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Fig. 4 | EURASIP Journal on Advances in Signal Processing

Fig. 4

From: Classification of audio signals using spectrogram surfaces and extrinsic distortion measures

Fig. 4

Flattening surfaces and measuring the resultant geometrical distortions, attained as shape descriptors. The process is visualized for the MIPS distortion energy, defined by (7). We first use ABCD algorithm [2], initialized with Tutte embedding, to map the triangulated surfaces into the plane. We then compute the Jacobian singular values \(\sigma _1(t)\) and \(\sigma _2(t)\) over each mesh triangle t. Finally, we compute for each distortion measure \(E(\sigma _1,\sigma _2)\) and mapping f the two quantities \(E_1(f)\) and \(E_2(f)\), defined according to (11) and (14)

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