Image processor, electronic device including image processor, and image processing method for performing stepped tone correction on images
AssigneeFujitsu Semiconductor Limited
InventorNobuaki Sekine
Life of this patent
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Abstract
An image processor includes a first correction circuit that outputs a first correction value, which corresponds to a pixel value of an input image, based on a first correction characteristic. A second correction circuit outputs a second correction value, which corresponds to the pixel value of the input image, based on a second correction characteristic. A control circuit controls a ratio for mixing the first correction value and the second correction value. A mixing circuit that mixes the first correction value and the second correction value based on the ratio. A corrected pixel value, which corresponds to the pixel value of the input image, is generated in accordance with an output value of the mixing circuit.
Claims9
An image processor comprising:
- a first correction circuit that outputs a first correction value, which corresponds to a pixel value of an input image, based on a first correction characteristic;
- a second correction circuit that outputs a second correction value, which corresponds to the pixel value of the input image, based on a second correction characteristic;
- a control circuit that controls a ratio for mixing the first correction value and the second correction value, wherein the control circuit is configured to change the ratio in a plurality of stages and includes a table that stores the ratio at each of the stages and a number of frames of the input image in association with the ratio;
- and
- a mixing circuit that mixes the first correction value and the second correction value based on the ratio, wherein the mixing circuit is configured to mix the first correction value and the second correction value at the same ratio for the input image corresponding to the number of frames, and wherein a corrected pixel value, which corresponds to the pixel value of the input image, is generated in accordance with an output value of the mixing circuit.
An electronic device comprising:
- an image processor that corrects a pixel value of an input image and generates a corrected pixel value, wherein the image processor includes:
- a first correction circuit that outputs a first correction value, which corresponds to the pixel value of the input image, based on a first correction characteristic;
- a second correction circuit that outputs a second correction value, which corresponds to the pixel value of the input image, based on a second correction characteristic;
- a control circuit that controls a ratio for mixing the first correction value and the second correction value, wherein the control circuit is configured to change the ratio in a plurality of stages and includes a table that stores the ratio at each of the stages and a number of frames of the input image in association with the ratio;
- and
- a mixing circuit that mixes the first correction value and the second correction value based on the ratio, wherein the mixing circuit is configured to mix the first correction value and the second correction value at the same ratio for the input image corresponding to the number of frames.
A method for processing an image, the method comprising:
- generating a first correction value, which corresponds to a pixel value of an input image, based on a first correction characteristic;
- generating a second correction value, which corresponds to the pixel value of the input image, based on a second correction characteristic;
- controlling a ratio for mixing the first correction value and the second correction value, wherein the controlling includes changing the ratio in a plurality of stages by reference to a table, the table storing the ratio at each of the stages and a number of frames of the input image in association with the ratio;
- obtaining a mixed value of the first correction value and the second correction value based on the ratio, wherein the obtaining includes mixing the first correction value and the second correction value at the same ratio for the input image corresponding to the number of frames;
- and
- generating a corrected pixel value, which corresponds to the pixel value of the input image, in accordance with the mixed value.
Dependencies are inferred from the claim text.