Radiometric calibration using temporal irradiance mixtures

1. CVPR 2008 Advisor : prof. Huei-Yung Lin Reporter: Annie Lin Date : 2009/11/3 Radiometric calibration using temporal irradiance mixtures

2. Outline • Introduction • New method for sampling camera response function • Temporallymixing two uncalibrated irradiances within a single camera exposure. • General idea of temporal irradiance mixing • Display-based calibration method • Calibration from motion blur • Lin et al.[6] Radiometric calibration from a single image • Experiments and result

3. Introduction • Temporally mixing two uncalibrated irradiances within a single camera exposure. • The scene brightness at any given pixel may vary due to motion blur or illumination changes. • 1. Compute the response curve using temporal mixtures of two pixel intensities on an uncalibrated computer display • 2. Using temporal irradiance mixtures caused by motion blur. • Lin et al. [6] do not test the idea of defocus and motion blur as sources of linear irradiance blends. • Requirement : one input image only!!

4. Radiometric Calibration from a single image [6]

5. Calibration using temporal irradiance mixtures • Mitsunaga and Nayar[11]

6. Scale and offset ambiguities • Combining multiple irradiance blends

7. Experiments and result :

9. Thank you = )