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Ȩ Ȩ > ¿¬±¸¹®Çå > ±¹³» ³í¹®Áö > Çѱ¹Á¤º¸Ã³¸®ÇÐȸ ³í¹®Áö > Á¤º¸Ã³¸®ÇÐȸ ³í¹®Áö ¼ÒÇÁÆ®¿þ¾î ¹× µ¥ÀÌÅÍ °øÇÐ

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Current Result Document : 18 / 128 ÀÌÀü°Ç ÀÌÀü°Ç   ´ÙÀ½°Ç ´ÙÀ½°Ç

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   Á¤ÁßÀº   ÀÌÁöÇö   ¹ÚÁØÇõ   ¼­Áö¼ö   ±èÈ£ÁØ   Hyunggue Kim   Joongeun Jung   Jihyun Lee   Joonhyuk Park   Jisu Seo   Hojoon Kim  
¿ø¹®¼ö·Ïó(Citation) VOL 08 NO. 04 PP. 0171 ~ 0178 (2019. 04)
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(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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(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.
Å°¿öµå(Keyword) ¹æ»ç¼± Áø´Ü   ÀǷ῵»ó󸮠  ±×¸®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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