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Figure 4 | BioMedical Engineering OnLine

Figure 4

From: Automated system for lung nodules classification based on wavelet feature descriptor and support vector machine

Figure 4

CT image transformed from the original to the wavelet domain with the Daubechies db4 wavelet transform: a) CT image at one decomposition level and b) CT image with two decomposition levels. Notice that the coarse sub-bands captures the information related to the lung nodules. The data from each sub-band defines a nodule candidate, and is used in the stage of feature extraction.

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