# US 2026/0087752 A1 · Image generation device and operation assistance system > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2026/0087752 A1 - Document ID: US20260087752A1 - Status: Published application - Kind: A1 - Application number: 19/110,948 - Filed: 2023-09-06 - Published: 2026-03-26 - Earliest claimed: 2022-09-16 - Assignees: Hitachi Construction Machinery Co., Ltd. - Applicants: Hitachi Construction Machinery Co., Ltd. - Inventors: Yusuke NAKAMURA; Keita YAMAGUCHI; Ichirou KAWAMURA; Junichi KUWATA; Hideaki ITO; Hidefumi ISHIMOTO; Kei SATO - Web page: https://patentgrep.com/patent/US20260087752A1 ## CPC - G06T 19/006: {Mixed reality (object pose determination, tracking or camera calibration for mixed reality G06T7/00)} - E02F 9/205: {Remotely operated machines, e.g. unmanned vehicles (E02F3/8866 takes precedence)} - E02F 9/261: {Surveying the work-site to be treated} - E02F 9/264: {Sensors and their calibration for indicating the position of the work tool} - G06F 3/04815: Interaction with a metaphor-based environment or interaction object displayed as three-dimensional [3D], e.g. changing the user viewpoint with respect to the environment or object - G06F 3/04842: Selection of displayed objects or displayed text elements (G06F3/0482 takes precedence) - G06F 3/04845: for image manipulation, e.g. dragging, rotation, expansion or change of colour - G06T 19/00: Manipulating three-dimensional [3D] models or images for computer graphics - G06T: IMAGE DATA PROCESSING OR GENERATION, IN GENERAL - E02F: DREDGING; SOIL-SHIFTING (winning peat E21C49/00) - G06F: ELECTRIC DIGITAL DATA PROCESSING (computer systems based on specific computational models G06N) ## Abstract The present invention aims to provide remote operation support technology that allows a remote operator to easily and quickly grasp the state of a work machine based on its machine information and environment information. The image generation device according to the present invention generates an AR image indicating the machine information and the environment information based on the machine information representing the state of the work machine and the environment information representing the state of the surrounding environment of the work machine, and places the AR image representing the machine information at the position indicated by the machine information or places the AR image representing the environment information at the position indicated by the environment information (see FIG. 4). ## Claims ### Claim 1 An image generation device configured to acquire captured images from an imaging device installed on a work machine and generate images used to assist an operator in remotely controlling the work machine comprising: a machine information acquisition section that acquires machine information representing the state of the work machine from a vehicle sensor installed on the work machine; an environment information acquisition section that acquires environment information representing the state of the surroundings of the work machine from a 3D measurement device and an imaging device installed on the work machine and an AR image generation section that generates an AR image indicating at least one of the machine information and the environment information by superimposing the AR image on the captured image based on the machine information and the environment information, wherein the AR image generation section generates a machine information AR image, which is the AR image representing the machine information to be superimposed on the position corresponding to the part of the work machine indicated by the machine information in the captured image, or generates an environment information AR image, which is the AR image representing the environment information to be superimposed on the position corresponding to the surroundings of the work machine indicated by the environment information in the captured image. ### Claim 2 (depends on 1) The image generation device according to claim 1 further includes a free viewpoint image generation section that generates a free viewpoint image of the work machine from the captured image when viewed from any viewpoint; the AR image generation section generates the machine information AR image or the environment information AR image corresponding to the free viewpoint image. ### Claim 3 (depends on 2) The image generation device according to claim 2 includes a coordinate system processing section that converts coordinate systems; the coordinate system processing section converts the coordinate system of the 3D measurement data measured by the 3D measurement device provided in the work machine to the coordinate system of the imaging device provided in the work machine; the coordinate system processing section further converts the 3D measurement data converted to the coordinate system of the imaging device to the coordinate system of the free viewpoint image generated by the free viewpoint image generation section; the free viewpoint image generation section generates the free viewpoint image by projecting the 3D measurement data converted to the coordinate system of the free viewpoint image onto the free viewpoint image. ### Claim 4 (depends on 1) In the image generation device according to claim 1: the AR image generation section is configured to switch between the machine information, the environment information, or both the machine information and the environment information based on the machine information and the environment information, or according to the selection of the operator operating the work machine. ### Claim 5 (depends on 1) In the image generation device according to claim 1: the AR image generation section generates the AR image in which the drawing attributes of a part of the region are changed so that the part of the region is displayed more prominently than other regions based on the machine information and the environment information. ### Claim 6 (depends on 2) In the image generation device according to claim 2: the free viewpoint image generation section is configured to change the viewpoint in the free viewpoint image based on the machine information and the environment information, or according to the selection of the operator operating the work machine. ### Claim 7 (depends on 1) In the image generation device according to claim 1: the AR image generation section acquires information on whether the work machine is performing a predetermined operation from the vehicle sensor, the 3D measurement device, or the imaging device installed on the work machine; the AR image generation section generates the AR image in which the region corresponding to the predetermined operation is emphasized. ### Claim 8 (depends on 2) In the image generation device according to claim 2: the AR image generation section and the free viewpoint image generation section, according to the operation performed by the work machine; switch between the machine information AR