35results about How to "Remove speckle noise" patented technology

An object of the invention is to provide a laser illuminating device and an image display device that enable to remove speckle noises in a diffraction field and an image field, uniformly illuminate an illumination plane, and realize miniaturization. A laser illuminating device 100 includes a laser light source 3, a first lens 1 including a plurality of microlenses 10 each having a predetermined numerical aperture in an in-plane direction, each of the microlenses 10 being adapted to expand laser light emitted from the laser light source 3 to thereby superimpose the laser light transmitted through each of the microlenses 10; and a second lens 2 having an effective diameter larger than an effective diameter of the first lens 1, and for compensating for a divergence angle of the laser light expanded by each of the plurality of the microlenses 10.

Disclosed are apparatus and methods for illuminating a sample, e.g., during an inspection of such sample for defects. In one aspect, the illumination apparatus includes a bundle of fibers that each have a first end and a second end. The illumination apparatus further includes an illumination selector for selectively transmitting one or more incident beams into one or more corresponding first ends of the optical fibers so that the selected one or more incident beams are output from one or more corresponding second ends of the fibers. The illumination apparatus also includes a lens arrangement for receiving the selected one or more incidents beams output from the corresponding one or more second ends of the fibers and directing the selected one or more incident beams towards the sample. The lens arrangement and the fibers are arranged with respect to each other so as to image an imaging plane of the sample at the second ends of the fibers. In one aspect, the incident beams are laser beams. In a specific application of the invention, the sample is selected from a group consisting of a semiconductor device, a semiconductor wafer, and a semiconductor reticle.

An ultrasound imaging breast tumor detection and diagnostic system and method is disclosed. The method uses the system to acquire a plurality of 3D breast ultrasound images, and then to cut out multiple regions from the 3D breast ultrasound images using a 3D means shift algorithm, and then to acquire the mean grayscale value (MGV) of each region, and then to classify the regions to groups subject to the mean grayscale value (MGV), and to merge each of the regions of the darkest group with adjacent regions of the similar grayscale into a respective suspicious tumor tissue full region, and then to recognize each suspicious tumor tissue full region to be a tumor tissue region or non-tumor tissue region. Thus, using region as the basic computing unit, tumor tissues are quickly recognized from the 3D breast ultrasound images.

The invention discloses a shearlet transform and fast bilateral filter image denoising method, comprising the following steps: 1) using a noise imaging system to collect the envelope signal of a noise image, and establishing a medical ultrasonic image model; 2) performing the step 1 ) The medical ultrasound image model obtained after the logarithmic transformation utilizes a pyramid filter bank to perform multi-scale and multi-directional decomposition, 3) the two-dimensional discrete shearlet transformation coefficient of the high-frequency part in each sub-band image obtained in the step 2) Carry out threshold method contraction processing; 4) Utilize fast bilateral filter to carry out filter processing to the shearlet coefficient of step 2) middle and low frequency part; 5) Perform shearlet inverse transformation processing to all coefficients after step 3) and step 4) processing, obtain Noised medical ultrasound images. The introduction of the fast bilateral filter in the present invention can not only improve the denoising performance but also greatly improve the processing efficiency.

Provided is a complicated background SAR image naval ship tail track detection method. Firstly, morphological component analysis or relative total variation regularization is carried out on an SAR image, and the image is decomposed into a texture component representing a complication sea surface and a structure component containing naval ship tail tracks; then image enhancement is carried out on the structure component and thresholding is carried out on a gradient image, and accordingly a binary image of a naval ship tail track area is formed; finally, radon transformation or Hough transformation linear detection is carried out on the enhanced naval ship tail track area, inversion is carried out in a conversion domain, and continuous tail tracks and related parameters are obtained. Structure and texture decomposition is carried out on the SAR image, and influences of speckle noise and complicated textures on naval ship tail track detection are eliminated; image enhancement is carried out on the structure component, binaryzation is carried out on the gradient image, and the naval ship tail track area is further highlighted.

The present invention relates to a light diffusion cell for laser light where in a transparent cell in which a liquid can be sealed, a fine particle dispersion in which fine particles having an average particle size of 100 nm or more and 1.5 μm or less are colloidally dispersed in a liquid medium transmitting light, a same light diffusion cell comprising a reflection mechanism recursively using reflection light of incident light, a laser light source device comprising said light diffusion cell and a semiconductor laser light source and an image display device comprising said light diffusion cell or said laser light source device, and said light diffusion cell significantly reduce or remove speckle noise of semiconductor laser light. In addition, said light diffusion cell has an easy constitution, occupies a smaller volume and can be easily incorporated in any type of image display device using laser light. Therefore, it is possible to significantly reduce or remove speckle noise without large-sizing of an image display device using laser light or a higher cost-up.

A lightweight, compact image projection module, especially for mounting in a housing having a light-transmissive window, is operative for causing selected pixels in a raster pattern to be illuminated to produce an image of high resolution of VGA quality in monochrome, color or gray scale. Edge-emitting light emitting diodes are employed, together with mutually orthogonal cylindrical lenses, to render the module with a short, slim form factor.

