IPC분류정보
국가/구분 |
United States(US) Patent
등록
|
국제특허분류(IPC7판) |
|
출원번호 |
US-0412875
(2003-04-14)
|
우선권정보 |
JP-2002-120261(2002-04-23) |
발명자
/ 주소 |
|
출원인 / 주소 |
|
대리인 / 주소 |
|
인용정보 |
피인용 횟수 :
1 인용 특허 :
5 |
초록
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An image combination device which obtains a wide dynamic range image through combination of at least two images with different light exposure, including a photographing means for photographing an appropriate light exposure image and a different light exposure light image from the appropriate light e
An image combination device which obtains a wide dynamic range image through combination of at least two images with different light exposure, including a photographing means for photographing an appropriate light exposure image and a different light exposure light image from the appropriate light exposure image, a dividing means for dividing a lower frequency region from the appropriate light exposure image on a frequency information of the appropriate light exposure image, a statistic means for calculating a statistics value relating to characteristic values of pixel signals in the lower frequency region, a determining means for determining a pixel signal level to divide pixel signals of the appropriate light exposure image into an appropriate region and a bright or dark region on the statistics value, and a combining means for correcting the appropriate light exposure image and the different light exposure image in tone commensurate with a light exposure ratio thereof and combining the appropriate light exposure image and the different light exposure image on the pixel signal level.
대표청구항
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What is claimed is: 1. An image combination device which obtains a wide dynamic range image through combination of at least two images with different light exposure, comprising: a photographing means for photographing an appropriate light exposure image and a different light exposure light image fr
What is claimed is: 1. An image combination device which obtains a wide dynamic range image through combination of at least two images with different light exposure, comprising: a photographing means for photographing an appropriate light exposure image and a different light exposure light image from the appropriate light exposure image, a dividing means for dividing a lower frequency region from the appropriate light exposure image on a frequency information of the appropriate light exposure image, a statistic means for calculating a statistics value relating to characteristic values of pixel signals in the lower frequency region, a determining means for determining a pixel signal level to divide pixel signals of the appropriate light exposure image into an appropriate region and a bright or dark region on the statistics value, and a combining means for correcting the appropriate light exposure image and the different light exposure image in tone commensurate with a light exposure ratio thereof and combining the appropriate light exposure image and the different light exposure image on the pixel signal level. 2. The image combination device as defined in claim 1, wherein the dividing means, the statistic means and the determining means constitute a threshold value calculating means. 3. The image combination device as defined in claim 1, wherein the dividing means comprises: a pixel signal calculating means for calculating the pixel signals of the appropriate light exposure image, an edge extracting means for calculating edge intensities on the pixel signals of the appropriate light exposure image, and a region extracting means for extracting edge non-existence regions on comparison with the edge intensities and a predetermined value. 4. The image combination device as defined in claim 3, wherein in the pixel signal calculating means, a brightness of each pixel of the appropriate light exposure image is calculated. 5. The image combination device as defined in claim 4, wherein the brightness of each pixel of the appropriate light exposure image is calculated on the equation of Y=0.299×R+0.587×G+0.114×B (Y:brightness, R: red signal brightness, G: green signal brightness, B: blue signal brightness). 6. The image combination device as defined in claim 3, wherein the edge extracting means includes at least one of a Prewitt filter and a Sobel filter. 7. The image combination device as defined in claim 3, wherein in the region extracting means, different identifiers are defined for pixels of the appropriate light exposure image on comparison with the edge intensities and the predetermined value. 8. The image combination device as defined in claim 1, wherein the statistic means comprises: a pixel extracting means for reading out the pixel signals in the lower frequency region of the appropriate light exposure image, an adding means for calculating a histogram of the pixel signals of the appropriate light exposure image, and a smoothing means for averaging the adjacent signal levels of the histogram. 9. The image combination device as defined in claim 8, wherein the determining means comprises: an extremal value detecting means for differentiating the histogram and thus, detecting maximum values and minimum values of the resultant differentiated data, a difference detecting means for detecting differences between the minimum values and the maximum values in the vicinity of their respective minimum values and a comparing means for determining a maximum difference value from the differences between the minimum values and the maximum values. 10. The image combination device as defined in claim 1, further comprising a compensating means for compensating data of the appropriate light exposure image. 11. The image combination device as defined in claim 10, further comprising an input-output controlling means for controlling introduction of the resultant compensated date of the appropriate light exposure image into the dividing means and the statistic means. 12. An image combination device which obtains a wide dynamic range image through combination of at least two images with different light exposure, comprising: a photographing means for photographing an appropriate light exposure image and a different light exposure light image from the appropriate light exposure image, a dividing means for dividing a lower frequency region from the appropriate light exposure image on a frequency information of the appropriate light exposure image, a limiting means for determining a pixel signal level range which is composed of lower or higher pixel signals in brightness than a predetermined value within a range of the different light exposure image corresponding to the lower frequency region of the appropriate light exposure image, and a combining means for correcting the appropriate light exposure image and the different light exposure image in tone commensurate with a light exposure ratio thereof and combining the appropriate light exposure image and the different light exposure image on the pixel signal level. 13. The image combination device as defined in claim 12, wherein the dividing means and the limiting means constitutes a range calculating means. 