# US 2021/0344829 A1 · Optimized Exposure Temporal Smoothing For Time-Lapse Mode > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2021/0344829 A1 - Document ID: US20210344829A1 - Status: Published application - Kind: A1 - Application number: 17/378,903 - Filed: 2021-07-19 - Published: 2021-11-04 - Earliest claimed: 2017-09-25 - Assignees: GoPro, Inc. - Applicants: GoPro, Inc. - Inventors: Nicolas Bessou; Romain Gounelle - Web page: https://patentgrep.com/patent/US20210344829A1 ## CPC - H04N 23/743: Bracketing, i.e. taking a series of images with varying exposure conditions - H04N 5/2625: {for obtaining an image which is composed of images from a temporal image sequence, e.g. for a stroboscopic effect (sequence generated by event triggered capturing H04N7/188)} - H04N 23/71: Circuitry for evaluating the brightness variation - H04N 23/73: by influencing the exposure time - H04N 25/589: with different integration times, e.g. short and long exposures - H04N 23/45: for generating image signals from two or more image sensors being of different type or operating in different modes, e.g. with a CMOS sensor for moving images in combination with a charge-coupled device [CCD] for still images - H04N: PICTORIAL COMMUNICATION, e.g. TELEVISION ## Abstract A method for reducing overexposure or underexposure in a time-lapse includes acquiring, using an image capture device, a first frame of the time-lapse using a first exposure setting; and acquiring, using the image capture device, a second frame of the time-lapse. The first frame of the time-lapse is acquired under a first luminance condition. The second frame of the time-lapse is acquired under a second luminance condition that is different from the first luminance condition. The second frame of the time-lapse is acquired using an exposure setting that is determined based on respective exposure settings of one or more preview images obtained between the first frame of the time-lapse and the second frame of the time-lapse. The one or more preview images are not included in the time-lapse. ## Claims ### Claim 1 A method for reducing overexposure or underexposure in a time-lapse, comprising: acquiring, using an image capture device, a first frame of the time-lapse using a first exposure setting, wherein the first frame of the time-lapse is acquired under a first luminance condition; and acquiring, using the image capture device, a second frame of the time-lapse, wherein the second frame of the time-lapse is acquired under a second luminance condition that is different from the first luminance condition, wherein the second frame of the time-lapse is acquired using an exposure setting that is determined based on respective exposure settings of one or more preview images obtained between the first frame of the time-lapse and the second frame of the time-lapse, and wherein the one or more preview images are not included in the time-lapse. ### Claim 2 (depends on 1) The method of claim 1, wherein the first luminance condition is a lower luminance condition than the second luminance condition. ### Claim 3 (depends on 2) The method of claim 2, wherein the first luminance condition corresponds to an indoor luminance condition and the second luminance condition corresponds to an outdoor luminance condition. ### Claim 4 (depends on 2) The method of claim 2, wherein the first luminance condition and the second luminance condition correspond to different indoor luminance conditions. ### Claim 5 (depends on 2) The method of claim 2, wherein the first luminance condition and the second luminance condition correspond to different outdoor luminance conditions. ### Claim 6 (depends on 2) The method of claim 2, wherein the first luminance condition corresponds to a sunny luminance condition and the second luminance condition corresponds to a cloudy luminance condition. ### Claim 7 (depends on 1) The method of claim 1, wherein the first frame is an image of a first scene and the second frame is an image of a second scene that is different from the first scene. ### Claim 8 An imaging device, comprising: a processor configured to: obtain a first frame of a time-lapse using a first exposure setting; set a second exposure setting, wherein the second exposure setting is based on respective exposure settings of one or more preview images obtained after the first frame of the time-lapse and before a second frame of the time-lapse, and wherein the one or more preview images are not included in the time-lapse; and obtain the second frame of the time-lapse using the second exposure setting. ### Claim 9 (depends on 8) The imaging device of claim 8, wherein the first frame of the time-lapse is acquired under a first luminance condition and the second frame of the time-lapse is acquired under a second luminance condition. ### Claim 10 (depends on 9) The imaging device of claim 9, wherein the first luminance condition is a lower luminance condition than the second luminance condition. ### Claim 11 (depends on 10) The imaging device of claim 10, wherein the first luminance condition corresponds to an indoor luminance condition and the second luminance condition corresponds to an outdoor luminance condition. ### Claim 12 (depends on 10) The imaging device of claim 10, wherein the first luminance condition and the second luminance condition correspond to different indoor luminance conditions. ### Claim 13 (depends on 10) The imaging device of claim 10, wherein the first luminance condition and the second luminance condition correspond to different outdoor luminance conditions. ### Claim 14 (depends on 10) The imaging device of claim 10, wherein the first luminance condition corresponds to a sunny luminance condition and the second luminance condition corresponds to a cloudy luminance condition. ### Claim 15 (depends on 10) The imaging device of claim 10, wherein the first frame is an image of a first scene and the second frame is an image of a second scene that is different from the first scene. ### Claim 16 A non-transitory computer-readable storage medium, comprising executable instructions that, when executed by a processor, facilitate performance of operations to reduce overexposure or underexposure in a time-lapse, the operations comprising operations to: obtain a first frame of the time-lapse using a first exposure setting; obtain one or more preview images after obtaining the first frame and before obtaining a second frame of the time-lapse, wherein the one or more preview images are not included in the time-lapse; obtain a second exposure setting based on respective exposure settings of at least some of the one or more preview images; and obtain the second frame of the time-lapse using the second exposure setting. ### Claim 17 (depends on 16) The non-transitory computer-readable storage medium of claim 16, wherein the first frame of the time-lapse is acquired under a first luminance condition and the second frame of the time-lapse is acquired under a second luminance condition. ### Claim 18 (depends on 17) The non-transitory computer-readable storage medium of claim 17, wherein the first luminance condition corresponds to an indoor luminance condition and the second luminance condition corresponds to an outdoor luminance condition. ### Claim 19 (depends on 17) The non-transitory computer-readable storage medium of claim 17, wherein the first luminance condition corresponds to a sunny luminance condition and the second luminance condition corresponds to a cloudy luminance condition. ### Claim 20 (depends on 17) The non-transitory computer-readable storage medium of claim 17, wherein the first frame is an image of a first scene and the second frame is an image of a second scene that is different from the first scene.