Image processing method and apparatus
AssigneesSamsung Electronics Co., Ltd., Industry-Academic Cooperation Foundation, Yonsei University
InventorsHwiryong JUNG, Moon Gi KANG, Seung Hoon JEE, Min Sub KIM, Wooshik KIM, Hyewon MOON, Keechang LEE, Sunghoon HONG
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Abstract
An image processing method acquires an image, restores a saturated region in which a pixel in the image has a first reference value based on a first illuminance component of the image, enhances a dark region in which a value of a pixel in the image is less than a second reference value based on the restored saturated region and the first illuminance component, and outputs a dark region-enhanced image.
Claims24
An image processing method, comprising:
- acquiring an image;
- restoring a saturated region in which a first pixel in the image has a first reference value based on a first illuminance component of the image;
- enhancing a dark region in which a value of a second pixel in the image is less than a second reference value based on the restored saturated region and the first illuminance component;
- and
- outputting a dark region-enhanced image.
An image processing apparatus, comprising:
- a processor configured to restore a saturated region in which a first pixel in an image has a first reference value based on a first illuminance component of the image, and to enhance a dark region in which a value of a second pixel in the image is less than a second reference value based on the restored saturated region and the first illuminance component;
- and
- a communication interface configured to acquire the image and to output a dark region-enhanced image.
An image processing apparatus, comprising:
- a sensor configured to acquire an image;
- one or more processors comprising
- a cumulative distribution function (CDF) obtainer configured to set pixel values of a dark region in the image as an offset and to remove the offset from the image,
- a first illuminance component obtainer configured to estimate a first illuminance component based on the offset-removed image,
- a saturated pixel restorer configured to restore a saturated region of the offset-removed image in which a pixel has a first reference value based on a pixel value of a subpixel having a lowest sensitivity among red (R), green (G), and blue (B) subpixels of each of pixels in the image and the first illuminance component,
- a dark spot enhancer configured to enrich a dark region of the saturated region-restored image based on an over curve, determine an increment of each of pixel values of a dark region-enriched image relative to each of pixel values of the image, and to enhance the dark region by adjusting the increment of a pixel relative to a neighboring pixel based on the first illuminance component,
- a second illuminance component obtainer configured to acquire a second illuminance component from the dark region-enhanced image, and
- a contrast enhancer configured to adjust a local contrast of the dark region-enhanced image using a histogram equalization (HE) based local curve, and to adjust a global contrast of the dark region-enhanced image by readjusting the local curve based on the second illuminance component;
- and
- a display configured to output a dark region-enhanced image.
Dependencies are inferred from the claim text.