The invention provides a real-time three-dimensional image smooth processing method based on graphics processing units. The method orderly comprises the following steps that: (1) the data of a three-dimensional image to be processed is transmitted to a graphics processing units; (2) coordinates of related points around a pixel point to be processed are figured out; (3) the related points are sampled, so as to obtain the data values of the related points; (4) the average value of the data values of the related data points is calculated; (5) the squares of the difference of the data values of the related data points and the average value are respectively calculated, and the numerical values calculated are saved in an array; (6) the numerical values in the array are compared, and a minimum value is figured out; (7) the prior data value of the pixel point to be processed is replaced by the data value of the related data point corresponding to the minimum value; and the steps (2) to (7) are carried out in the graphics processing units. The method can eliminate the speckle noise of the three-dimensional image, beautify the image and well preserve the prior boundary information of the image without affecting the real-time performance of three-dimensional image reconstruction.

The invention allows a shearography system to successfully sense ground/surface vibrations while moving at aircraft speeds and altitudes. This is done by effectively making stationary the apparent location of a coherent laser beam illuminating an area on the ground/surface, and also effectively making stationary the apparent location of the aperture of an optical receiver which acquires pairs of sequential images captured and used for shearography. A different laser is used for capturing each of the two images, and the distance between the two lasers is adjusted based on a number of operational parameters. The adjustment of the distance causes the apparent locations of the transmitter and a receiver sub-aperture to remain the same and permits the moving shearography to work.

The invention belongs to the technical field of digital image processing and information extracting, and specifically relates to a rapid radar data de-noising method based on a spatial modeling technology. The method comprises the following steps: reading radar data; acquiring the radar brightness coefficient, the backward scattering coefficient and the backward scattering coefficient after normalization through a radar equation; when images are different in number of looks in the same scene, combining the images through multi-look processing; and importing the images to a space model, selecting small local areas of the images, calculating the derivative values of the center pixel value in the 45-degree and -45-degree directions, performing DIST operation on the two images after derivation operation, and synthesizing the two images into a new image. The technical problem that the existing radar data de-noising method cannot achieve a good de-noising effect and a good characteristic information maintaining effect at the same time is solved. Under the premise of maintaining geological radar scattering information to the maximum degree, the image edge or linear feature can be enhanced, and high-quality radar images can be provided for subsequent processing such as fusion and interpretation.

The light source device of the projection display apparatus according to the present disclosure includes: solid-state light sources that individually emit blue light, green light, and red light; a plurality of dichroic mirrors that combine the blue light, the green light, and the red light having exited from the solid-state light sources; a first diffusion plate on which the combined light having been combined by the plurality of dichroic mirrors is incident; a dynamic diffusion plate that is disposed at a position at which the combined light having exited from the first diffusion plate converges and starts to diverge.

An image forming apparatus includes plural laser light sources, a polygonal mirror that scans plural laser beams from the plural laser light sources, and a multiplexing member that combines the plural laser beams scanned by the polygonal mirror. The polygonal mirror is disposed above or below the multiplexing member, and the extension of the rotation axis of the polygonal mirror passes through the multiplexing member. When configured in this manner, it is possible to reduce the apparatus size and speckle noises caused by the plural laser beams.

The invention discloses an anisotropic diffusion noise processing method based on an edge enhancement operator. The anisotropic diffusion noise processing method comprises the steps: firstly inputtinga to-be-processed image containing Gaussian noise, carrying out the preprocessing of a noise image through a Gaussian filter, and removing bigger noise; establishing an eight-direction 5 * 5 edge enhancement operator template, and performing convolution operation on an enhancement operator and the preprocessed image to obtain corresponding gradient information; then, constructing a diffusion coefficient model based on a hyperbolic tangent function for controlling the diffusion degree; substituting the diffusion function into an improved anisotropic diffusion equation to obtain a denoised image; and finally, repeating the steps for N times to complete iteration, and outputting the filtered image. According to the anisotropic diffusion noise processing method, image edges, textures, fine lines, weak edges and details can be effectively reserved while image noise is filtered, and the step effect is prevented, and the processing speed is higher.

The invention relates to a contact type vibration photon sensor using Doppler effect and a manufacturing method thereof. The contact type vibration photon sensor using the Doppler effect comprises an outer packaging layer (9), and the outer packaging layer (9) further comprises a silicon-based material (1) and a mirror surface body (2). The silicon-based material (1) comprises a side wall (10) and a cavity (11) which is surrounded by the side wall (10), and the top of the cavity (11) is open; and the mirror surface body (2) is arranged in the cavity (11), a mirror surface layer (21) is arranged on the top of the mirror surface body (2), the side face of the mirror surface body (2) is connected with the side wall (10) through a cantilever beam (22), and the cantilever beam (22) is in a spring shape. According to the contact type vibration photon sensor, the Doppler effect is used for providing accurate precision, the spring-shaped cantilever beam is used, the amplitude of the mirror surface body (2) can be improved, and the sensitivity of the sensor during vibration induction is improved.

The invention provides a hole filling method based on a dense disparity map and vehicle-mounted equipment. The method comprises: acquiring a dense disparity image, traversing each row of parallax points in the dense parallax image to determine a hole region and a non-hole region, determining the position of the hole area, counting the number of parallax points in the non-hole area, and carrying out hole filling on the hole areas according to the positions and the number of the hole areas. According to the invention, hole areas can be searched line by line, and then the searching result is accurate; and, in addition, hole filling can be carried out according to the positions of the hole areas and the number of parallax points of the non-hole areas, so that large plaque noise of the non-texture areas can be effectively removed, hole parallax is filled, smooth dense parallax is obtained, and consumed hardware resources can be reduced.