论文信息 - Equivalent blur as a function of spurious response of a sampled imaging system: application to character recognition.

Equivalent blur as a function of spurious response of a sampled imaging system: application to character recognition.

Image sampling effects have been variously quantified as aliased signal, spatial signal, and spatial noise. However, a relationship between these characteristics and human object recognition has not been established in a coherent, mathematical form. We present a heuristic study that characterizes the performance degradation that is due to the spurious response of a sampled imaging system as an effective increase in system blur. A character recognition experiment was performed in which 20 observers responded to 3500 character pairs of blur and sample spacing. A baseline was created where the probability of character recognition was determined as a function of blur without sampling. The sampled characters were then compared with this baseline so that the effect of sampling on character recognition could be determined. Finally, an increase in blur was established as a function of spurious response, which describes the overall effect of sampling on observer character recognition.

R G Driggers | R Vollmerhausen | B O'Kane

[1] J. C. Fontanella,et al. The Definition of the OTF and the Measurement of Aliasing for Sampled Imaging Systems , 1982 .

[2] F. O. Huck,et al. Information Density And Efficiency Of Two-Dimensional (2-D) Sampled Imagery , 1981, Optics & Photonics.

[3] J. D'Agostino. An experimental study of the effects of sampling on FLIR performance , 1992, Infrared Information Symposia.

[4] James D. Howe,et al. Study of the effects of focal plane array design parameters on ATR performance , 1993, Defense, Security, and Sensing.

[5] Richard H. Vollmerhausen. Impact of display modulation transfer function on the quality of sampled imagery , 1996, Defense, Security, and Sensing.

[6] Stephen K. Park,et al. Aliasing as noise: a quantitative and qualitative assessment , 1993, Defense, Security, and Sensing.

[7] Thomas H. Cook,et al. Spatial aliasing effects in ground vehicle IR imagery , 1992, Defense, Security, and Sensing.

[8] Richard H. Vollmerhausen. Display of sampled imagery , 1992, Infrared Information Symposia.

[9] R A Schowengerdt,et al. Image sampling, reconstruction, and the effect of sample-scene phasing. , 1982, Applied optics.

[10] James A. Dawson,et al. Resolving the differences in oversampled and undersampled imaging sensors: updated target acquisition modeling strategies for staring and scanning FLIR systems , 1992, Defense, Security, and Sensing.