Internet of Things-Based Ultrasound-Guided Erector Spinae Plane Block Combined with Edaravone Anesthesia in Thoracoscopic Lobectomy

Figure 1

Image edge type and its derivative curve law. (a) Gray cross section-step shape; (b) gray cross section-thin line shape; (c) gray cross section slope gradient; (d) first-order differential-step shape; (e) first-order differential-thin line shape; (f) first-order differential-slope gradient shape; (g) second-order differential-step shape; (h) second-order differential-thin line shape; (i) second-order differential-slope gradient shape.

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