24 research outputs found
Detecting Oriented Text in Natural Images by Linking Segments
Most state-of-the-art text detection methods are specific to horizontal Latin
text and are not fast enough for real-time applications. We introduce Segment
Linking (SegLink), an oriented text detection method. The main idea is to
decompose text into two locally detectable elements, namely segments and links.
A segment is an oriented box covering a part of a word or text line; A link
connects two adjacent segments, indicating that they belong to the same word or
text line. Both elements are detected densely at multiple scales by an
end-to-end trained, fully-convolutional neural network. Final detections are
produced by combining segments connected by links. Compared with previous
methods, SegLink improves along the dimensions of accuracy, speed, and ease of
training. It achieves an f-measure of 75.0% on the standard ICDAR 2015
Incidental (Challenge 4) benchmark, outperforming the previous best by a large
margin. It runs at over 20 FPS on 512x512 images. Moreover, without
modification, SegLink is able to detect long lines of non-Latin text, such as
Chinese.Comment: To Appear in CVPR 201
Rosetta: Large scale system for text detection and recognition in images
In this paper we present a deployed, scalable optical character recognition
(OCR) system, which we call Rosetta, designed to process images uploaded daily
at Facebook scale. Sharing of image content has become one of the primary ways
to communicate information among internet users within social networks such as
Facebook and Instagram, and the understanding of such media, including its
textual information, is of paramount importance to facilitate search and
recommendation applications. We present modeling techniques for efficient
detection and recognition of text in images and describe Rosetta's system
architecture. We perform extensive evaluation of presented technologies,
explain useful practical approaches to build an OCR system at scale, and
provide insightful intuitions as to why and how certain components work based
on the lessons learnt during the development and deployment of the system.Comment: Proceedings of the 24th ACM SIGKDD International Conference on
Knowledge Discovery & Data Mining (KDD) 2018, London, United Kingdo
Silencing of D-Lactate Dehydrogenase Impedes Glyoxalase System and Leads to Methylglyoxal Accumulation and Growth Inhibition in Rice
D-Lactate is oxidized by two classes of D-lactate dehydrogenase (D-LDH), namely, NAD-dependent and NAD-independent D-LDHs. Little is known about the characteristics and biological functions of D-LDHs in rice. In this study, a functional NAD-independent D-LDH (LOC_Os07g06890) was identified in rice, as a result of alternative splicing events. Characterization of the expression profile, subcellular localization, and enzymatic properties of the functional OsD-LDH revealed that it is a mitochondrial cytochrome-c-dependent D-LDH with high affinity and catalytic efficiency. Functional analysis of OsD-LDH RNAi transgenic rice demonstrated that OsD-LDH participates in methylglyoxal metabolism by affecting the activity of the glyoxalase system and aldo-keto reductases. Under methylglyoxal treatment, silencing of OsD-LDH in rice resulted in the accumulation of methylglyoxal and D-lactate, the decrease of reduced glutathione in leaves, and ultimately severe growth inhibition. Moreover, the detached leaves of OsD-LDH RNAi plants were more sensitive to salt stress. However, the silencing of OsD-LDH did not affect the growth under photorespiration conditions. Our results provide new insights into the role of NAD-independent D-LDHs in rice