# US 2021/0344855 A1 · Image signal processor, electronic device including image signal processor, and associated methods > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2021/0344855 A1 - Document ID: US20210344855A1 - Status: Published application - Kind: A1 - Application number: 17/377,816 - Filed: 2021-07-16 - Published: 2021-11-04 - Earliest claimed: 2018-08-06 - Assignees: Samsung Electronics Co., Ltd. - Applicants: Samsung Electronics Co., Ltd. - Inventors: Dong-bum CHOI; Hyunyup KWAK; Jaeho LEE; Ildo KIM; Seongwook SONG - Web page: https://patentgrep.com/patent/US20210344855A1 ## CPC - H04N 5/165: {to maintain the black level constant} - G06T 1/20: Processor architectures; Processor configuration, e.g. pipelining - G06T 1/60: Memory management - G06T 5/80: Geometric correction - G06T 5/90: Dynamic range modification of images or parts thereof - H04N 5/20: Circuitry for controlling amplitude response - H04N 5/213: Circuitry for suppressing or minimising impulsive noise (for suppressing or minimising disturbance in image signal generation H04N23/81) - H04N 25/61: the noise originating only from the lens unit, e.g. flare, shading, vignetting or "cos4" - H04N 25/63: applied to dark current - H04N: PICTORIAL COMMUNICATION, e.g. TELEVISION - G06T: IMAGE DATA PROCESSING OR GENERATION, IN GENERAL ## Abstract An image signal processor that generates a display signal receives an input image signal having a first pedestal level from an image sensor, generates a first signal from the input image signal, the first signal including a second pedestal level, the second pedestal level being different from the first pedestal level and being determined in accordance with the first pedestal level and a processing gain of the image signal processor, generates a second signal having the second pedestal level by amplifying the first signal in accordance with the processing gain, generates a third signal having the second pedestal level by removing a noise signal from the second signal; and generates a fourth signal by subtracting the second pedestal level from the third signal. ## Claims ### Claim 1 A method for generating a display signal, the method comprising: receiving an image signal having a first pedestal level; determining a second pedestal level, different from the first pedestal level, in accordance with the first pedestal level and a processing gain of a processor; and generating a first signal from the image signal, the first signal including the second pedestal level. ### Claim 2 (depends on 1) The method as claimed in claim 1, wherein the processing gain is determined based on at least one of a gain for lens shading correction and a gain for white balance correction. ### Claim 3 (depends on 1) The method as claimed in claim 1, wherein the second pedestal level is greater than the first pedestal level. ### Claim 4 (depends on 1) The method as claimed in claim 1, further comprising: generating a second signal having the second pedestal level by amplifying the first signal in accordance with the processing gain; generating a third signal having the second pedestal level by removing a noise signal from the second signal; and generating a fourth signal by subtracting the second pedestal level from the third signal. ### Claim 5 (depends on 4) The method as claimed in claim 4, wherein the first, the second, the third, and the fourth signals are all within a processing bit width of the processor. ### Claim 6 (depends on 4) The method as claimed in claim 4, wherein the second pedestal level is greater than the noise signal. ### Claim 7 (depends on 4) The method as claimed in claim 4, wherein generating the first signal from the image signal includes: generating a first pedestal removal signal by subtracting the first pedestal level from the image signal; generating a range reduction signal in accordance with the first pedestal removal signal and a pedestal gain; and amplifying the range reduction signal in accordance with the processing gain, wherein generating the second signal having the second pedestal level by amplifying the first signal in accordance with the processing gain includes: adding the second pedestal level to the amplified range reduction signal to form the second signal. ### Claim 8 (depends on 7) The method as claimed in claim 7, further comprising: determining the pedestal gain in accordance with a processing bit width of the processor, the first pedestal level, and the processing gain. ### Claim 9 (depends on 7) The method as claimed in claim 7, wherein the pedestal gain is less than 1. ### Claim 10 An image signal processor that generates a display signal, the image signal processor: receiving an input image signal having a first pedestal level from an image sensor; extending the input image signal from m bits to n bits; and generating a first signal from the input image signal, the first signal including a second pedestal level, the second pedestal level being different from the first pedestal level and being determined in accordance with the first pedestal level and a processing gain of the image signal processor. ### Claim 11 (depends on 10) The image signal processor as claimed in claim 10, wherein the processing gain is determined based on at least one of a gain for lens shading correction and a gain for white balance correction. ### Claim 12 (depends on 10) The image signal processor as claimed in claim 10, wherein the image signal processor expands a bit width of the input image signal up to a processing bit width of the image signal processor before generating the first signal. ### Claim 13 (depends on 10) The image signal processor as claimed in claim 10, wherein the image signal processor generates the first signal by: generating a first pedestal removal signal by subtracting the first pedestal level from the input image signal; generating a range reduction signal in accordance with the first pedestal removal signal and a pedestal gain, the pedestal gain being less than 1; and adding the second pedestal level to the range reduction signal. ### Claim 14 (depends on 10) The image signal processor as claimed in claim 10, wherein the image signal processor: generates a second signal having the second pedestal level by amplifying the first signal in accordance with the processing gain; generates a third signal having the second pedestal level by removing a noise signal from the second signal; and generates a fourth signal by subtracting the second pedestal level from the third signal. ### Claim 15 (depends on 14) The image signal processor as claimed in claim 14, wherein the image signal processor extends the fourth signal in accordance with a signal stretching gain calculated based on the second pedestal level and a processing bit width of the image signal processor. ### Claim 16 (depends on 14) The image signal processor as claimed in claim 14, wherein the image signal processor generates the second signal by: generating a second pedestal removal signal by subtracting the second pedestal level from the first signal; amplifying the second pedestal removal signal in accordance with the processing gain; and adding the second pedestal level to the amplified second pedestal removal signal. ### Claim 17 An electronic device, comprising: an image sensor to generate an image signal having a first pedestal level added thereto; an image signal processor that generates a display signal from the image signal; and a controller to control operations of the image sensor and the image signal processor, wherein the image signal processor generates, based on the image signal, a first signal having a second pedestal level, different from the first pedestal level, added thereto, the second pedestal level being determined in accordance with the first pedestal level and a processing gain of the image signal processor. ### Claim 18 (depends on 17) The electronic device as claimed in claim 17, wherein the processing gain is determined based on at least one of a gain for lens shading correction and a gain for white balance correction. ### Claim 19 (depends on 17) The electronic device as claimed in claim 17, wherein the image signal processor: generates a first pedestal removal signal by subtracting the first pedestal level from the image signal; generates a range reduction signal in accordance with the first pedestal removal signal and a pedestal gain, the pedestal gain being less than 1; and generates the first signal by adding the second pedestal level to the range reduction signal. ### Claim 20 (depends on 19) The electronic device as claimed in claim 19, wherein the image signal processor generates a second signal by amplifying the first signal based on the processing gain, wherein the image signal processor generates a third signal by removing a noise signal from the second signal, wherein a magnitude of the noise signal is less than the second pedestal level, and wherein the image signal processor generates a fourth signal by subtracting the second pedestal level from the third signal.