发明名称 |
A METHOD FOR AUTOMATICALLY DETECTING OBJECTS OF PREDEFINED SIZE WITHIN AN IMAGE, E.G. A MAMOGRAPHIC IMAGE |
摘要 |
The digital representation of the image is sequentially subjected to the following steps: (i) applying the Fourier transform to the original image; (ii) defining a critical Fourier wavelength equal to the predefined size of the objects; (iii) applying one of the techniques of entropy maximisation or cross-entropy minimisation to the original image to create the new image wherein (a) the amplitudes and the phases of the Fourier components of the new image with wavelengths that are shorter than the critical Fourier wavelength are substantially the same as the amplitudes and the phases of the Fourier components of the original image, and wherein (b) for the amplitudes and the phases of Fourier components having wavelengths that are longer than the critical wavelength, new values are estimated so that either image cross-entropy is minimised or image entropy is maximised. |
申请公布号 |
WO9746971(A1) |
申请公布日期 |
1997.12.11 |
申请号 |
WO1997EP02963 |
申请日期 |
1997.06.03 |
申请人 |
AGFA-GEVAERT NAAMLOZE VENNOOTSCHAP;THE PARTICLE PHYSICS AND ASTRONOMY RESEARCH COUNCI;MILLER, LANCE |
发明人 |
MILLER, LANCE |
分类号 |
G06T7/00;G06T5/00 |
主分类号 |
G06T7/00 |
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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