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US 12,217,399 B2Granted
Tone mapping circuit, image sensing device and operation method thereof
AssigneeSK hynix Inc.
InventorChang Ki Min
Life of this patent
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Abstract
A tone mapping circuit includes: a tone mapping unit suitable for generating a corrected color image by correcting an input image corresponding to pixel data provided from a pixel array; and a noise removing unit suitable for calculating a deviation of the input image based on the input image and the corrected color image, and removing noise from the corrected color image to generate a new output image.
Claims11
A tone mapping circuit, comprising:
- a tone mapping component configured to generate a corrected color image by correcting pixel data representing an input image provided from a pixel array;
- and
- a noise removing component configured to calculate a deviation of the input image and remove a noise from the corrected color image, based on the input image and the corrected color image, to generate an output image,
- wherein the noise removing component calculates the deviation by calculating a mean value of the pixel data,
- wherein the noise removing component is further suitable for calculating a mean value of the corrected color image, and
- wherein the noise removing component removes the noise from the corrected color image by adding the deviation of the input image to the mean value of the corrected color image.
3 more elements
A tone mapping circuit, comprising:
- a first tone mapping component configured to generate a primarily corrected color image by correcting pixel data representing an input image provided from a pixel array;
- and
- a second tone mapping component configured to generate a secondarily corrected color image by secondarily correcting the primarily corrected color image based on the input image and the primarily corrected color image,
- wherein the second tone mapping component is further configured to:
- calculate a mean value of the pixel data,
- calculate a deviation of the input image, and
- calculate a mean value of the primarily corrected color image, and
- wherein the second tone mapping circuit generates the secondarily corrected color image by adding the deviation of the input image to the mean value of the primarily corrected color image.
5 more elements
A method for driving an image sensing device, comprising:
- generating a corrected color image based on a weight matrix and pixel data representing an input image provided from a pixel array;
- and
- generating an output image by removing a noise from the corrected color image based on the input image and the corrected color image,
- wherein the generating the output image includes:
- calculating a mean value of the pixel data;
- calculating a deviation of the input image by subtracting the mean value of the pixel data from each piece of the pixel data;
- calculating a mean value of the corrected color image;
- and
- removing the noise from the corrected color image by adding the deviation of the input image to the mean value of the corrected color image.
6 more elements
An operating method of a tone mapping circuit, the operating method comprising:
- generating a corrected array of pixel data based on a weight matrix and an original array of the pixel data;
- calculating mean values of the respective original and corrected arrays;
- generating a deviation array of the original array by subtracting the mean value of the original array from respective data pieces within the original array;
- and
- generating an output array of the pixel data by summing the mean value of the corrected array to the deviation array and removing a noise from the corrected array.
2 more elements
Dependencies are inferred from the claim text.