What preprocessing technique can help me to filter the background text noises using matlab...the image is shown below?
This problem is called (ink) bleeding. A popular approach is to separate or segment the document image using graphical models. Relevant papers include:


Document Ink Bleed-Through Removal with Two Hidden Markov Random Fields and a Single Observation Field
User-Assisted Ink-Bleed Reduction
Bleed-through removal in degraded documents
Directed Assistance for Ink-Bleed Reduction in Old Documents
Ink-Bleed Reduction Using Functional Minimization