Digitization
- Sampling
- Quantization
- Encoding
Sampling
- Nyquist theorem: The sampling frequency must be at least twice the highest frequency present for a signal to be reconstructed from a sampled version. Nyquist frequency: $f_s \ge 2\cdot f_{max}$
Quantization
Bit Rate
- Bit Rate (bits/second) = Sampling rate (Hz) x Quantization per sample (bits)
Image
- RGB image has 3 channels (red, green, blue)
- Bit depth（位深）：每个通道的位数
- 典型：8-bit、16-bit、32-bit float（都是 per channel）
- Bits per pixel（bpp，像素总位数 / 也常被叫“color depth”）：位深 × 通道数
- 例如：8-bit × 3 通道（BGR）＝ 24 bpp