# US 8,542,273 B2 · Arrangement and method for generating images with expanded dynamics > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 8,542,273 B2 - Document ID: US8542273B2 - Status: Granted - Kind: B2 - Application number: 12/680,146 - Filed: 2008-09-20 - Published: 2010-08-12 - Granted: 2013-09-24 - Earliest claimed: 2007-09-27 - Assignees: Carl Zeiss Meditec AG - Applicants: Uwe Mohrholz; Frank Teige; Detlef Biernat - Inventors: Uwe Mohrholz; Frank Teige; Detlef Biernat - Web page: https://patentgrep.com/patent/US8542273B2 ## CPC - A61B 3/12: for looking at the eye fundus, e.g. ophthalmoscopes (A61B3/13 takes precedence) - A61B 3/135: Slit-lamp microscopes - A61B 3/14: Arrangements specially adapted for eye photography - H04N 23/70: Circuitry for compensating brightness variation in the scene - H04N 23/741: by increasing the dynamic range of the image compared to the dynamic range of the electronic image sensors - A61B: DIAGNOSIS; SURGERY; IDENTIFICATION (usefulness limited to only animals A61D) - H04N: PICTORIAL COMMUNICATION, e.g. TELEVISION ## Abstract An ophthalmic device and an arrangement for generating images with expanded dynamic range and a corresponding method for generating images with expanded dynamic range have at least one beamsplitter, in particular with an asymmetric splitting ratio, and at least two image sensors, wherein the image sensors are reflected into a common imaging beam path by the at least one beamsplitter. ## Claims ### Claim 1 An ophthalmic apparatus for generating an image with expanded dynamic range: comprising at least one beamsplitter; and at least two image sensors; wherein the image sensors are reflected into a common imaging beam path by the at least one beamsplitter; and wherein the apparatus is an ophthalmic device. ### Claim 2 (depends on 1) The ophthalmic apparatus according to claim 1; wherein the image sensors are reflected into a common imaging beam path by the at least one beamsplitter; wherein at least one beamsplitter has an asymmetric or asymmetrically adjustable splitting ratio. ### Claim 3 (depends on 2) The ophthalmic apparatus according to claims 2; wherein the final beamsplitter in the imaging beam path has an asymmetric or asymmetrically adjustable splitting ratio. ### Claim 4 (depends on 1) The ophthalmic apparatus according to claim 1; wherein a control unit which records individual images with different radiant energies by means of the image sensors and generates a total image with expanded dynamic range from the individual images. ### Claim 5 (depends on 4) The ophthalmic apparatus according to claim 4; wherein the control unit records the individual images in an overlapping manner with respect to time. ### Claim 6 (depends on 4) The ophthalmic apparatus according to claim 4; wherein the control unit records all of the individual images simultaneously with identical exposure time. ### Claim 7 (depends on 1) The ophthalmic apparatus according to claim 1; wherein the image sensors have an identical imaging scale and have pixel-identical orientation. ### Claim 8 (depends on 1) The ophthalmic apparatus according to claim 1; wherein every beamsplitter is a neutral splitter with respect to the light color. ### Claim 9 (depends on 1) The ophthalmic apparatus according claim 1; wherein the beam path segments between each of the image sensors and the beamsplitter which reflects the respective image sensor into the imaging beam path are formed without filters. ### Claim 10 (depends on 1) The ophthalmic apparatus according to claim 1; wherein the apparatus is a mydriatic or non-mydriatic fundus camera or a slit lamp. ### Claim 11 A method for generating images with expanded dynamic range by means of an ophthalmic device comprising at least one beamsplitter and at least two image sensors, wherein the image sensors are reflected into a common imaging beam path by the at least one beamsplitter and the following steps are carried out, comprising the steps of: recording individual images with different radiant energies by means of the image sensors; and generating a total image with expanded dynamic range from the individual images. ### Claim 12 (depends on 11) The method according to claim 11; wherein the individual images with different radiant energies are recorded by means of the image sensors simultaneously and with identical exposure times. ### Claim 13 (depends on 12) The method according to claims 12; wherein an ophthalmic device is used the apparatus with asymmetric beamsplitter and image sensors. ### Claim 14 (depends on 13) The method according to claims 13; wherein a mydriatic or non-mydriatic fundus camera or a slit lamp is used as the ophthalmic device. ### Claim 15 A non-transitory computer-readable medium for storing a computer program for generating images with expanded dynamic range by means of an ophthalmic device comprising at least one beamsplitter and at least two image sensors, wherein the image sensors are reflected into a common imaging beam path by the at least one beamsplitter and the following steps are carried out, the computer program performing the steps of: recording individual images with different radiant energies by means of the image sensors; and generating a total image with expanded dynamic range from the individual images.