title: Can Google Vision API blacklist characters I know aren't present
body: <p>I'm using google's vision API to convert images with numeric information into text. The results are fairly accurate, though sometimes the API misreads certain numbers as letters. Since I know the data can only contain the numbers 0-9, periods, and commas is there any way to tell the API it should only be looking for those characters in my request to increase the accuracy?</p>