14. The image combination device as defined in claim 12, wherein the dividing means comprises: a pixel signal calculating means for calculating the pixel signals of the appropriate light exposure image, an edge extracting means for calculating edge intensities on the pixel signals of the appropriate light exposure image, and a region extracting means for extracting edge non-existence regions on comparison with the edge intensities and a predetermined value. 15. The image combination device as defined in claim 14, wherein in the pixel signal calculating means, a brightness of each pixel of the appropriate light exposure image is calculated. 16. The image combination device as defined in claim 15, wherein the brightness of each pixel of the appropriate light exposure image is calculated on the equation of Y=0.299×R+0.587×G+0.114×B (Y:brightness, R: red signal brightness, G: green signal brightness, B: blue signal brightness). 17. The image combination device as defined in claim 14, wherein the edge extracting means includes at least one of a Prewitt filter and a Sobel filter. 18. The image combination device as defined in claim 14, wherein in the region extracting means, different identifiers are defined for pixels of the appropriate light exposure image on comparison with the edge intensities and the predetermined value. 19. The image combination device as defined in claim 12, wherein the limiting means comprises: a setting means to setting a pixel signal level to divide the lower frequency region of the appropriate light exposure image, an adding means for selecting pixels lower or higher in brightness than a predetermined value within a range of the different light exposure image corresponding to the divided region of the appropriate light exposure image and adding the number of the selected pixels, and a judging means for judging whether the added pixel number is within an acceptable range or not. 20. The image combination device as defined in claim 19, wherein in the limiting means, the pixel signal level is varied so that the added pixel number is set within the acceptable range. 21. The image combination device as defined in claim 12, further comprising a compensating means for compensating data of the appropriate light exposure image. 22. The image combination device as defined in claim 21, further comprising an input-output controlling means for controlling introduction of the resultant compensated date of the appropriate light exposure image into the dividing means and the statistic means. 23. An image combination device which obtains a wide dynamic range image through combination of at least two images with different light exposure, comprising: a photographing means for photographing an appropriate light exposure image and a different light exposure light image from the appropriate light exposure image, a dividing means for dividing a lower frequency region from the appropriate light exposure image on a frequency information of the appropriate light exposure image, a limiting means for determining a pixel signal level range which is composed of lower or higher pixel signals in brightness than a predetermined value within a range of the different light exposure image corresponding to the lower frequency region of the appropriate light exposure image, a statistic means for calculating a statistics value relating to characteristic values of pixel signals in the lower frequency region, a determining means for determining a pixel signal level to divide pixel signals of the appropriate light exposure image into an appropriate region and a bright or dark region on the statistics value, and a combining means for correcting the appropriate light exposure image and the different light exposure image in tone commensurate with a light exposure ratio thereof and combining the appropriate light exposure image and the different light exposure image on the pixel signal level. 24. The image combination device as defined in claim 23, wherein the dividing means, the statistic means, the determining means and the limiting means constitute a threshold value calculating means. 25. The image combination device as defined in claim 23, wherein the dividing means comprises: a pixel signal calculating means for calculating the pixel signals of the appropriate light exposure image, an edge extracting means for calculating edge intensities on the pixel signals of the appropriate light exposure image, and a region extracting means for extracting edge non-existence regions on comparison with the edge intensities and a predetermined value. 26. The image combination device as defined in claim 25, wherein in the pixel signal calculating means, a brightness of each pixel of the appropriate light exposure image is calculated. 27. The image combination device as defined in claim 26, wherein the brightness of each pixel of the appropriate light exposure image is calculated on the equation of Y=0.299×R+0.587×G+0.114×B (Y:brightness, R: red signal brightness, G: green signal brightness, B: blue signal brightness). 28. The image combination device as defined in claim 25, wherein the edge extracting means includes at least one of a Prewitt filter and a Sobel filter. 29. The image combination device as defined in claim 25, wherein in the region extracting means, different identifiers are defined for pixels of the appropriate light exposure image on comparison with the edge intensities and the predetermined value. 30. The image combination device as defined in claim 23, wherein the statistic means comprises: a pixel extracting means for reading out the pixel signals in the lower frequency region of the appropriate light exposure image, an adding means for calculating a histogram of the pixel signals of the appropriate light exposure image, and a smoothing means for averaging the adjacent signal levels of the histogram. 31. The image combination device as defined in claim 23, wherein the determining means comprises: an extremal value detecting means for differentiating the histogram and thus, detecting maximum values and minimum values of the resultant differentiated data, a difference detecting means for detecting differences between the minimum values and the maximum values in the vicinity of their respective minimum values and a comparing means for determining a maximum difference value from the differences between the minimum values and the maximum values. 32. The image combination device as defined in claim 23, wherein the limiting means comprises: a setting means to setting a pixel signal level to divide the lower frequency region of the appropriate light exposure image, an adding means for selecting pixels lower or higher in brightness than a predetermined value within a range of the different light exposure image corresponding to the divided region of the appropriate light exposure image and adding the number of the selected pixels, and a judging means for judging whether the added pixel number is within an acceptable range or not. 33. The image combination device as defined in claim 32, wherein in the limiting means, the pixel signal level is varied so that the added pixel number is set within the acceptable range. 34. The image combination device as defined in claim 23, further comprising a compensating means for compensating data of the appropriate light exposure image. 35. The image combination device as defined in claim 34, further comprising an input-output controlling means for controlling introduction of the resultant compensated date of the appropriate light exposure image into the dividing means and the statistic means.
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