# US 2025/0093997 A1 · Projector and method for identifying touch input thereof > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2025/0093997 A1 - Document ID: US20250093997A1 - Status: Published application - Kind: A1 - Application number: 18/742,431 - Filed: 2024-06-13 - Published: 2025-03-20 - Earliest claimed: 2023-09-15 - Assignees: Samsung Electronics Co., Ltd. - Applicants: Samsung Electronics Co., Ltd. - Inventors: Seungik LEE; Jaeyong KIM; Heungsuk KANG; Minsup KIM - Web page: https://patentgrep.com/patent/US20250093997A1 ## CPC - G06F 3/0418: {for error correction or compensation, e.g. based on parallax, calibration or alignment} - G06F 3/03: Arrangements for converting the position or the displacement of a member into a coded form - G06F 3/0421: {by interrupting or reflecting a light beam, e.g. optical touch-screen} - G06F 3/0425: {using a single imaging device like a video camera for tracking the absolute position of a single or a plurality of objects with respect to an imaged reference surface, e.g. video camera imaging a display or a projection screen, a table or a wall surface, on which a computer generated image is displayed or projected (tracking a projected light spot to determine a position on a display surface G06F3/0386)} - H04N 13/363: using image projection screens (volumetric display H04N13/388) - H04N 23/11: for generating image signals from visible and infrared light wavelengths - H04N 23/20: for generating image signals from infrared radiation only - H04N 23/56: provided with illuminating means - H04N 23/71: Circuitry for evaluating the brightness variation - H04N 23/76: by influencing the image signals - H04N 25/61: the noise originating only from the lens unit, e.g. flare, shading, vignetting or "cos4" - G06F: ELECTRIC DIGITAL DATA PROCESSING (computer systems based on specific computational models G06N) - H04N: PICTORIAL COMMUNICATION, e.g. TELEVISION ## Abstract A projector is provided. The projector includes: a projection part including a light source configured to project an image, an infrared emitter comprising circuitry configured to emit infrared ray to a projection area where the image is projected, an infrared camera module including an infrared camera configured to generate an image by photographing the projection area using an image sensor, a memory storing correction data including correction values for correcting brightness of the image, and at least one processor configured to: correct brightness of an image obtained through the infrared camera module using the correction data, and identify whether a touch input for the projected image is entered based on the corrected brightness, wherein the correction data is generated based on first correction data and second correction data, the first correction data includes correction values for correcting a decrease in intensity of the infrared ray according to a distance from the infrared emitter, and the second correction data includes correction values for correcting lens shading. ## Claims ### Claim 1 A projector comprising: a projection part comprising a light source configured to project an image; an infrared emitter comprising circuitry configured to output an infrared ray to a projection area where the image is projected; an infrared camera module comprising an infrared camera configured to generate an image by photographing the projection area using an image sensor; a memory storing correction data including correction values for correcting brightness of the image; and at least one processor configured to: correct brightness of an image obtained through the infrared camera module using the correction data, and identify whether a touch input for the projected image is entered based on the corrected brightness, wherein the correction data is generated based on first correction data and second correction data; wherein the first correction data includes correction values for correcting a decrease in intensity of the infrared ray according to a distance from the infrared emitter; and wherein the second correction data includes correction values for correcting lens shading. ### Claim 2 (depends on 1) The projector as claimed in claim 1, wherein the correction values included in the first correction data are determined based on an intensity of the infrared measured in a plurality of areas in the projection area. ### Claim 3 (depends on 2) The projector as claimed in claim 2, wherein the correction values included in the first correction data include correction values for a plurality of pixels of the image sensor; wherein the correction values for the plurality of pixels of the image sensor include correction values for pixels corresponding to the plurality of areas from among the plurality of pixels and correction values for pixels corresponding to remaining areas; wherein the correction values for pixels corresponding to the plurality of areas include correction values for the plurality of areas; and wherein the correction values for the plurality of areas are determined based on the correction values of the plurality of areas being applied to intensities of a plurality of infrared ray measured in the plurality of areas, and intensities of the plurality of infrared ray to which the correction values are applied become equal to each other. ### Claim 4 (depends on 1) The projector as claimed in claim 1, wherein the second correction data includes correction values for a plurality of pixels of the image sensor; and wherein the correction values of the correction data are based on the correction values of the first correction data and the correction values of the second correction data being multiplied on a pixel-by-pixel basis. ### Claim 5 (depends on 1) The projector as claimed in claim 1, wherein at least one processor is configured to: based on infrared ray output from the infrared emitter being reflected by an object present in the projection area and received by the infrared camera module, obtain pixel values of the plurality of pixels of the image sensor; and correct brightness of the image by applying the correction values included in the correction data to the pixel values, wherein the pixel values include Y component of YUV data. ### Claim 6 (depends on 5) The projector as claimed in claim 5, wherein at least one processor is configured to: identify whether there is an area in the image in which brightness is equal to or greater than a specified value based on the corrected brightness; and based on identifying that there is an area in which brightness is equal to or greater than the specified value, identify that the touch input is entered at a location of the projected image corresponding to the identified area. ### Claim 7 A method of identifying a touch input of a projector, the method comprising: projecting an image; outputting infrared ray to a projection area where the image is projected using an infrared emitter; generating an image by photographing the projection area using an infrared camera module including an infrared camera; correcting brightness