Contrast-to-noise ratio
Measure of determine image quality
Contrast-to-noise ratio (CNR)[1] is a measure used to determine image quality. CNR is similar to the metric signal-to-noise ratio (SNR), but subtracts a term before taking the ratio. This is important when there is a significant bias in an image, such as from haze.[2] As can be seen in the picture at right, the intensity is rather high even though the features of the image are washed out by the haze. Thus this image may have a high SNR metric, but will have a low CNR metric.
One way to define contrast-to-noise ratio is:[3][4]
where SA and SB are signal intensities for signal producing structures A and B in the region of interest and σo is the standard deviation of the pure image noise.
See also
- Contrast resolution
References
- ^ Welvaert, Marijke; Rosseel, Yves; Yacoub, Essa (6 November 2013). "On the Definition of Signal-To-Noise Ratio and Contrast-To-Noise Ratio for fMRI Data". PLOS ONE. 8 (11): e77089. Bibcode:2013PLoSO...877089W. doi:10.1371/journal.pone.0077089. PMC 3819355. PMID 24223118.
- ^ Jiang, Hou; Lu, Ning; Yao, Ling (14 October 2016). "A High-Fidelity Haze Removal Method Based on HOT for Visible Remote Sensing Images". Remote Sensing. 8 (10): 844. Bibcode:2016RemS....8..844J. doi:10.3390/rs8100844.
- ^ Desai, Nikunj. "Practical Evaluation of Image Quality in Computed Radiographic (CR) Imaging Systems" (PDF).
- ^ Timischl, F. (January 2015). "The contrast-to-noise ratio for image quality evaluation in scanning electron microscopy". Scanning. 37 (1): 54–62. doi:10.1002/sca.21179. PMID 25533747.
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Noise (physics and telecommunications)
- Acoustic quieting
- Distortion
- Noise cancellation
- Noise control
- Noise measurement
- Noise power
- Noise reduction
- Noise temperature
- Phase distortion
- Audio
- Buildings
- Electronics
- Environment
- Government regulation
- Human health
- Images
- Radio
- Rooms
- Ships
- Sound masking
- Transportation
- Video
- Additive white Gaussian noise (AWGN)
- Atmospheric noise
- Background noise
- Brownian noise
- Burst noise
- Cosmic noise
- Flicker noise
- Gaussian noise
- Grey noise
- Infrasound
- Jitter
- Johnson–Nyquist noise (thermal noise)
- Pink noise
- Quantization error (or q. noise)
- Shot noise
- White noise
- Coherent noise
terms
- Channel noise level
- Circuit noise level
- Effective input noise temperature
- Equivalent noise resistance
- Equivalent pulse code modulation noise
- Impulse noise (audio)
- Noise figure
- Noise floor
- Noise shaping
- Noise spectral density
- Noise, vibration, and harshness (NVH)
- Phase noise
- Pseudorandom noise
- Statistical noise
- Carrier-to-noise ratio (C/N)
- Carrier-to-receiver noise density (C/kT)
- dBrnC
- Eb/N0 (energy per bit to noise density)
- Es/N0 (energy per symbol to noise density)
- Modulation error ratio (MER)
- Signal, noise and distortion (SINAD)
- Signal-to-interference ratio (S/I)
- Signal-to-noise ratio (S/N, SNR)
- Signal-to-noise ratio (imaging)
- Signal-to-interference-plus-noise ratio (SINR)
- Signal-to-quantization-noise ratio (SQNR)
- Contrast-to-noise ratio (CNR)
- List of noise topics
- Acoustics
- Colors of noise
- Interference (communication)
- Noise generator
- Spectrum analyzer
- Thermal radiation
methods
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