# US 2017/0285218 A1 · Method and device for operating ct-based three-dimensional image used for security inspection > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2017/0285218 A1 - Document ID: US20170285218A1 - Status: Published application - Kind: A1 - Application number: 15/301,060 - Filed: 2015-12-16 - Published: 2017-10-05 - Earliest claimed: 2014-12-23 - Assignees: Tsinghua University; Nuctech Company Limited - Applicants: Tsinghua University; Nuctech Company Limited - Inventors: Li ZHANG; Shuo WANG; Yunda SUN; Qingping HUANG - Web page: https://patentgrep.com/patent/US20170285218A1 ## CPC - G01V 5/226: using tomography - G01N 23/04: and forming images of the material - G01N 23/046: using tomography, e.g. computed tomography [CT] - G06T 7/0002: {Inspection of images, e.g. flaw detection} - G06T 7/40: Analysis of texture (depth or shape recovery from texture G06T7/529) - G06T 7/50: Depth or shape recovery - G06T 7/90: Determination of colour characteristics - G06T 2207/10072: Tomographic images - G01V: GEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS (means for indicating the location of accidentally buried, e.g. snow-buried, persons A63B29/02) - G01N: INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES (measuring or testing apparatus or processes other than immunoassay, involving enzymes or microorganisms C12M, C12Q) - G06T: IMAGE DATA PROCESSING OR GENERATION, IN GENERAL ## Abstract The present disclosure provides a method and device for operating a CT-based three-dimensional image used for security inspection. The method includes: providing a CT-based three-dimensional image used for security inspection; accepting a selection of an image of an object in the three-dimensional image; and responding to the selection. The present disclosure has strong practicality, and can provide effective reference information for image judgment in the CT-based security inspection field. ## Claims ### Claim 1 A method for operating a CT-based three-dimensional image used for security inspection, comprising: providing a CT-based three-dimensional image used for security inspection; accepting a selection to select an image of an object in the three-dimensional image; and responding to the selection. ### Claim 2 (depends on 1) The method for operating a CT-based three-dimensional image used for security inspection according to claim 1, wherein the accepting the selection to select the image of the object in the three-dimensional image, comprises: accepting a selection to entirely select the image of the object in the three-dimensional image. ### Claim 3 (depends on 2) The method for operating a CT-based three-dimensional image used for security inspection according to claim 2, wherein the accepting the selection to entirely select the image of the object in the three-dimensional image, comprises: accepting a single-click selection or a frame selection on the image of the object in the three-dimensional image to entirely select the image of the object. ### Claim 4 (depends on 1) The method for operating a CT-based three-dimensional image used for security inspection according to claim 1, wherein the accepting the selection to select the image of the object in the three-dimensional image, comprises: accepting a local selection to locally select the image of the object in the three-dimensional image. ### Claim 5 (depends on 4) The method for operating a CT-based three-dimensional image used for security inspection according to claim 4, wherein the accepting the local selection to locally select the image of the object in the three-dimensional image comprises: accepting a double-click selection on the image of the object in the three-dimensional image to select a section of the image of the object; or accepting a local frame selection on the image of the object in the three-dimensional image to select a local region of the image of the object. ### Claim 6 (depends on 2) The method for operating a CT-based three-dimensional image used for security inspection according to claim 2, wherein the responding to the selection comprises: displaying one or more of the following pieces of information: an image contour and a three-dimensional size of the image of the selected object, a density, an atomic number, a CT number and a substance state of the selected object, and information indicating whether the object is a hazardous object; and/or if the object is a hazardous object, providing an alert or a notification. ### Claim 7 (depends on 4) The method for operating a CT-based three-dimensional image used for security inspection according to claim 4, wherein the responding to the selection comprises: displaying one or more the following pieces of information: a size of a local region of the image of the selected object, a density, an atomic number, a CT number and a substance state of the selected object, and information indicating whether the object is a hazardous object; and/or if the object is the hazardous object, providing an alert or a notification. ### Claim 8 (depends on 1, 2, 3, 4, 5, 6, 7) The method for operating a CT-based three-dimensional image used for security inspection according to claim 1 any one of any one of claims 1 to 7, wherein the providing the CT-based three-dimensional image used for security inspection, comprises: performing three-dimensional