of the image obtained through the infrared camera module using the correction data; and identifying whether a touch input for the projected image is entered based on the corrected brightness, wherein the correction data is generated based on first correction data and second correction data; wherein the first correction data includes correction values for correcting a decrease in intensity of the infrared ray according to a distance from the infrared emitter; and wherein the second correction data includes correction values for correcting lens shading. ### Claim 8 (depends on 7) The method as claimed in claim 7, wherein the correction values included in the first correction data are determined based on an intensity of the infrared measured in a plurality of areas in the projection area. ### Claim 9 (depends on 8) The method as claimed in claim 8, wherein the correction values included in the first correction data include correction values for a plurality of pixels of the image sensor; wherein the correction values for the plurality of pixels of the image sensor include correction values for pixels corresponding to the plurality of areas from among the plurality of pixels and correction values for pixels corresponding to remaining areas; wherein the correction values for pixels corresponding to the plurality of areas include correction values for the plurality of areas; and wherein the correction values for the plurality of areas are determined based on the correction values of the plurality of areas being applied to intensities of a plurality of infrared ray measured in the plurality of areas, and the intensities of the plurality of infrared ray to which the correction values are applied become equal to each other. ### Claim 10 (depends on 7) The method as claimed in claim 7, wherein the second correction data includes correction values for a plurality of pixels of the image sensor; and wherein the correction values of the correction data are based on the correction values of the first correction data and the correction values of the second correction data being multiplied on a pixel-by-pixel basis. ### Claim 11 (depends on 7) The method as claimed in claim 7, wherein the correcting brightness of the image comprises: based on infrared ray output from the infrared emitter being reflected by an object present in the projection area and received by the infrared camera module, obtain pixel values of the plurality of pixels of the image sensor; and correct brightness of the image by applying the correction values included in the correction data to the pixel values, wherein the pixel values include Y component of YUV data. ### Claim 12 (depends on 11) The method as claimed in claim 11, wherein the identifying whether a touch input for the projected image is entered comprises: identifying whether there is an area in the image in which brightness is equal to or greater than a specified value based on the corrected brightness; and based on identifying that there is an area in which brightness is equal to or greater than the specified value, identifying that the touch input is entered at a location of the projected image corresponding to the identified area. ### Claim 13 A non-transitory computer-readable medium storing computer instructions that, when executed by at least one processor of a projector, cause the projector to perform operations comprising: projecting an image; outputting infrared ray to a projection area where the image is projected using an infrared emitter; generating an image by photographing the projection area using an infrared camera module including an infrared camera; correcting brightness of the image obtained through the infrared camera module using the correction data; and identifying whether a touch input for the projected image is entered based on the corrected brightness, wherein the correction data is generated based on first correction data and second correction data; wherein the first correction data includes correction values for correcting a decrease in intensity of the infrared ray according to a distance from the infrared emitter; and wherein the second correction data includes correction values for correcting lens shading. ### Claim 14 (depends on 13) The non-transitory computer-readable medium as claimed in claim 13, wherein the correction values included in the first correction data are determined based on an intensity of the infrared ray measured in a plurality of areas in the projection area. ### Claim 15 (depends on 14) The non-transitory computer-readable medium as claimed in claim 14, wherein the correction values included in the first correction data include correction values for a plurality of pixels of the image sensor of the infrared camera module; wherein the correction values for the plurality of pixels of the image sensor include correction values for pixels corresponding to the plurality of areas from among the plurality of pixels and correction values for pixels corresponding to remaining areas; wherein the correction values for pixels corresponding to the plurality of areas include correction values for the plurality of areas; and wherein the correction values for the plurality of areas are determined based on the correction values of the plurality of areas being applied to intensities of a plurality of infrared ray measured in the plurality of areas, and intensities of the plurality of infrared ray to which the correction values are applied become equal to each other. ### Claim 16 (depends on 13) The non-transitory computer-readable medium as claimed in claim 13, wherein the second correction data includes correction values for a plurality of pixels of the image sensor; and wherein the correction values of the correction data are based on the correction values of the first correction data and the correction values of the second correction data being multiplied on a pixel-by-pixel basis. ### Claim 17 (depends on 13) The non-transitory computer-readable medium as claimed in claim 13, wherein the correcting brightness of the image comprises: based on infrared ray output from the infrared emitter being reflected by an object present in the projection area and received by the infrared camera module, obtain pixel values of the plurality of pixels of the image sensor; and correct brightness of the image by applying the correction values included in the correction data to the pixel values, wherein the pixel values include Y component of YUV data. ### Claim 18 (depends on 17) The non-transitory computer-readable medium as claimed in claim 17, wherein the identifying whether a touch input for the projected image is entered comprises: identifying whether there is an area in the image in which brightness is equal to or greater than a specified value based on the corrected brightness; and based on identifying that there is an area in which brightness is equal to or greater than the specified value, identifying that the touch input is entered at a location of the projected image corresponding to the identified area.