fix OverflowError in text_visual func
#14758
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This pull request includes an important change to the
tools/infer/utility.pyfile, specifically in thetext_visualmethod. The change modifies the data type used to create a blank image, ensuring compatibility and correctness in image processing.tools/infer/utility.py: Changed the data type fromnp.int8tonp.uint8in thecreate_blank_imgfunction to correctly handle image data.np.int8is a signed 8-bit integer, meaning it can store values from -128 to 127.np.int8, causing an overflow. When NumPy tries to compute 1 * 255 and store the result (255) in an int8 array, it raises the OverflowError because 255 is out of bounds.