Data Compression Of X-Ray Images By Adaptive Differential Pulse Code Modulation (DPCM) Coding

1981 ◽  
Author(s):  
Leonard A. Lehmann ◽  
Albert Macovski
Keyword(s):  
Data Compression ◽  
Differential Pulse ◽  
Pulse Code Modulation ◽  
X Ray ◽  
Differential Pulse Code Modulation ◽  
Code Modulation

scholarly journals Stream-Based Visually Lossless Data Compression Applying Variable Bit-Length ADPCM Encoding

Sensors ◽  
2021 ◽  
Vol 21 (13) ◽  
pp. 4602
Author(s):  
Shinichi Yamagiwa ◽  
Yuma Ichinomiya
Keyword(s):  
Data Compression ◽  
High Speed ◽  
Lossless Compression ◽  
Differential Pulse ◽  
Video Stream ◽  
Video Encoding ◽  
Pulse Code Modulation ◽  
Differential Pulse Code Modulation ◽  
Code Modulation ◽  
Lossless Data Compression

Video applications have become one of the major services in the engineering field, which are implemented by server–client systems connected via the Internet, broadcasting services for mobile devices such as smartphones and surveillance cameras for security. Recently, the majority of video encoding mechanisms to reduce the data rate are mainly lossy compression methods such as the MPEG format. However, when we consider special needs for high-speed communication such as display applications and object detection ones with high accuracy from the video stream, we need to address the encoding mechanism without any loss of pixel information, called visually lossless compression. This paper focuses on the Adaptive Differential Pulse Code Modulation (ADPCM) that encodes a data stream into a constant bit length per data element. However, the conventional ADPCM does not have any mechanism to control dynamically the encoding bit length. We propose a novel ADPCM that provides a mechanism with a variable bit-length control, called ADPCM-VBL, for the encoding/decoding mechanism. Furthermore, since we expect that the encoded data from ADPCM maintains low entropy, we expect to reduce the amount of data by applying a lossless data compression. Applying ADPCM-VBL and a lossless data compression, this paper proposes a video transfer system that controls throughput autonomously in the communication data path. Through evaluations focusing on the aspects of the encoding performance and the image quality, we confirm that the proposed mechanisms effectively work on the applications that needs visually lossless compression by encoding video stream in low latency.

Entropy-coded hybrid differential pulse-code modulation

1983 ◽  
Vol 19 (2) ◽  
pp. 63 ◽  
Author(s):  
N.M. Nasrabadi ◽  
S.K. Pal ◽  
R.A. King
Keyword(s):  
Differential Pulse ◽  
Pulse Code Modulation ◽  
Differential Pulse Code Modulation ◽  
Code Modulation
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