FRAME-CONSTRAINED TOTAL VARIATION REGULARIZATION FOR WHITE NOISE REGRESSION

• 成果类型: Article
• 署名作者: del Alamo, Miguel; Li, Housen; Munk, Axel
• 署名单位: University of Gottingen
• 刊物名称: ANNALS OF STATISTICS
• ISSN/ISSBN: 0090-5364
• DOI: 10.1214/20-AOS2001
• 发表日期: 2021
• 页码: 1318-1346
• 关键词: total variation minimization; Nonparametric Regression; asymptotic equivalence; variance-estimation; Adaptive estimation; DECOMPOSITION; restoration; CHOICE

摘要

Despite the popularity and practical success of total variation (TV) regularization for function estimation, surprisingly little is known about its theoretical performance in a statistical setting. While TV regularization has been known for quite some time to be minimax optimal for denoising one-dimensional signals, for higher dimensions this remains elusive until today. In this paper, we consider frame-constrained TV estimators including many well-known (overcomplete) frames in a white noise regression model, and prove their minimax optimality w.r.t. L-q-risk (1 <= q < infinity) up to a logarithmic factor in any dimension d >= 1. Overcomplete frames are an established tool in mathematical imaging and signal recovery, and their combination with TV regularization has been shown to give excellent results in practice, which our theory now confirms. Our results rely on a novel connection between frame-constraints and certain Besov norms, and on an interpolation inequality to relate them to the risk functional. Additionally, our results explain a phase transition in the minimax risk for BV functions.