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Theoretical Analysis of Power-law Transformation on Images for Text Polarity Detection

arXiv — cs.CV•Wednesday, November 12, 2025 at 5:00:00 AM

The recent publication 'Theoretical Analysis of Power-law Transformation on Images for Text Polarity Detection' addresses the vital role of text polarity detection and binarization in various computer vision applications, such as character recognition. By defining text polarity as the contrast between text and its background, the paper emphasizes its importance in transforming images into binary formats. The authors present a theoretical analysis that reveals an interesting phenomenon regarding maximum between-class variance, which increases for dark text on bright backgrounds and decreases for bright text on dark backgrounds. This finding underscores the necessity of understanding text polarity for effective image analysis and processing, thereby contributing to advancements in computer vision technologies.

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