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使用标准直方图均衡或 CLAHE（对比度有限自适应直方图均衡）提高图像对比度。 CLAHE 适用于局部图块，以便在光照不均匀的图像上获得更好的效果。
通过直方图均衡或 CLAHE 提高低对比度照片、扫描和 CV 输入的局部和全局对比度。
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Histogram equalization redistributes pixel intensities so the histogram spans the full range (0–255). This improves contrast, especially in images that are too dark or too bright.
CLAHE (Contrast Limited Adaptive Histogram Equalization) applies equalization locally on tiles rather than globally. It prevents over-amplification of noise by clipping the histogram, producing more natural-looking results.
Use standard equalization for uniformly lit images. Use CLAHE for images with uneven lighting, shadows, or when you want to preserve local detail without over-boosting contrast.