# US 10,771,709 B2 · Evaluation device, evaluation method, and camera system > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 10,771,709 B2 - Document ID: US10771709B2 - Status: Granted - Kind: B2 - Application number: 16/077,531 - Filed: 2017-02-27 - Published: 2019-03-07 - Granted: 2020-09-08 - Earliest claimed: 2016-03-04 - Assignees: Sony Corporation - Applicants: Sony Corporation - Inventors: Koji Kamiya - Web page: https://patentgrep.com/patent/US10771709B2 ## CPC - H04N 23/71: Circuitry for evaluating the brightness variation - H04N 5/20: Circuitry for controlling amplitude response - H04N 17/002: {for television cameras} - H04N 23/633: {for displaying additional information relating to control or operation of the camera} - H04N 23/741: by increasing the dynamic range of the image compared to the dynamic range of the electronic image sensors - H04N: PICTORIAL COMMUNICATION, e.g. TELEVISION ## Abstract It is made such that a user can easily and appropriately evaluate luminance of an HDR video signal. A luminance evaluation value is obtained by processing the HDR video signal. The luminance evaluation value is displayed on a display unit. For example, the HDR video signal is a linear HDR video signal and/or the HDR video signal obtained by performing gradation compression on the linear HDR video signal with a log curve characteristic. For example, the luminance evaluation value includes an average picture level, a high light share ratio, a high light average picture level, a product value of the high light share ratio and the high light average picture level and the like. ## Claims ### Claim 1 An evaluation device comprising: circuitry configured to calculate a luminance evaluation value by processing a high dynamic range video signal; and display the calculated luminance evaluation value on a display unit, wherein, in the processing of the high dynamic range video signal to calculate the luminance evaluation value, the circuitry is configured to (i) calculate the luminance evaluation value before the high dynamic range video signal is subjected to gradation compression processing, (ii) calculate an average value of luminance for an entire screen as the luminance evaluation value based on a ratio obtained by setting a code value corresponding to luminance of 100% as a reference value, (iii) calculate an average value of luminance for an area of a first luminance level or higher as the ratio obtained by setting the code value corresponding to luminance of 100% as the reference value, or (iv) calculate a product value of a proportion of an area of a second luminance level or higher in the entire screen and an average value of luminance for the area of the second luminance level or higher in the entire screen as the luminance evaluation value. ### Claim 2 (depends on 1) The evaluation device according to claim 1, wherein the high dynamic range video signal is a linear high dynamic range video signal, and the circuitry is configured to calculate the average value of the luminance for the entire screen as the luminance evaluation value using the linear high dynamic range video signal. ### Claim 3 (depends on 1) The evaluation device according to claim 1, wherein the circuitry is configured to calculate the average value of the luminance for the entire screen as the luminance evaluation value using the high dynamic range video signal subjected to the gradation compression processing. ### Claim 4 (depends on 3) The evaluation device according to claim 3, wherein the circuitry is configured to calculate the average value of the luminance for the entire screen as the ratio obtained by setting the code value corresponding to luminance of 100% as the reference value. ### Claim 5 (depends on 3) The evaluation device according to claim 3, wherein the circuitry is configured to calculate the average value of the luminance for the entire screen as a converted value to a luminance value before the compression processing is performed. ### Claim 6 (depends on 1) The evaluation device according to claim 1, wherein the high dynamic range video signal is a linear high dynamic range video signal or the high dynamic range video signal subjected to the gradation compression processing, and the circuitry is configured to calculate the luminance evaluation value based on a proportion of an area of second luminance level or higher in the entire screen as the luminance evaluation value using the linear high dynamic range video signal or the high dynamic range video signal subjected to gradation compression processing. ### Claim 7 (depends on 1) The evaluation device according to claim 1, wherein the high dynamic range video signal is a linear high dynamic range video signal, and the circuitry is configured to calculate the average value of the luminance for the area of the first luminance level or higher as the luminance evaluation value using the linear high dynamic range video signal. ### Claim 8 (depends on 1) The evaluation device according to claim 1, wherein the circuitry is configured to calculate the average value of the luminance for the area of the first luminance level or higher as the luminance evaluation value using the high dynamic range video signal subjected to the gradation compression processing. ### Claim 9 (depends on 8) The evaluation device according to claim 8, wherein the circuitry is configured to calculate the average value of the luminance for the area of the first luminance level or higher as the ratio obtained by setting the code value corresponding to luminance of 100% as the reference value. ### Claim 10 (depends on 8) The evaluation device according to claim 8, wherein the circuitry is configured to calculate the average value of the luminance for the area of the first luminance level or higher as a converted value to a luminance value before the compression processing is performed. ### Claim 11 (depends on 1) The evaluation device according to claim 1, wherein the high dynamic range video signal is a linear high dynamic range video signal, and the circuitry is configured to calculate the product value of the proportion of the area of the second luminance level or higher in the entire screen and the average value of the luminance for the area of the second luminance level or higher in the entire screen as the luminance evaluation value using the linear high dynamic range video signal. ### Claim 12 (depends on 1) The evaluation device according to claim 1, wherein the circuitry is configured to calculate the product value of the proportion of the area of the second luminance level or higher in the entire screen and the average value of the luminance for the area of the second luminance level or higher in the entire screen as the luminance evaluation value using the high dynamic range video signal subjected to the gradation compression processing. ### Claim 13 An evaluation method comprising: calculating, by circuitry of an evaluation device, a luminance evaluation value by processing a high dynamic range video signal; and displaying, by the circuitry, the calculated luminance evaluation value on a display unit, wherein wherein the processing the high dynamic range video signal includes (i) calculating the luminance evaluation value before the high dynamic range video signal is subjected to gradation compression processing, (ii) calculating an average value of luminance for an entire screen as the luminance evaluation value based on a ratio obtained by setting a code value corresponding to luminance of 100% as a reference value, (iii) calculating an average value of luminance for an area of a first luminance level or higher as the ratio obtained by setting the code value corresponding to luminance of 100% as the reference value, or (iv) calculating a product value of a proportion of an area of a second luminance level or higher in the entire screen and an average value of luminance for the area of the second luminance level or higher in the entire screen as the luminance evaluation value. ### Claim 14 A camera system comprising: imaging sensor configured to generate a linear high dynamic range video signal; and circuitry configured to calculate a luminance evaluation value by processing a high dynamic range video signal, the high dynamic range video signal being the linear high dynamic range video signal obtained by the imaging sensor and/or obtained by applying gradation compression processing to the linear high dynamic range video signal, and display the calculated luminance evaluation value on a display unit wherein, in the processing of the high dynamic range video signal to calculate the luminance evaluation value, the circuitry is configured to (i) calculate the luminance evaluation value before the high dynamic range video signal is subjected to the gradation compression processing, (ii) calculate an average value of luminance for an entire screen as the luminance evaluation value based on a ratio obtained by setting a code value corresponding to luminance of 100% as a reference value, (iii) calculate an average value of luminance for an area of a first luminance level or higher as the ratio obtained by setting the code value corresponding to luminance of 100% as the reference value, or (iv) calculate a product value of a proportion of an area of a second luminance level or higher in the entire screen and an average value of luminance for the area of the second luminance level or higher in the entire screen as the luminance evaluation value.