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Try run MSER on the input image, and then plot the results (the blobs), and use that to help diagnose the problem.
https://docs.opencv.org/3.4.1/d3/d28/classcv_1_1MSER.html
Ideally, MSER should be able to detect the text despite the shadow in the image. If that does not work, the parameters might need to be tuned.
