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

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 has 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.

A laser illuminating device and an image display device are provided to enable a removal of speckle noises in a diffraction field and an image field, to uniformly illuminate an illumination plane, and to realize miniaturization. The laser illuminating device 100 includes a laser light source 3 and a first lens 1 including a plurality of microlenses 10, each having a predetermined numerical aperture in an in-plane direction, and 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. The laser illuminating device 100 also includes a second lens 2 having an effective diameter larger than an effective diameter of the first lens 1, and compensating for a divergence angle of the laser light expanded by each of the plurality of the microlenses 10.

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 present invention relates a method and an apparatus for enhancing ultrasound image quality through a post-processing. A method for enhancing an image quality of a two-dimensional (2D) ultrasound image, comprises the steps of: a) decomposing the 2D ultrasound image into a plurality of images having a multi-resolution by N levels, wherein N is a positive integer; b) determining characteristics of each pixel in the decomposed image; c) performing an enhancement process for the decomposed image based on the pixel characteristics; d) performing 1st-level composition for the decomposed image; and e) repeatedly performing steps b) to d) until a size of the composed image is identical to that of the 2D ultrasound image.

A laser projector includes a laser light source; a two-dimensional light modulator which modulates light from the laser light source; and a projection optical system which projects images onto a display plane by expanding the light modulated by the two-dimensional light modulator. Shift of a display position of the two-dimensional light modulation element and shift of the projection optical system are performed in synchronization with each other so that display positions of the images on the display plane are made substantially identical to each other. Thereby, speckle noise is sufficiently removed, and high-grade images are displayed.

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.

An endoscope system is able to stably obtain an image free from speckle interference. A captured image including a first basic color component B on which a speckle noise of a laser beam is superimposed and a second basic color component G not including the speckle noise. A speckle noise component Bs is extracted based on difference information between the first basic color component B and the second basic color component G Based on the extracted speckle noise component Bs, the speckle noise component Bs is removed from the first basic color component B, so as to obtain a good observation image free from the speckle noise.

The present invention relates to a green laser generation device which can be applied to a cellular phone, and more particularly to a green laser generation device which is ultra compact in size having volume of 1 cc or less, despite having a built-in thermo electric cooler, and has sufficient output power, despite having low power consumption, and a portable electronic machine having a laser projection display using the said device. The present invention provides a green laser generation device comprising an LD pump constituted by a photo diode; a fundamental generator generating infrared light laser according to the driving of the LD pump; a second harmonic generator generating green light using the generated infrared light laser; a polarization maintenance unit inserted between the fundamental generator and the second harmonic generator to maintain the polarization of the laser; and a temperature controller controlling an internal temperature of the green laser generation device.

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 present invention provides a method and module for preprocessing ultrasound imaging. The method comprises a calculation step for constructing a multivalue vector field and a smoothing step for smoothing the whole volume data. The method further comprises a judgement step and minification and magnification steps. The module includes a calculation unit, a smoothing unit, a judgement unit, a minification unit and a magnification unit. According to the method for preprocessing ultrasound imaging, speckle noise can be eliminated effectively by calculating a mean value of a plurality of nodes distributed over the surface, so as to implement the smoothing. Therefore, this method is capable of smoothing data without compromising details.

The present application relates to a contact vibration photon sensor utilizing the Doppler effect and a manufacturing method thereof. A contact vibration photon sensor utilizing the Doppler effect, comprising an outer encapsulation layer (9), and the outer encapsulation layer (9) also includes: a silicon-based material (1) and a mirror body (2); the silicon-based material (1) A cavity (11) formed by surrounding the side wall (10) including a side wall (10) and a top opening; the mirror body (2) is arranged in the cavity (11), and the mirror body ( 2) The top has a mirror layer (21), and the side of the mirror body (2) is connected to the side wall (10) through a cantilever beam (22), and the cantilever beam (22) is spring-shaped. The contact vibration photon sensor of the present application utilizes the Doppler effect to provide accurate precision, uses a spring-shaped cantilever beam, can increase the amplitude of the mirror body (2), and improves the sensitivity of the sensor when sensing vibration.