VdoCipherSubsampling
Chroma subsampling reduces the amount of color information, it enables efficient storage and transmission of high-quality video while minimizing the impact on perceived image quality.
Chroma subsampling is a technique used in video compression to reduce the amount of data required to represent a color image or video signal. It exploits the fact that the human eye is more sensitive to variations in brightness (luminance) than to variations in color (chrominance).
How Chroma Subsampling Works
Instead of storing full color information for every pixel, chroma subsampling reduces the spatial resolution of the color information while maintaining the full resolution of the luminance information. This is often expressed in a ratio format:
- 4:4:4: No chroma subsampling. Full color information is stored for every pixel.
- 4:2:2: Reduces the horizontal chrominance resolution by half.
- 4:2:0: Reduces both the horizontal and vertical chrominance resolution by half.
Benefits of Chroma Subsampling
- Reduced File Size: Significantly reduces the file size of video files, leading to lower storage requirements and faster transmission.
- Improved Compression Efficiency: Allows for higher compression ratios without significant loss of perceived image quality.
Applications of Chroma Subsampling
- Video Streaming: Widely used in online video platforms like YouTube and Netflix to reduce bandwidth requirements.
- Video Conferencing: Enables smooth video calls with limited bandwidth.
- Digital Video Broadcasting: Helps to efficiently transmit high-definition video signals.