{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2025,5,14]],"date-time":"2025-05-14T02:29:30Z","timestamp":1747189770034,"version":"3.40.5"},"reference-count":44,"publisher":"World Scientific Pub Co Pte Ltd","issue":"14","content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Int. J. Patt. Recogn. Artif. Intell."],"published-print":{"date-parts":[[2020,12,30]]},"abstract":"<jats:p> The human emotion recognition based on facial expression has a significant meaning in the application of intelligent man\u2013machine interaction. However, the human face images vary largely in real environments due to the complex backgrounds and luminance. To solve this problem, this paper proposes a robust face detection method based on skin color enhancement model and a facial expression recognition algorithm with block principal component analysis (PCA). First, the luminance range of human face image is broadened and the contrast ratio of skin color is strengthened by the homomorphic filter. Second, the skin color enhancement model is established using YCbCr color space components to locate the face area. Third, the feature based on differential horizontal integral projection is extracted from the face. Finally, the block PCA with deep neural network is used to accomplish the facial expression recognition. The experimental results indicate that in the case of weaker illumination and more complicated backgrounds, both the face detection and facial expression recognition can be achieved effectively by the proposed algorithm, meanwhile the mean recognition rate obtained by the facial expression recognition method is improved by 2.7% comparing with the traditional Local Binary Patterns (LBPs) method. <\/jats:p>","DOI":"10.1142\/s0218001420560108","type":"journal-article","created":{"date-parts":[[2020,2,17]],"date-time":"2020-02-17T10:41:36Z","timestamp":1581936096000},"page":"2056010","source":"Crossref","is-referenced-by-count":9,"title":["Human Emotion Recognition Based on Face and Facial Expression Detection Using Deep Belief Network Under Complicated Backgrounds"],"prefix":"10.1142","volume":"34","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-1360-8344","authenticated-orcid":false,"given":"Lei","family":"Huang","sequence":"first","affiliation":[{"name":"Automation Department, School of Mechanical and Electronic Engineering, Nanjing Forestry University, Nanjing 210037, P. 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