How to correct a graph in waveform

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A study that involved recording the maxima of contours of a set of images, was intended at generating a line graph. The graph is of an irregular waveform, as shown in the image. I would like to know if there exists any algorithm that can be accessed to generate a normalized wave. Every peak of the wave corresponds to the contraction phase of the heart. [The image shows the irregular graph ][2]

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