IPC분류정보
국가/구분 |
United States(US) Patent
등록
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국제특허분류(IPC7판) |
|
출원번호 |
US-0896624
(2001-06-29)
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우선권정보 |
JP-0191852 (2001-06-25); JP-0197980 (2000-06-30) |
발명자
/ 주소 |
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출원인 / 주소 |
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대리인 / 주소 |
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인용정보 |
피인용 횟수 :
7 인용 특허 :
7 |
초록
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When a single X-ray image is formed by compositing a plurality of partial X-ray images, level differences among partial images are corrected. The level difference values at the boundary portions among partial images are statistically calculated using information of an image captured before the parti
When a single X-ray image is formed by compositing a plurality of partial X-ray images, level differences among partial images are corrected. The level difference values at the boundary portions among partial images are statistically calculated using information of an image captured before the partial images to be corrected, and calculating correction values. An image is corrected using the calculated correction values. A system for calculating the correction values, and a system for correcting the partial images are built and driven independently.
대표청구항
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1. An image processing apparatus comprising:image processing means for successively obtaining a composite image obtained by compositing a plurality of partial images; and correction means for correcting an offset of each of the plurality of partial images, wherein said correction means corrects the
1. An image processing apparatus comprising:image processing means for successively obtaining a composite image obtained by compositing a plurality of partial images; and correction means for correcting an offset of each of the plurality of partial images, wherein said correction means corrects the partial images using information of an image captured before an image to be corrected and a statistical property value of pixel values near a boundary between the partial images, wherein the statistical property value of the pixel values near the boundary is a value obtained by subtracting an expected value of a difference value calculated based on features of image information from difference values between pixel values near the boundary of two partial images that sandwich the boundary therebetween. 2. The apparatus according to claim 1, wherein said correction means corrects the partial images using information of an image acquired in the preceding frame of partial images to be corrected.3. The apparatus according to claim 1, wherein said correction means corrects the partial images of a plurality of images using common image information.4. The apparatus according to claim 3, wherein the common image information is information of one or a plurality of frame images obtained every predetermined number of consecutive images.5. The apparatus according to claim 1, wherein said correction means independently executes a calculation process of correction values used in correction in parallel with a process for correcting the partial images.6. The apparatus according to claim 1, further comprising:a plurality of independent image capture means for capturing the plurality of partial images, wherein said image processing means successively obtains the composite image by compositing the plurality of partial images captured by said independent image capture means. 7. The apparatus according to claim 1, wherein the statistical property value of the level difference values between the partial images is a mode of a plurality of level difference values calculated in association with the boundary between the two partial images.8. The apparatus according to claim 1, wherein the statistical property value of the level difference values between the partial images is an average value of a plurality of level difference values calculated in association with the boundary between the two partial images.9. The apparatus according to claim 1, wherein only a range of pixel values which can guarantee linearity of the partial images is used when calculating the statistical property value of the level difference values between the partial images.10. The apparatus according to claim 1, wherein when boundary portions of the plurality of partial images do not overlap each other, and image data is missing at the boundary portions, said correction means corrects respective partial images, and then generates the missing pixel information by interpolation.11. The apparatus according to claim 1, further comprising:image capture means, made up of a plurality of X-ray sensor panels, for generating a plurality of partial images, wherein said image processing means successively obtains the composite image obtained by compositing the plurality of partial images captured by said image capture means. 12. The apparatus according to claim 11, wherein said correction means corrects on the basis of a statistical property value of pixel values near a boundary between the partial images, and uses only a range of pixel values which can guarantee linearity of the partial images when calculating the statistical property value of the level difference values between the partial images, and the range of pixel values which can guarantee linearity of the partial images is a range excluding pixel values of portions of the X-ray sensor panels which are not irradiated with X-rays, and pixel values of portions of the X-ray sensor panels which are directly irradiated with X-rays which are not transmitted through an object.13. The apparatus according to claim 11, wherein said image capture means generates an image signal proportional to intensities of X-rays which hit the X-ray sensor panel.14. The apparatus according to claim 11, wherein said image capture means generates an image signal proportional to logarithmic values of intensities of X-rays which hit the X-ray sensor panel.15. The apparatus according to claim 1, wherein said correction means corrects the image using information of a plurality of images captured before correction.16. An image processing apparatus comprising:image processing means for compositing plurality of partial images; and correction means for correcting an offset of each of the plurality of partial images, wherein said correction means corrects the partial images on the basis of a statistical property value of pixel values near boundary between the partial images, and wherein the statistical property value of the pixel values near the boundary is a value obtained by subtracting an expected value of a difference value calculated based on features of image information from difference values between pixel values near the boundary of two partial images that sandwich the boundary therebetween. 17. The apparatus according to claim 16, wherein the statistical property value of the level difference values between the partial images is a mode of a plurality of level difference values calculated in association with the boundary between the two partial images.18. The apparatus according to claim 16, wherein the statistical property value of the level difference values between the partial images is an average value of a plurality of level difference values calculated in association with the boundary between the two partial images.19. The apparatus according to claim 16, wherein only a range of pixel values which can guarantee linearity of the partial images is used when calculating the statistical property value of the level difference values between the partial images.20. An image processing method for generating a composite image by correcting a plurality of partial images, comprising:a calculation step of calculating correction values using information of an image captured before an image to be corrected, and a statistical property value of pixel values near a boundary between the partial images, wherein the statistical property value of the pixel values near the boundary is a value obtained by subtracting an expected value of a difference value calculated based on features of image information from difference values between pixel values near the boundary of two partial images that sandwich the boundary therebetween; and a correction step of correcting an image using the calculated correction values. 21. An image processing method for generating a composite image by correcting a plurality of partial images, comprising:a calculation step of calculating a statistical property value of pixel values near boundary between the partial images; and a correction step of correcting an offset of each of the plurality of partial images using the calculated statistical property value, wherein the statistical property value of the pixel values near the boundary is a value obtained by subtracting an expected value of a difference value calculated based on features of image information from difference values between pixel values near the boundary of two partial images that sandwich the boundary therebetween.
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