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ÇѱÛÁ¦¸ñ(Korean Title) |
X-ray ¿µ»ó¿¡¼ ±×¸®µå ¾ÆƼÆÑÆ® °³¼±À» À§ÇÑ µ¿Àû ºÐÇÒ ±â¹Ý DCT ±â¹ý |
¿µ¹®Á¦¸ñ(English Title) |
A Dynamically Segmented DCT Technique for Grid Artifact Suppression in X-ray Images |
ÀúÀÚ(Author) |
±èÇü±Ô
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ÀÌÁöÇö
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Hyunggue Kim
Joongeun Jung
Jihyun Lee
Joonhyuk Park
Jisu Seo
Hojoon Kim
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¿ø¹®¼ö·Ïó(Citation) |
VOL 08 NO. 04 PP. 0171 ~ 0178 (2019. 04) |
Çѱ۳»¿ë (Korean Abstract) |
¹æ»ç¼± Áø´Ü¿¡¼ »ê¶õ¼± º¸Á¤ ±×¸®µåÀÇ »ç¿ëÀº ±¼ÀýµÇ´Â ½ÅÈ£¿¡ ÀÇÇÑ ¿µ»óÀÇ ¿Ö°îÀ» ¹æÁöÇÒ ¼ö ÀÖ´Â ÀåÁ¡ÀÌ ÀÖ´Â ¹Ý¸é, X-ray ¿µ»ó¿¡¼ ±×¸®µå ¾ÆƼÆÑÆ®¸¦ ¹ß»ý½ÃÅ°´Â ºÎÀÛ¿ëÀ» ¼ö¹ÝÇÑ´Ù. º» ³í¹®¿¡¼´Â ÀÌ»êÄÚ»çÀκ¯È¯(DCT: discrete cosine transform)À» »ç¿ëÇÏ¿©, ±×¸®µå ¶óÀÎÀ» °³¼±ÇÏ´Â ±â¹ýÀ» Á¦¾ÈÇÑ´Ù. X-ray ¿µ»ó¿¡¼ ±×¸®µå ¶óÀÎÀº ÇÇ»çüÀÇ ÇüÅÂ¿Í ¿µ»óÀÇ ¿µ¿ª¿¡ µû¶ó ¼·Î ´Ù¸¥ Ư¼ºÀ» º¸ÀδÙ. ÀÌ·¯ÇÑ Á¡À» ÇØ°áÇϱâ À§ÇÏ¿© µ¿Àû ºÐÇÒ ±¸Á¶¸¦ ±â¹ÝÀ¸·Î DCT º¯È¯À» Àû¿ëÇÏ°í, °³º° ºÐÇÒº°·Î ÀûÇÕÇÑ ÇÊÅÍÀü´ÞÇÔ¼ö¸¦ ¼³°èÇÏ¿´´Ù. ¼¼ºÎÀûÀ¸·Î ÁÖÆļö ¿µ¿ª µ¥ÀÌÅÍ¿¡ ´ëÇÏ¿© ±×¸®µå ¶óÀÎÀÇ ´ë¿ªÀ» °ËÃâÇÏ´Â ¾Ë°í¸®ÁòÀ» Á¦¾ÈÇÏ¿´À¸¸ç, ÇÊÅÍÀü´ÞÇÔ¼ö·Î Kaiser À©µµ¿ì¿Í Butterworth ÇÊÅ͸¦ Á¶ÇÕÇÑ ÇüÅÂÀÇ ¹êµå½ºÅéÇÊÅÍ(BSF: band stop filter)¸¦ ±¸ÇöÇÏ¿´´Ù. ¶ÇÇÑ ºí·ÎÅ· Çö»óÀ» °³¼±Çϱâ À§ÇÏ¿© ´ÙÁß±¸Á¶ÀÇ ¿µ»óÀ¸·ÎºÎÅÍ Çȼ¿°ªÀ» °áÁ¤ÇÏ´Â ¹æ¹ý·ÐÀ» Á¦½ÃÇÏ¿´´Ù. ÃÑ 140°³ÀÇ ½ÇÁ¦ X-ray ¿µ»óÀ» »ç¿ëÇÑ ½ÇÇè°á°ú·ÎºÎÅÍ Á¦¾ÈµÈ ÀÌ·ÐÀÇ Å¸´ç¼ºÀ» ½ÇÇèÀûÀ¸·Î Æò°¡ÇÏ¿´´Ù.
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¿µ¹®³»¿ë (English Abstract) |
The use of anti-scatter grids in radiographic imaging has the advantage of preventing the image distortion caused by scattered radiation. However, it carries the side effect of leaving artifacts in the X-ray image. In this paper, we propose a grid line suppression technique using discrete cosine transform(DCT). In X-ray images, the grid lines have different characteristics depending on the shape of the object and the area of the image. To solve this problem, we adopt the DCT transform based on a dynamic segmentation, and propose a filter transfer function for each individual segment. An algorithm for detecting the band of grid lines in frequency domain and a band stop filter(BSF) with a filter transfer function of a combination of Kaiser window and Butterworth filter have been proposed. To solve the blocking effects, we present a method to determine the pixel values using multiple structured images. The validity of the proposed theory has been evaluated from the experimental results using 140 X-ray images.
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Å°¿öµå(Keyword) |
¹æ»ç¼± Áø´Ü
ÀǷ῵»óó¸®
±×¸®µå ¾ÆƼÆÑÆ®
ºí·ÎÅ· Çö»ó
ÀÌ»êÄÚ»çÀκ¯È¯
Radiography
Medical Image Processing
Grid Artifacts
Blocking Effect
Discrete Cosine Transform
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ÆÄÀÏ÷ºÎ |
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