Number of Threshold Levels

The threshold interval specified by [T Lower threshold] and [U Upper threshold] is broken into the number of steps specified by this field. Particles with an intensity above the midpoint of this field are treated as "normal" intensity, while those below are considered "faint". Note that the tracking process will not use threshold steps smaller than four intensity units, even if such steps are implied by the value for this field.

Number of threshold levels ?

This entry specifies the number of different thresholds particles will be searched for in the specified range. The smaller the number of thresholds the faster the particles will be located. The larger the number of thresholds, the better DigImage will be able to discriminate between two particles very close together. The minimum number of thresholds is two. The maximum number is determined by the the tracking process which will not use threshold steps smaller than four intensity units, even if such steps are implied by the value for this field.

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Stuart Dalziel, last page update: 19 February 1996