``Cue-based_Hyst_Threshold''--Hysteresis Thresholding using a biopsy image

VFX name:

iHystThreshSeed

IMPROMPTU Equivalent:

Seeded_Hysteresis_Threshold

purpose:

Similar to Hysteresis_Threshold with the exception that threshold parameters are based on a given biopsy rather than being set manually by user.

Mean $\mu$ and Standard Deviation $\sigma$ are computed from a given biopsy of the input image. The parameters a and b are assigned by the user. This function will find all objects satisfying the threshold criteria shown below:

1.

The object must contain all voxels which satisfy the following relationship.
$\mu - a\sigma < v(x,y,z) < \mu + a\sigma$

2.

All within the object must be connected to above selected voxels and should satisfy the following relationship.
$\mu -(a+b)\sigma < v(x,y,z) < \mu +(a+b)\sigma$.

Note that $T_1 \geq T_2$ and $T_1, T_2 \geq 2$ for this function.

input:

An 8-bit grayscale volume.
A single biopsy image (obtained using Interseg).

output:

An 8-bit binary-valued volume.

parameters:

Default parameters menu is

cue_filename = foobar
a_value = 1.0
b_value = 1.0

comments:

Comments below:

1.

This function is comparable in run time to the 2-D conn-comp and 3-D conn-comp operations.

2.

A variation of Hysteresis_Threshold function.