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1 April 1994 Practical experiment on noise perception in noisy images
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Two noise experiments have been done to determine the perception level of camera noise in dynamic sequences of medical low-dose X- ray images. The X-ray dose per image was at a fluoroscopic level of 1(mu) R/image. In the first experiment an adjustable amount of white noise was mixed with the video output signal of a standard medical X-ray image-intensifier/video-camera imaging chain. The paper explains the difficulties with this experiment and how the second experiment was organized to find more reliable results on noise perception. The second experiment was based on software simulations of both quantum noise and camera noise. The perception threshold was determined with a so-called two- alternative forced-choice method while presenting the noisy image sequences dynamically on a split-screen display. The perception threshold of the camera noise in the image was at a level as low as 27dB below the signal level.
© (1994) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Hans A. Luijendijk "Practical experiment on noise perception in noisy images", Proc. SPIE 2166, Medical Imaging 1994: Image Perception, (1 April 1994);

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