# US 2019/0318449 A1 · Imaging method and apparatus for virtual reality device, and virtual reality device > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2019/0318449 A1 - Document ID: US20190318449A1 - Status: Published application - Kind: A1 - Application number: 16/425,226 - Filed: 2019-05-29 - Published: 2019-10-17 - Earliest claimed: 2016-12-07 - Assignees: GoerTek Techno!ogy Co., Ltd. - Applicants: GoerTek Techno!ogy Co., Ltd. - Inventors: Ming Wang - Web page: https://patentgrep.com/patent/US20190318449A1 ## CPC - G06T 3/08: Projecting images onto non-planar surfaces, e.g. geodetic screens - G06T 5/80: Geometric correction - G06T 19/006: {Mixed reality (object pose determination, tracking or camera calibration for mixed reality G06T7/00)} - G06T 2200/04: involving 3D image data - G06T 2200/08: involving all processing steps from image acquisition to 3D model generation - G06T: IMAGE DATA PROCESSING OR GENERATION, IN GENERAL ## Abstract An imaging method for a virtual reality device, and a virtual reality device are provided. The method comprises: acquiring an image; calculating the radius of a minimum inscribed circle of the image ; calculating a distortion ratio at the minimum inscribed circle according to the radius and a selected distortion formula; enlarging the image by using the calculated distortion ratio as an enlargement ratio; distorting the enlarged image according to the distortion formula; and outputting the distortion processed image to a screen for displaying. ## Claims ### Claim 1 An imaging method for a virtual reality device, comprising: acquiring an image by at least one sensor; calculating, by a processor in communication with the sensor, the radius of a minimum inscribed circle of the image; calculating, by the processor, a distortion ratio at the minimum inscribed circle according to the radius and a selected distortion formula; enlarging the image by using the calculated distortion ratio as an enlargement ratio; distortion processing, by the processor, the enlarged image according to the distortion formula; and outputting the distortion processed image to a screen for display. ### Claim 2 (depends on 1) The imaging method according to claim 1, wherein the calculating the radius of a minimum inscribed circle of the image comprises: when the aspect ratio of the image is 1, calculating the radius to be equal to a distance from a midpoint of any side of the image to a geometric center of the image. ### Claim 3 (depends on 2) The imaging method according to claim 2, further comprising: judging whether the aspect ratio of the image is consistent with the aspect ratio of the screen before enlarging the image, if not, and then: keeping the size of the image unchanged, and compressing the content of the image according to the aspect ratio of the image and the aspect ratio of the screen, so that the content of the image is displayed on the screen in an original ratio. ### Claim 4 (depends on 3) The imaging method according to claim 3, wherein the compressing the content of the image according to the aspect ratio of the image and the aspect ratio of the screen comprises: when the aspect ratio of the image is 1 and the aspect ratio of the screen is greater than 1, keeping the height of the content of the image unchanged and compressing the width of the content of the image according to the reciprocal of the aspect ratio of the screen; and when the aspect ratio of the image is 1 and the aspect ratio of the screen is less than 1, keeping the width of the content of the image unchanged and compressing the height of the content of the image according to the aspect ratio of the screen. ### Claim 5 (depends on 1) The imaging method according to claim 1, wherein the distortion formula is: β=K0+K1×r+K2×r2+K3×r3+K4×r4+K5×r5+K6×r6, wherein K0 to K6 are real coefficients, and β is a distortion ratio of a pixel point on the image, a distance from which to a geometric center of the image is r. ### Claim 6 A virtual reality device, comprising: sensor configured to acquire an image; at least one processor, operatively coupled to the sensor, and adapted to: calculate the radius of a minimum inscribed circle of the image; calculate a distortion ratio at the minimum inscribed circle as an enlargement ratio of the image according to the radius and a selected distortion formula; to enlarge the image according to the enlargement ratio provided by the ratio calculating module; and a distortion process the enlarged image according to the distortion formula to thereby generate a processed image; and a display, operatively coupled to the processor, to display the distortion processed image. ### Claim 7 (depends on 6) The virtual reality device according to claim 6, wherein the radius calculating module is further configured to: when the aspect ratio of the image is 1, calculate the radius to be equal to a distance from a midpoint of any side of the image to a geometric center of the image. ### Claim 8 (depends on 6) The virtual reality device according to claim 6, wherein the processor is further adapted to: judge whether the aspect ratio of the image is consistent with the aspect ratio of the screen before the enlargement processing module enlarges the image, and output a judging result; and when the judging result is the aspect ratio of the image is not consistent with the aspect ratio of the screen, keep the size of the image unchanged, compress the content of the image according to the aspect ratio of the image and the aspect ratio of the screen, such that the content of the image is displayed on the screen in an original ratio. ### Claim 9 (depends on 8) The virtual reality device according to claim 8, wherein the processor is further configured to: when the aspect ratio of the image is 1 and the aspect ratio of the screen is greater than 1, keep the height of the content of the image unchanged and compress the width of the content of the image according to the reciprocal of the aspect ratio of the screen; and when the aspect ratio of the image is 1 and the aspect ratio of the screen is less than 1, keep the width of the content of the image unchanged and compress the height of the content of the image according to the aspect ratio of the screen. ### Claim 10 (canceled) ### Claim 11 (canceled) ### Claim 12 (depends on 1) A computer readable storage medium, storing instructions configured to perform the imaging method according to claim 1. ### Claim 13 (depends on 7) The virtual reality device according to claim 7, wherein the processor is further configured to: judge whether the aspect ratio of the image is consistent with the aspect ratio of the screen before the enlargement processing module enlarges the image, and output a judging result; and when the judging result is the aspect ratio of the image is not consistent with the aspect ratio of the screen, keep the size of the image unchanged, compress the content of the image according to the aspect ratio of the image and the aspect ratio of the screen such that the content of the image is displayed on the screen in an original ratio.