# US 9,438,872 B2 · Projection display system and method for correcting projection region > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 9,438,872 B2 - Document ID: US9438872B2 - Status: Granted - Kind: B2 - Application number: 14/489,480 - Filed: 2014-09-18 - Published: 2016-03-24 - Granted: 2016-09-06 - Earliest claimed: 2014-09-18 - Assignees: Coretronic Corporation - Applicants: Wei-Lun Lin; Jui-Chi Chen; Jyun-Lin Cian - Inventors: Wei-Lun Lin; Jui-Chi Chen; Jyun-Lin Cian - Web page: https://patentgrep.com/patent/US9438872B2 ## CPC - H04N 9/3185: {Geometric adjustment, e.g. keystone or convergence (optical or mechanical adjustment of convergence H04N9/317; using scanning means H04N3/22; optical or mechanical adjustments of projectors not peculiar to the presence of an electronic spatial light modulator G03B21/14)} - H04N 9/3147: {Multi-projection systems (video walls G06F3/1446)} - H04N 9/3179: {Video signal processing therefor} - H04N 9/3188: {Scale or resolution adjustment (scaling in general G06T3/40; resolution modifying circuits for displays in general G09G5/391)} - H04N 9/3194: {including sensor feedback} - G03B 21/13: Projectors for producing special effects at the edges of picture, e.g. blurring - H04N: PICTORIAL COMMUNICATION, e.g. TELEVISION - G03B: APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR (optical parts of such apparatus G02B; photosensitive materials or processes for photographic purposes G03C; apparatus for processing exposed photographic materials G03D) ## Abstract A projection display system and a correcting method are provided. The projection display system includes a plurality of projection devices, an image capturing device, a blending device and computing device. The projection devices are configured to project a plurality of projection regions to a projection surface. The image capturing device is configured to capture an image on the projection surface. The computing device determines locations of the projection regions according to the image captured by the imaging capture device. A display screen of the computing device is configured to display a control interface including a display screen region proportionally corresponding to the projection regions. The computing device dynamically adjusts a projection ratio of an image frame displayed on the projection region by adjusting locations of control points on the display screen region and a space between the control points. ## Claims ### Claim 1 A projection display system, comprising: a plurality of projection devices, respectively configured to project a plurality of projection regions to a projection surface; an image capturing device, configured to capture an image of the projection regions on the projection surface; a computing device coupled to the image capturing device and having a control interface, wherein the computing device is adapted to generate a projection device and image capturing device two-dimensional coordinate array according to the image of the projection regions having a plurality of lattice points captured by the image capturing device and a resolution coordinate of the computing device, and wherein the control interface is configured to set a projection boundary, and the computing device is adapted to generate an image capturing device two-dimensional coordinate array according to the projection boundary; and a blending device, coupled to the projection devices and the computing device, configured to apply the projection device and image capturing device two-dimensional coordinate array and the image capturing device two-dimensional coordinate array to an input image to form a blending image. ### Claim 2 (depends on 1) The projection display system as claimed in claim 1, wherein one of the projection devices is adapted to project the lattice points located in the middle area of a part of the projection regions, another one of the projection devices is adapted to project the lattice points located in the middle area of another part of the projection regions, and the image capturing device is adapted to capture the image having the lattice points. ### Claim 3 (depends on 2) The projection display system as claimed in claim 2, wherein one of the projection devices is adapted to project the lattice points filling the remaining area of the image to a part of the projection regions, another one of the projection devices is adapted to project the lattice points filling the remaining area of the image to another part of the projection regions, and the image capturing device captures the image having the lattice point. ### Claim 4 (depends on 1) The projection display system as claimed in claim 1, wherein the projection boundary is manually set by a user. ### Claim 5 (depends on 1) The projection display system as claimed in claim 1, wherein the image capturing device two-dimensional coordinate array is calculated by the computing device according to the projection boundary and the resolution coordinate of the computing device. ### Claim 6 (depends on 5) The projection display system as claimed in claim 5, wherein the blending device further comprises: a memory unit, configured to store the projection device and image capturing device two-dimensional coordinate array generated by the computing device and the image capturing device two-dimensional coordinate array generated by the computing device; a signal output unit, configured to output an image signal; and an image control unit, coupled to the signal output unit and the memory unit, configured to generate a warped image according to the input image and the projection device and image capturing device two-dimensional coordinate array and the image capturing device two-dimensional coordinate array, and adapted to control the signal output unit to output the warped image. ### Claim 7 (depends on 1) The projection display system as claimed in claim 1, wherein the control interface comprises: a display screen region in the control interface, wherein the computing device is adapted to determine locations of the projection regions according to the image of the projection regions captured by the image capturing device, and the display screen region proportionally corresponds to the projection regions, and wherein a plurality of control points is set on the display screen region, and a projection ratio of an image frame displayed on the projection regions is dynamically adjusted by adjusting locations of the control points and a space between the control points. ### Claim 8 (depends on 1) The projection display system as claimed in claim 1, wherein the control interface is configured to set the projection boundary, and the projection regions are partially overlapped with each other; the computing device is adapted to determine locations of the projection regions according to the image of the projection regions captured by the image capturing device; the control interface has a display screen region, wherein a boundary of an overlapped portion of the projection regions is indicated on the display screen region, and the computing device is adapted to adjust the image frame of the overlapped potion of the projection regions according to the boundary. ### Claim 9 A projection method, comprising: respectively projecting a plurality of projection regions to a projection surface, and capturing the projection regions on the projection surface; generating a projection device and image capturing device two-dimensional coordinate array according to an image of the projection regions having a plurality of lattice points captured by an image capturing device and a resolution coordinate of a computing device; setting a projection boundary in a control interface, and forming an image capturing device two-dimensional coordinate array according to the projection boundary; and applying the projection device and image capturing device two-dimensional coordinate array and the image capturing device two-dimensional coordinate array to an input image to form a blending image. ### Claim 10 (depends on 9) The projection method as claimed in claim 9, wherein the step of respectively projecting the projection regions to the projection surface, and capturing the projection regions on the projection surface comprises: projecting the lattice points located in the middle area of the image, and capturing the image having the lattice points. ### Claim 11 (depends on 10) The projection method as claimed in claim 10, wherein the step of respectively projecting the projection regions to the projection surface, and capturing the projection regions on the projection surface comprises: projecting the lattice points filling the remaining area of the image, and capturing the image having the lattice points. ### Claim 12 (depends on 9) The projection method as claimed in claim 9, wherein the projection boundary is set by a user. ### Claim 13 (depends on 10) The projection method as claimed in claim 10, wherein the image capturing device two-dimensional coordinate array is formed according to the projection boundary and the resolution coordinate of the computing device. ### Claim 14 (depends on 9) The projection method as claimed in claim 9, wherein the step of setting the projection boundary in the control interface comprises: determining locations of the projection regions according to the projection regions, wherein the projection regions are adjacent to or partially overlapped to each other; setting a plurality of control points on a display screen region in the control interface, wherein the display screen region proportionally corresponds to the projection regions; and dynamically adjusting a projection ratio of an image frame displayed on the projection regions by adjusting locations of the control points and a space between the control points. ### Claim 15 (depends on 9) The projection method as claimed in claim 9, wherein determining locations of the projection regions according to the projection regions, wherein the projection regions are partially overlapped to each other; indicating a boundary of an overlapped portion of the projection regions in a display screen region of the control interface, wherein the display screen region proportionally corresponds to the projection regions; and adjusting an image frame of the overlapped portion between the projection regions according to the boundary.