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 -> Hobject: HRegion |
| Region in which the features are to be examined. | |
|
Image (input_object) |
image -> Hobject: HImage ( byte ) |
| Gray value image. | |
|
Feature (input_control) |
string -> HTuple.char * |
| Feature to be examined. | |
| Default value: 'convexity' | |
| List of values: 'convexity', 'compactness', 'anisometry', 'holes' | |
|
Row (input_control) |
point.y -> HTuple.long |
| 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 -> HTuple.long |
| 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 -> HTuple.double * / long * |
| Absolute distribution of the feature. | |
|
RelativeHisto (output_control) |
histogram-array -> HTuple.double * |
| Relative distribution of the feature. | |
The operator ::shape_histo_point returns the value 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.
::histo_to_thresh, ::threshold, ::gen_region_histo
::connection, ::connect_and_holes, ::convexity, ::compactness, ::set_paint
Image filters
