Image analysis for

Edge tear analysis

Suspicious hole analysis

Shift analysis

Drift analysis

Hole-position histogram

The following plot shows histograms of hole centroid positions along the width of the piano roll. The blue bars are the raw hole positions in the scan, the red bars show their positions after drift correction. The x-axis labels indicates the pixel position along the width of the image from the bass side to treble side of the roll. Scroll to the right to see histogram positions for more tracker bar positions. Intermediate spaces between tracker bar positions with 0 histogram counts are removed from the plot (otherwise the plot cannot be displayed).