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Image Recording Devices: Film Characteristics & Advancements

Learn about the characteristics of film used in image recording devices, including the process of film processing and advancements in technology like multiformat cameras, laser cameras, and more. Explore the advantages and disadvantages of laser cameras, grayscale mapping, transparency film with dry processing, video printers, and magnetic tape recording.

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Image Recording Devices: Film Characteristics & Advancements

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  1. CHAPTER 19 Image-Recording Devices

  2. FILM CHARACTERISTICS • Film is constructed by coating a polyester base with an emulsion layer, the active component. The emulsion consists of a large number of small silver halide grains suspended in a gelatin matrix. • Absorption of light photons causes electrons to be released and moved through the silver halide crystal.

  3. Cont. • The amount of darkening is quantified by the optical density. • The relationship between optical density and percentage of light transmitted is shown in below table.

  4. Cont. • Film is characterized by a plot of optical density versus exposure.

  5. Film Processing • An automatic processor performs the chemical operations necessary to transform the latent image into a visual pattern of shades of gray. • For 90-second processing, the time for each step is partitioned as follows:

  6. MULTIFORMAT CAMERA • One or more images are recorded on a single sheet of transparency film.

  7. LASER CAMERA • A laser replaces the CRT as the light source in the laser camera. • The intensity and size of the laser beam are precisely controlled.

  8. Quality Control • Several test patterns are available for imaging to evaluate uniformity, pixel registration, and gray-scale reproducibility.

  9. Advantages and Disadvantages • The laser camera provides a fast and highly reliable method of recording hard copy images on film. It can accommodate different size, and the image format can br varied. • The expense of a laser camera dedicated to ultrasound.

  10. GRAY-SCALE MAPPING • Gray-scale maps assume different functional shapes to highlight certain informational content in the image.

  11. Transparency Film With Dry Processing • In the past few years high-quality hard copy image recording without wet chemistry has been introduced.

  12. Video Printer • The video printer provides a black and white hard copy recording of an image displayed on the monitor.

  13. COLOR VIDEO PRINTER • A color image on paper is viewed by sensing the reflected light from colored dyes distributed across the papersurface.

  14. MAGNETIC TAPE RECORDING • Recording a series of images for subsequent playback in real time is often accomplished with magnetic tape recording.

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