Determine a histogram of features along all threshold values.
Like shape_histo_all the operator shape_histo_point carries out 255 threshold value operations within Region with the gray values of Image. Contrary to shape_histo_all only the segmented region containing the pixel (Row, Column) is taken into account here. The entry i in the histogram then corresponds to the number of holes of this region segmented with the threshold i (Feature = 'holes') or the feature value of the region (Feature = 'convexity', 'compactness', 'ansisometry'), respectively.
The histogram can also be displayed directly as a graphic via the operators set_paint(::WindowHandle,'component_histogram':) and disp_image.
|
Region (input_object) |
region -> object |
| Region in which the features are to be examined. | |
|
Image (input_object) |
image -> object : byte |
| Gray value image. | |
|
Feature (input_control) |
string -> string |
| Feature to be examined. | |
| Default value: 'convexity' | |
| List of values: 'convexity', 'compactness', 'anisometry', 'holes' | |
|
Row (input_control) |
point.y -> integer |
| Row of the pixel which the region must contain. | |
| Default value: 256 | |
| Suggested values: 10, 50, 100, 200, 300, 400 | |
|
Column (input_control) |
point.x -> integer |
| Column of the pixel which the region must contain. | |
| Default value: 256 | |
| Suggested values: 10, 50, 100, 200, 300, 400 | |
|
AbsoluteHisto (output_control) |
histogram-array -> real / integer |
| Absolute distribution of the feature. | |
|
RelativeHisto (output_control) |
histogram-array -> real |
| Relative distribution of the feature. | |
The operator shape_histo_point returns the value 2 (H_MSG_TRUE) if an image with defined gray values is entered. The behavior in case of empty input (no input images available) is set via the operator set_system(::'no_object_result',<Result>:), the behavior in case of empty region is set via set_system(::'empty_region_result',<Result>:). If necessary an exception handling is raised.
shape_histo_point is reentrant and processed without parallelization.
histo_to_thresh, threshold, gen_region_histo
connection, connect_and_holes, convexity, compactness, set_paint
Image filters
