Figure 4From: Automated system for lung nodules classification based on wavelet feature descriptor and support vector machine 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.Back to article page