English
Data compression tutorial: Part 3
By Steven W. Smith, Ph.D.
JPEG
Many methods of lossy compression have been developed; however, a family of techniques called transform compression has proven the most valuable. The best example of transform compression is embodied in the popular JPEG standard of image encoding. JPEG is named after its origin, the Joint Photographers Experts Group. We will describe the operation of JPEG to illustrate how lossy compression works.
We have already discussed a simple method of lossy data compression, coarser sampling and/or quantization (CS&Q in Table 27-1). This involves reducing the number of bits per sample or entirely discard some of the samples. Both these procedures have the desired effect: the data file becomes smaller at the expense of signal quality. As you might expect, these simple methods do not work very well.
JPEG
Many methods of lossy compression have been developed; however, a family of techniques called transform compression has proven the most valuable. The best example of transform compression is embodied in the popular JPEG standard of image encoding. JPEG is named after its origin, the Joint Photographers Experts Group. We will describe the operation of JPEG to illustrate how lossy compression works.
We have already discussed a simple method of lossy data compression, coarser sampling and/or quantization (CS&Q in Table 27-1). This involves reducing the number of bits per sample or entirely discard some of the samples. Both these procedures have the desired effect: the data file becomes smaller at the expense of signal quality. As you might expect, these simple methods do not work very well.
|
E-mail This Article | 
|
|
Printer-Friendly Page |
Related Articles
- Optimizing embedded software for power efficiency: Part 3 - Optimizing data flow and memory
- From a Lossless (~1.5:1) Compression Algorithm for Llama2 7B Weights to Variable Precision, Variable Range, Compressed Numeric Data Types for CNNs and LLMs
- Specifying a PLL Part 3: Jitter Budgeting for Synthesis
- Next Gen Scan Compression Technique to overcome Test challenges at Lower Technology Nodes (Part - I)
- Low-loss compression of CPRI baseband data
New Articles
- Accelerating RISC-V development with Tessent UltraSight-V
- Automotive Ethernet Security Using MACsec
- What is JESD204C? A quick glance at the standard
- Optimizing Power Efficiency in SOC with PVT Sensor-Assisted DVFS Technology
- Bandgap Reference (BGR) Circuit Design and Transient Analysis in 90nm VLSI Technology
Most Popular
- System Verilog Assertions Simplified
- Accelerating RISC-V development with Tessent UltraSight-V
- System Verilog Macro: A Powerful Feature for Design Verification Projects
- Understanding Logic Equivalence Check (LEC) Flow and Its Challenges and Proposed Solution
- Design Rule Checks (DRC) - A Practical View for 28nm Technology