3/5/2023 0 Comments My scannerFor instance, to effectively use barcode optical character recognition (OCR), you may need a higher contrast than normal. Things to Consider Before Tuning Your Scannerīefore tuning your scanner you need to consider the type of scanning you’re doing and what your needs are. Changing it from 128 to 90 is a good place to start. Threshold can be a little confusing – just remember that a lower number = more dark, so to make the scanner not see colored paper, lower the number. This is the key parameter of tuning out colored paper. The higher the number, the darker the object must be to register. THRESHOLD: Defines the darkness level an object must be to register on the scanned image. found on the page, so increase it carefully. and noise A random, unwanted fluctuation of pixel values in an image. Too much contrast can increase artifacts A structure or feature not normally present but visible as a result of an external agent, such as a line or other distortion on a scanned image. Increasing the contrast can make objects on the scanned page stand out more, thus contrast is desirable for barcode scanning / OCR applications. By increasing brightness, you can actually discard objects on the scanned image.ĬONTRAST: Refers to the range between the darkest pixel and the lightest pixel in an image. Increasing the resolution increases the size of the image.īRIGHTNESS: Controls the balance of light and dark shades in your image. Typically, you should not have to go higher than this DPI – even for OCR needs. RESOLUTION: 300 X 300 DPI is the normal recommended resolution setting. These settings interact with, and sometimes counteract each other, so start with something simple and refine the settings as needed. Tune the following four settings to suit your specific needs. Most tuning efforts usually end up being a trade-off between image size and quality/clarity. Sometimes tuning is done via a software package on the client PC, and sometimes it's done with programmable buttons on the scanning device itself. Most commercial scanners have the ability to be adjusted to suit the types of scanning being done.
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