40results about How to "Uniform gray scale" patented technology

The invention belongs to the technical field of side-scan sonar image enhancement algorithms, and relates to a side-scan sonar image statistical enhancement algorithm based on boundary constraint. The algorithm is mainly suitable for a side-scan image with relatively consistent background field image reflection intensity in a unified area, an original image representation function is made through original image statistical analysis, a corrected image is obtained by constructing a feature correction function, the overall pixel of the corrected image is stretched through a linear stretching function, and the image reflection intensity of the background field image is relatively consistent. And a representation function of the stretched image is solved, and the corrected image is adjusted and corrected through boundary condition constraints, so that a high-quality image is finally obtained. According to the algorithm, the longitudinal statistical law of the side-scan sonar is used as a constraint condition, gray balance can be carried out on the side-scan sonar image, and the situation that the gain effect of a traditional gain method on part of images is poor can be eliminated.

The embodiment of the invention discloses a mammary gland image processing method and a mammary gland imaging device. The method includes: obtaining an original scanning image, and obtaining a low-frequency image and a high-frequency image according to the original scanning image; determining gray-scale transformation parameters according to the gray-scale distribution of glands and fat of the low-frequency breast image corresponding to the low-frequency image; Perform grayscale transformation on the low-frequency image according to the grayscale transformation parameters to obtain a target low-frequency image after thickness equalization, and reconstruct the target low-frequency image and the high-frequency image to generate a target image. Through the above technical solution, the problem that breast image processing is too dependent on empirical parameters and its equalization effect is not good is solved, and the automation of breast image thickness equalization is realized to a certain extent, and breast images with more uniform gray scale distribution can be obtained, thereby Make breast images more in line with clinical needs.

The invention relates to an industrial vision inspection technology, and discloses a method and device for imaging a non-uniform velocity moving object by a TDI (Time Delayed Integration) CCD (Charge Coupled Device). Speed signals measured by a rotary encoder connected with a measured moving object are divided into two paths which are respectively transmitted to a light source illuminance controller and a camera flipping frequency controller, the light source illuminance controller is used for controlling the illuminance of the light source, the camera flipping frequency controller is used for controlling the exposure of the TDI CCD, the line sweeping speed rate of the CCD and the movement speed rate of the measured object are the same so as to complete the imaging of the measured object. The light source illuminance controller converts pulse frequency signals into voltage signals, the voltage signals control a constant current source so as to further output current to an LED (Light Emitting Diode) light source, so that the illuminance of the light source is adjusted. According to the method and the device, the measured object can be clearly imaged and an image with a uniform gray level can be obtained under the condition of non-uniform movement.

The invention discloses a seeker aiming and positioning method and an aiming and positioning system, wherein the method comprises: sending laser light through the optical window of the seeker into the optical system; receiving the cat's eye echo signal returned by the optical system, After the axial compression unit compresses the field of view, it enters the photodetection imaging unit for imaging and outputs to the signal processing unit; wherein, by controlling the working sequence of the laser and the photodetection imaging unit, the original images of two adjacent frames formed by the photodetection imaging unit Corresponding to the emission state and non-emission state of the laser, respectively, to obtain the difference image of two adjacent frames, and output it to the signal processing unit; the signal processing unit uses the centroid capture algorithm to calculate the difference image, and obtains the gray value centroid of the difference image position, output target information. The present invention has a compact overall structure, and can output target position information whose accuracy is higher than that of a single pixel by improving the working mode and calculation method.