New method for low vision jpeg medical images enhancement with modified quantization table

Abstract EN

The purpose of this work is to reduce the data volume and to achieve a low bit rate in the digital representation of Low vision medical digital images (X-ray and MRI), without a perceived loss of image quality.

In JPEG compression, it is possible to control the compression ratio and image quality by controlling quantization table values.

Thus an attempt is made to standardize the JPEG quantization table for medical images by statistical methods.

The resulted compressed images show low bit rates with approximately little degradation in their visual quality PSNRf (Peak 'Signal' to Noise Ratio).

Then the resulted quantization table is used as a standard quantization table for enhancement technique in DCT (Discrete Cosine Transform) domain.

The level of enhancement is adjusted by a parameter X which can be setted to any desired level.

The resulted medical images resulted at the output of presented system show high visual quality.