Real-Time X-Ray Image Processing; Techniques for Sensitivity Improvement Using Low-Cost Equipment

Improvements on Low Cost CT Systems

“…Data acquisition is handled by a framegrabher board (Data Translationmodel DT2867). This board contains a 16-bit buffer into which we are able to accumulate successive image frames to produce an effective 12-bit dynamic range [3,4,5). Projections are taken at 1 o increments and a fittered back projection er=::::: algorithm is used for reconstruction.…”

Automation of real-time X-ray scans

“…The conclusions section of this chapter gives a broad picture of what has been done in this research, and the future work section will describe several ideas as to how this program can be extended for an efficient usage of its features. it is accumulated over 200 frames has been moved laterally upwards by one-tenth of an inch a nd then subtracted from the incom ing measurements [15]. T he resu ltant image is shown in figure 5.3.…”

“…Then, a calibration field is established, which is used to decrement the accumulation buffer (performed by the SUBTRACT button of the window) by the same number of frames and the resultant image can be viewed using hardware divide and offset circuitry. Experiments have proven that this type of calibration with 16-bit precision can dramatically increase the sensitivity limitations of the real-time X-ray inspection systems [15].…”

“…Much of this part has been derived from the existing XR Vision program for image processing [14], [15]. The Image Acquisition part of the program features two individual buttons titled Average and Accumulate (see Figure 3.3).…”

“…XR Vision [14], [15] is an image processing hardware/software system which can be hosted by any PC running Windows 3.11. XR Vision is capable of real time image acquisition and processing.…”