Fig. 2From: Tongue image quality assessment based on a deep convolutional neural networkGood-quality versus poor-quality tongue images. a Good-quality tongue images; b–h poor-quality tongue images: b overexposed tongue images; c underexposed tongue images; d blurry tongue images; e tongue images with light leakage; f foggy tongue images; g stained tongue images or tongue coating; h tongue images with unsuitable posture.Back to article page