volume rendering on the CT-based image used for security inspection, and obtaining position information of surfaces of the object in the three-dimensional image. ### Claim 9 (depends on 8) The method for operating a CT-based three-dimensional image used for security inspection according to claim 8, wherein the performing the three-dimensional volume rendering on the CT-based image used for security inspection, comprises: casting rays of light along a viewing direction; performing a volume texture sampling on the CT-based image used for security inspection according to the cast rays of light, and obtain color information; and performing color combination and outputting a three-dimensional volume rendering result. ### Claim 10 (depends on 9) The method for operating a CT-based three-dimensional image used for security inspection according to claim 9, wherein the obtaining position information of surfaces of the object in the three-dimensional image, comprises: according to a preset transparency threshold, recording positions where the rays of light firstly hit opaque regions in the CT-based image used for security inspection as surface depths of the image of the object; calculating gradient values of voxels at the positions as normal direction information of the positions; and while outputting the three-dimensional volume rendering of the CT-based image used for security inspection, recording the surface depths and normal direction information of the image of the object in the three-dimensional image. ### Claim 11 (depends on 8) The method for operating a CT-based three-dimensional image used for security inspection according to claim 8, wherein the responding to the selection comprises: obtaining size information of the selected part according to the surface depths and the normal direction information; wherein the obtaining of the size information comprises: calculating a variation value of a normal direction from a starting point to an ending point of the selected part; if the variation value is smaller than a preset angle threshold, querying the surface depths and converting the starting point and the ending point into three-dimensional coordinates, and outputting size measurement values in directions in which measurements are needed after coordinate conversion. ### Claim 12 (depends on 8) The method for operating a CT-based three-dimensional image used for security inspection according to claim 8, wherein the responding to the selection comprises: obtaining voxel collections for different objects in the CT-based three-dimensional image used for security inspection by dividing; determining at least one selected object from the voxel collections for different objects based on different preset criteria; and performing statistics on voxel information corresponding to the at least one selected object, and outputting size measurements of the object in a three-dimensional space. ### Claim at position 13 13-19. (canceled) ### Claim 20 A device for operating a CT-based three-dimensional image used for security inspection, comprising: a processor; and a memory for storing instructions executable by the processor; wherein the processor is configured to: provide a CT-based three-dimensional image used for security inspection; accept a selection to select an image of an object in the three-dimensional image; and respond to the selection. ### Claim 21 (depends on 20) The device according to claim 20, wherein the processor is configured to accept a selection to entirely select the image of the object in the three-dimensional image. ### Claim 22 (depends on 21) The device according to claim 21, wherein the processor is configured to accept a single- click selection or a frame selection on the image of the object in the three-dimensional image to entirely select the image of the object. ### Claim 23 (depends on 20) The device according to claim 20, wherein the processor is configured to accept a local selection to locally select the image of the object in the three-dimensional image. ### Claim 24 (depends on 23) The device according to claim 23, wherein the processor is configured to: accept a double-click selection on the image of the object in the three-dimensional image to select a section of the image of the object; or accept a local frame selection on the image of the object in the three-dimensional image to select a local region of the image of the object. ### Claim 25 (depends on 21) The device according to claim 21, wherein the processor is configured to: display one or more of the following pieces of information: an image contour and a three-dimensional size of the image of the selected object, a density, an atomic number, a CT number and a substance state of the selected object, and information indicating whether the object is a hazardous object; and/or if the object is a hazardous object, provide an alert or a notification. ### Claim 26 (depends on 23) The device according to claim 23, wherein the processor is configured to: display one or more the following pieces of information: a size of a local region of the image of the selected object, a density, an atomic number, a CT number and a substance state of the selected object, and information indicating whether the object is a hazardous object; and/or if the object is the hazardous object, provide an alert or a notification.