Remove brightness normalization function and update preprocessing pipeline to directly use normalized image data

Refactor preprocessing pipeline to include brightness normalization and streamline image processing

Refactor preprocessing pipeline to streamline image processing and remove unused background removal logic

Refactor preprocessing pipeline to integrate image background removal and resizing functionality

Refactor image processing by removing the process_image function and integrating its logic into the preprocessing pipeline

Implement image processing function to remove background and resize images in preprocessing pipeline

Remove background processing from preprocessing pipeline

Implement background removal using GrabCut algorithm in preprocessing pipeline

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