image, the environment information AR image, and both the machine information AR image and the environment information AR image to be superimposed on the captured image, or change the drawing attributes of a part of the region in the AR image to generate the AR image in which the part of the region is emphasized more than other regions, or change the viewpoint by the free viewpoint image. ### Claim 9 (depends on 2) In the image generation device according to claim 2: the AR image generation section and the free viewpoint image generation section acquire information on a predetermined threshold in the machine information or the environment information; the AR image generation section and the free viewpoint image generation section, based on the threshold, switch between the machine information AR image, the environment information AR image, and both the machine information AR image and the environment information AR image to be superimposed on the captured image, or change the drawing attributes of a part of the region in the AR image to generate the AR image in which the part of the region is emphasized more than other regions, or change the viewpoint by the free viewpoint image. ### Claim 10 (depends on 9) In the image generation device according to claim 9: the AR image generation section and the free viewpoint image generation section acquire information on the pressure of the cylinder provided in the work machine from the vehicle sensor as the machine information; the free viewpoint image generation section switches the viewpoint of the free viewpoint image to include at least the cylinder that exceeds the threshold when the pressure exceeds the threshold; along with this, the AR image generation section generates the AR image in which the drawing attributes of the region of the cylinder where the pressure exceeds the threshold are changed to be displayed more prominently than other regions. ### Claim 11 (depends on 9) In the image generation device according to claim 9: the AR image generation section and the free viewpoint image generation section acquire information on the degree of unevenness of the arrival location where the loading vehicle that loads the earth and sand excavated by the work machine is scheduled to arrive from the 3D measurement device or the imaging device as the environment information; the free viewpoint image generation section switches the viewpoint of the free viewpoint image to include at least the arrival location when the degree of unevenness exceeds the threshold; along with this, the AR image generation section generates the AR image in which the drawing attributes of the region of the arrival location are changed to be displayed more prominently than other parts. ### Claim 12 (depends on 9) In the image generation device according to claim 9: the AR image generation section and the free viewpoint image generation section acquire information on the expected weight of the earth and sand on the loading vehicle when the earth and sand excavated by the work machine is transferred to the loading vehicle from the 3D measurement device or the imaging device as the environment information; the free viewpoint image generation section switches the viewpoint of the free viewpoint image to include at least the earth and sand on the loading vehicle when the expected weight exceeds the threshold; along with this, the AR image generation section generates the AR image in which the drawing attributes of the region of the earth and sand on the loading vehicle are changed to be displayed more prominently than other parts. ### Claim 13 (depends on 9) In the image generation device according to claim 9: the AR image generation section and the free viewpoint image generation section acquire information on the distance between the foremost part in the traveling direction of the work machine and the slope existing in the traveling direction of the work machine from the 3D measurement device or the imaging device as the environment information; the AR image generation section or the free viewpoint image generation section calculates the risk of the work machine slipping off the slope based on the distance; the free viewpoint image generation section switches the viewpoint of the free viewpoint image to include at least the edge of the slope when the risk exceeds the threshold; along with this, the AR image generation section generates the AR image in which the drawing attributes of the region of the edge of the slope are changed to be displayed more prominently than other parts. ### Claim 14 (depends on 9) In the image generation device according to claim 9: the AR image generation section and the free viewpoint image generation section acquire information on the movement range when the work machine turns from the vehicle sensor as the machine information; the AR image generation section and the free viewpoint image generation section acquire information on the position of objects existing around the work machine from the 3D measurement device or the imaging device as the environment information; the AR image generation section or the free viewpoint image generation section calculates the risk of collision between the work machine and the object when the work machine turns based on the movement range and the position of the object; the free viewpoint image generation section switches the viewpoint of the free viewpoint image to include at least the movement range when the risk exceeds the threshold; along with this, the AR image generation section generates the AR image in which the drawing attributes of the region of the part where the work machine and the object may collide in the movement range are changed to be displayed more prominently than other parts. ### Claim 15 (depends on 9) In the image generation device according to claim 9: the AR image generation section and the free viewpoint image generation section acquire information on the distance between the front of the work machine and the descending surface existing in front of the work machine from the 3D measurement device or the imaging device as the environment information; the AR image generation section or the free viewpoint image generation section calculates the risk of the work machine excavating below the work machine based on the distance; the free viewpoint image generation section switches the viewpoint of the free viewpoint image to include at least the side of the work machine and the descending surface when the risk exceeds the threshold; along with this, the AR image generation section generates the AR image in which the drawing attributes of the region of the descending surface are changed to be displayed more prominently than other parts. ### Claim 16 (depends on 1) The operation support system for assisting the operation of a work machine comprising: the image generation device according to claim 1, and a display device for displaying the image generated by the image generation device.