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a The camera captured paper ECG record with shadow. Results after binarization (b), skeletonization and character removal (c) and 1-D signal extraction (d) from images with shadow. f–h extraction of 1-D signal from the image with non-uniform illumination shown in (e). Binarized ECG image with undesired lead names (shown in i and k, red box), removal of lead names j, l that avoids distortion in signal extraction
