Image processing apparatus, method, and computer program with pixel brightness-change detection and value correction
First Claim
1. An image processing apparatus comprising:
- a processor configured to;
receive input image data comprising a long-time exposure image and a short-time exposure image;
detect a brightness-change pixel in which it is determined that a brightness change has occurred during a photographic period corresponding to a long-time exposure time on the basis of analysis of pixel values in the long-time exposure image and the short-time exposure image; and
correct a pixel value of the brightness-change pixel detected by the image analysis unit, wherein the pixel value correction includes;
selectively combining pixel values in the long-time exposure image and pixel values in the short-time exposure image to generate a combined image,generating an intermediate image, the intermediate image being a blurred image of the combined image, anddetermining a pixel value of the brightness-change pixel using a pixel value of a corresponding pixel in the combined image and a pixel value of a corresponding pixel in the intermediate image, the corresponding pixels in the combined and intermediate images being located at positions corresponding to the brightness-change pixel.
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Abstract
An image processing apparatus includes the following elements. An image input unit receives a long-time exposure image and a short-time exposure image. An image analysis unit detects a brightness-change pixel in which a brightness change has occurred during a photographic period on the basis of analysis of pixel values in the long-time exposure image and the short-time exposure image. A pixel value correction unit corrects a pixel value of the detected brightness-change pixel. In the pixel value correction unit, a combined image generator selectively combines pixel values in the long-time exposure image and pixel values in the short-time exposure image to generate a combined image; an intermediate image generator generates a blurred image of the combined image; and an output image generator determines a pixel value of the detected brightness-change pixel using a pixel value of a corresponding pixel in each of the combined image and the blurred image.
46 Citations
27 Claims
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1. An image processing apparatus comprising:
a processor configured to; receive input image data comprising a long-time exposure image and a short-time exposure image; detect a brightness-change pixel in which it is determined that a brightness change has occurred during a photographic period corresponding to a long-time exposure time on the basis of analysis of pixel values in the long-time exposure image and the short-time exposure image; and correct a pixel value of the brightness-change pixel detected by the image analysis unit, wherein the pixel value correction includes; selectively combining pixel values in the long-time exposure image and pixel values in the short-time exposure image to generate a combined image, generating an intermediate image, the intermediate image being a blurred image of the combined image, and determining a pixel value of the brightness-change pixel using a pixel value of a corresponding pixel in the combined image and a pixel value of a corresponding pixel in the intermediate image, the corresponding pixels in the combined and intermediate images being located at positions corresponding to the brightness-change pixel. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. An imaging apparatus comprising:
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an imaging device configured to generate, by a processor, image data comprising a long-time exposure image and a short-time exposure image, wherein the processor is configured to; detect a brightness-change pixel in which it is determined that a brightness change has occurred during a photographic period corresponding to a long-time exposure time on the basis of analysis of pixel values in the long-time exposure image and the short-time exposure image; and correct a pixel value of the brightness-change pixel detected by the image analysis unit, wherein the correcting a pixel value includes; selectively combining pixel values in the long-time exposure image and pixel values in the short-time exposure image to generate a combined image, generating an intermediate image, the intermediate image being a blurred image of the combined image, and determining a pixel value of the brightness-change pixel detected by the image analysis unit using a pixel value of a corresponding pixel in the combined image and a pixel value of a corresponding pixel in the intermediate image, the corresponding pixel in the combined and intermediate images being located at positions corresponding to the brightness-change pixel. - View Dependent Claims (14)
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15. An image processing method for performing image processing in an image processing apparatus, the image processing method comprising the steps of:
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by an image input unit, receiving a long-time exposure image and a short-time exposure image; by an image analysis unit, detecting a brightness-change pixel in which it is determined that a brightness change has occurred during a photographic period corresponding to a long-time exposure time on the basis of analysis of pixel values in the long-time exposure image and the short-time exposure image; and by a pixel value correction unit, correcting a pixel value of the detected brightness-change pixel, wherein the step of correcting includes the steps of generating a combined image by selectively combining pixel values in the long-time exposure image and pixel values in the short-time exposure image, generating an intermediate image, the intermediate image being a blurred image of the combined image, and determining a pixel value of the brightness-change pixel detected by the image analysis unit using a pixel value of a corresponding pixel in the combined image and a pixel value of the corresponding pixel in the intermediate image, the corresponding pixel in the combined and intermediate images being located at positions corresponding to the brightness-change pixel. - View Dependent Claims (16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26)
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27. A non-transitory computer storage medium comprising a computer program for causing an image processing apparatus to execute image processing, the computer program comprising the steps of:
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causing an image input unit to receive a long-time exposure image and a short-time exposure image; causing an image analysis unit to detect a brightness-change pixel in which it is determined that a brightness change has occurred during a photographic period corresponding to a long-time exposure time on the basis of analysis of pixel values in the long-time exposure image and the short-time exposure image; and causing a pixel value correction unit to correct a pixel value of the brightness-change pixel detected in the step of causing an image analysis unit to detect a brightness-change pixel, wherein the step of causing a pixel value correction unit to correct a pixel value includes the steps of generating a combined image by selectively combining pixel values in the long-time exposure image and pixel values in the short-time exposure image, generating a blurred image of the combined image, and generating an output image by determining a pixel value of the brightness-change pixel detected by the image analysis unit using a pixel value of a corresponding pixel in the combined image and a pixel value of the corresponding pixel in the intermediate image, the corresponding pixel in the combined and intermediate images being located at positions corresponding to the brightness-change pixel.
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Specification