Abstract: An X-ray scanning apparatus for locating a contaminant in a product, the apparatus comprising: means for generating an X-ray image of the product; means for assigning a grey scale value to a plurality of pixels; means for identifying a plurality of suspect pixels; means, which for each suspect pixel: selects two neighboring pixels in a first direction lying on opposed sides of the suspect pixel and determines which of the first direction pixels has the lowest grey value; selects two neighboring pixels in a second direction lying on opposed sides of the suspect pixel and determines which of the second direction pixels has the lowest grey value; determines a first direction difference value by taking the grey value difference between the lowest grey value first direction pixel and the grey value of the suspect; determines a second direction difference value by taking the grey value difference between the lowest grey value second direction pixel and the grey value of the suspect; determines a first direction sco

Abstract: An X-ray scanning apparatus for locating a contaminant in a product, the apparatus comprising: means for generating an X-ray image of the product; means for assigning a grey scale value to a plurality of pixels; means for identifying a plurality of suspect pixels; means, which for each suspect pixel: selects two neighbouring pixels in a first direction lying on opposed sides of the suspect pixel and determines which of the first direction pixels has the lowest grey value; selects two neighbouring pixels in a second direction lying on opposed sides of the suspect pixel and determines which of the second direction pixels has the lowest grey value; determines a first direction difference value by taking the grey value difference between the lowest grey value first direction pixel and the grey value of the suspect; determines a second direction difference value by taking the grey value difference between the lowest grey value second direction pixel and the grey value of the suspect; determines a first direction s

Abstract: An intelligent printer-plotter for use with a source of time-correlated digital systolic and diastolic blood pressure data and heart rate data receives, stores, analyzes, and edits the data, producing tables of data and graphs having a particular format. The charter smooths the data by a moving average technique and includes modes which permit the operator to edit the data manually or to command the charter to perform the editing automatically. In the automatic editing mode, the data are tested against pre-established criteria. Data not meeting the criteria is flagged so that it can be passed over in subsequent calculation and printing operations; however, the flagged data is not destroyed, but is retained in a memory to permit subsequent re-examination and to permit verification of the editing process.