagation direction of the laser source; and integration is performed on the detection surface to change the luminous sensitivity corresponding to the detection position so as to allow the system CTF bandwidth to be enlarged. The transverse resolution of the confocal system is improved while the imaging rate of the structure detection confocal coherent imaging system is enhanced; and moreover, the super-resolution structure detection array confocal coherent imaging device and the imaging method thereof are suitable for the measurement field of the industry morphology imaging.

The invention relates to a self-adaptive compressed sampling imaging method based on a Haar wavelet brother coefficient. The method comprises the following steps: firstly acquiring all wavelet coefficients under a target standard resolution by using a digital micromirror device (DMD); then from the standard resolution, predicting the next layer non-sampled important wavelet coefficient position from the layer sampled coefficient by combining a predetermined wavelet important threshold value according to the relationship between a Haar wavelet father and son coefficient and a brother coefficient, and configuring a wavelet base by using the DMD, and sampling the important wavelet coefficients to obtain a wavelet coefficient matrix with relatively high resolution; repeating predicting and sampling processes till the predetermined imaging resolution is reached to stop sampling, and carrying out wavelet inverse transform to obtain a target scene image. By combining the Haar wavelet brother coefficient information, the predicting precision of the important wavelet coefficient position is improved, the number of times of measurement required by DMD sampling is reduced, and the imaging quality and the imaging speed are improved.

The invention belongs to the technical field of magnetic resonance scanning imaging, and provides a quick imaging model training method and device, and a server. The method comprises the steps: carrying out the undersampling of an image obtained through magnetic resonance scanning according to an undersampling mask during each model iterative training, and obtaining training data; inputting the training data into a quick imaging model, performing feature extraction on the training data through N multi-granularity attention modules according to multi-scale information and an attention mechanismof an image, and fusing feature maps extracted by each multi-granularity attention module; carrying out image reconstruction on the fused feature map, and outputting imaging data; reversely calculating a gradient according to the imaging data and a target label so as to update parameters of the quick imaging model and the under-sampling mask through the gradient; and carrying out forward calculation by adopting the updated parameters and the under-sampling mask. According to the embodiment of the invention, the problems that the under-sampling mask cannot be optimized and the imaging effect is poor are solved.

The invention relates to an image scanning microscopic imaging method and device based on a double-microlens array, and belongs to the technical field of optical microscopic measurement. According tothe invention, an array type multi-focus generated by the micro-lens array is used for illuminating a sample; the imaging speed is improved, the influence of out-of-focus fluorescence is eliminated through the pinhole array, each focusing light beam is scaled by 1/2 through the second micro lens array, all-optical implementation of subsequent digital information processing of traditional image scanning microscopy is achieved, it is guaranteed that the resolution ratio is improved by two times, and meanwhile the problem that a traditional image scanning microscopy system is low in imaging speedis solved. The laser beam reaches the first micro-lens array after being expanded to generate an array type illumination beam, and after the array type illumination beam is emitted to the surface ofa sample, the objective lens collects multi-focus fluorescence from the sample and emits the multi-focus fluorescence to the pinhole array to eliminate the influence of out-of-focus fluorescence. Thesecond micro-lens array locally shrinks each focus point, meanwhile, the original focusing direction of the light beam is kept, and the zoomed fluorescence focus is imaged to the sCMOS camera under the deflection effect of the scanning galvanometer.

The invention discloses a single-pixel terahertz detection system and an image acquisition method. According to the system, a single-pixel speckle pattern is adopted to modulate a terahertz wave beamreflected by a to-be-measured target object to obtain the light field intensity value of the terahertz wave beam corresponding to each single-pixel speckle pattern, so that imaging data can be quicklyobtained, the data acquisition efficiency is greatly improved, the imaging time is shortened, and the requirements on environment and hardware by adopting single-pixel imaging are low. And meanwhile,the strong penetrating power and detection capability of terahertz waves are combined, so that the imaging resolution and detection efficiency of the system are greatly improved, high-quality imagingand detection can be carried out on the surfaces or the interiors of various objects, and the practicability is wide.

The invention discloses a terahertz photoacoustic single-pixel imaging device and an imaging method. The imaging device comprises a light source module, a spatial light modulation module, a terahertz light modulation module, a terahertz photoacoustic detection module and a processing module, wherein the light source module is used for outputting a pump laser beam and a terahertz beam; the spatial light modulation module is used for modulating the pumping laser beam and then transmitting the modulated pumping laser beam to the terahertz light modulation module; the terahertz light modulation module is used for modulating the terahertz light beam and then transmitting the modulated terahertz light beam to a to-be-imaged object; the terahertz photoacoustic detection module comprises a terahertz photoacoustic material and an ultrasonic detector, the terahertz photoacoustic material is used for generating a photoacoustic signal under the excitation of terahertz light, and the ultrasonic detector is used for converting the photoacoustic signal into an electric signal; and the processing module is used for realizing single-pixel imaging of the to-be-imaged object according to the electric signal. The device has advantages of low cost, convenience in use, high time resolution and spatial resolution and the like, and can be used for near-field terahertz imaging of an object to be imaged.

The invention discloses a multicolor fluorescence imaging method and system under single exposure. The method comprises the steps of amplifying a fluorescence sample on an image plane through an object lens to obtain a first real image on a focal plane of the object lens; arranging a reflector on the focal plane of the object lens and carrying out spectrum separation on the first real image through a 4f system and a grating arranged in the 4f system; obtaining an image after spectrum separation through a collection device, wherein the reflector is arranged on the front focal plane of the 4f system and the grafting is arranged on the focal plane in the middle of the 4f system. The multicolor fluorescence imaging method and system have the advantage that the imaging rate of a multispectral fluorescence microscopy is improved.

The invention discloses a synthetic aperture radar rapid imaging method based on a neural network, and the method comprises the steps: carrying out the low-resolution synthetic aperture radar imagingthrough employing a backward projection algorithm, carrying out the high-resolution reconstruction of an obtained low-resolution image through employing an image reconstruction model, and obtaining acorresponding high-resolution image, wherein the image reconstruction model is obtained through the following method by pre-training: performing low-resolution and high-resolution synthetic aperture radar imaging on a target by using the backward projection algorithm to obtain a training sample; and then training the neural network by taking low-resolution and high-resolution images in a series ofdifferent training samples as an input value and a true value respectively. The invention further discloses a synthetic aperture radar rapid imaging device based on the neural network. Compared witha traditional BP imaging algorithm, the method is small in calculation amount, high in operation rate, good in robustness and high in adaptive capacity.

The invention relates to the technical field of ultrasonic puncture, in particular to a vibration element array determining method, a puncture needle imaging method and ultrasonic equipment. The vibration element array determining method comprises the following steps of: stimulating a preset vibration element array to emit an ultrasonic wave to a target tissue; judging whether a global shear waveis detected or not; and when the global shear wave can not be detected, regulating the vibration element array used for emitting the ultrasonic wave in an ultrasonic probe so as to determine the distribution of a target vibration element array corresponding to the target tissue. By use of the vibration element array determining method disclosed by the invention, the distribution of the target vibration element array required by the target tissue is confirmed in advance to guarantee that the vibration element array can emit multi-angle ultrasonic wave beams during puncture, the target tissue isstimulated to generate the shear wave which is globally spread, and the problem that due to tissue attenuation, the shear wave can not be effectively spread to the position of the puncture needle, and the image of the puncture needle is not complete and is not clear can be solved. Meanwhile, according to a vibration element array distribution situation, the spreading direction of each shear waveis determined to carry out directional filtering, and imaging accuracy is guaranteed.