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871results about How to "Avoid blur" patented technology

Liver subsection method based on CT image and system thereof

The invention discloses a liver division method based on a CT image, which comprises the following steps: firstly, an MSCTP artery sequence image and a hepatic portal vein sequence image of the abdomen are pretreated, and the outline of the liver is automatically divided to obtain the liver image; secondly, a multi-scale filtering method based on a Hessian matrix is used for strengthening blood vessels, a dividing method such as region enlargement, and the like is used for dividing the hepatic portal vein, and a three-dimensional topology thinning method is used for picking up the central line of the hepatic portal vein; the blood vessels are identified mutually in classification; distance change and Voronoi arithmetic are then used for calculation, and the outline of the liver is used for covering values to obtain division results; the three-dimensional liver division results are finally reconstructed. The system comprises a liver division module, a blood vessel strengthening dividing and a thinning module, a blood vessel classifying module, a liver dividing module and a three-dimensional reconstructing module. The invention can reduce noise as well as avoid the vagueness of the boundary of the liver, effectively and exactly divides the outline of the liver, improves the division quality of the hepatic portal vein tree, and realizes accurate and rapid division of the liver.
Owner:HUAZHONG UNIV OF SCI & TECH

Method for super-resolution imaging of foresight array SAR based on sparse representation

InactiveCN103869316AQuality improvementOvercoming problems constrained by array lengthRadio wave reradiation/reflectionImaging algorithmMaximum a posteriori estimation
The invention discloses a method for super-resolution imaging of a foresight array SAR based on sparse representation. The method mainly solves the problems that an existing foresight imaging algorithm is difficult to achieve physically, and system cost is high. The method comprises the steps that (1) SAR echo data are received in a double-base mode, and echo signals are modified in a single-base mode; (2) range pulse compression and direction dimension unbinding and frequency modulation are conducted on the modified echo signals; (3) according to the observation scene and the sparse characteristic of an imaging target, a cost function of SAR imaging of the processed signals is established through the maximum posterior probability estimation method; (4) the updated quasi-Newton algorithm is used for solving the cost function, and then a super-resolution imaging result of the foresight array SAR is obtained. By means of the method, a high-resolution foresight imaging result can be obtained under the condition of a limited array length, the cost and complexity of a system are effectively lowered, and the method can be applied to target detection, topographic reconnaissance, guidance, city planning and environment surveys.
Owner:XIDIAN UNIV

Rotating type multi-station pad printing machine

The invention discloses a rotating type multi-station pad printing machine which comprises a machine table, a rotary table conveying device located on the machine table, a feeding conveying unit, a feeding adsorption unit, a pad printing assembly, a detecting unit, a discharging adsorption unit, a discharging conveying unit and a glue head cleaning assembly, wherein the feeding conveying unit, the feeding adsorption unit, the pad printing assembly, the detecting unit and the discharging adsorption unit are arranged around the rotary table conveying device, the discharging conveying unit is in butt joint with the discharging adsorption unit, and the glue head cleaning assembly is located beside the pad transfer assembly. According to the rotating type multi-station pad printing machine, a series of full-automatic actions such as automatic feeding, automatic pad printing, automatic detecting, automatic discharging and automatic glue head cleaning can be achieved, and the production efficiency is high; due to the fact that a bearing plate provided with adhesive tape is moved to the position below a glue head through a driving part so that the work of cleaning the glue head can be completed during the vertical movement of the glue head, time is saved, the pad printing quality can also be ensured, and pad printing patterns can be prevented from being blurred.
Owner:KUNSHAN YITIAN AUTOMATION
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