发明名称 |
Edge preservation type image processing device |
摘要 |
An edge preservation type of recursive filter 12 outputs an unsharpened image (i.e., low-frequency components) which is smoothed while preserving an edge of an input image in at least one direction (e.g., a vertical direction of the image). The low-frequency components are compressed into a suitable amount by a LUT 14 provided as low-frequency component compression amount setting means and then output. An arithmetic unit 18 provided as low-frequency component compression means compresses the low-frequency components of the input image by subtracting from the input image the output value from the LUT 14. The edge-preservation-type recursive filter 12 can extract the low-frequency components of the input image with an input time delay corresponding to one line of the input image. Therefore, DRC processing has only a short delay due to image processing and is capable of real-time processing by a small amount of computation. In this way, contrast at a medium-to-fine detail of the image such as a catheter can be improved while preventing occurrence of an artifact such as a black region in the processed image.
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申请公布号 |
US7593588(B2) |
申请公布日期 |
2009.09.22 |
申请号 |
US20050522027 |
申请日期 |
2005.01.21 |
申请人 |
HITACHI MEDICAL CORPORATION |
发明人 |
SUGENO SHUJI;IKEDA SHIGEYUKI;NAKAMURA TADASHI |
分类号 |
A61B6/00;G06K9/00;G06K9/40;G06T5/00;G06T5/20;G06T5/40;G06T5/50;H04N1/409;H04N5/208 |
主分类号 |
A61B6/00 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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