Illuminate image.
The operator ::illuminate enhances contrast. Very dark parts of the image are "illuminated" more strongly, very light ones are "darkened". If orig is the original gray value and mean is the corresponding gray value of the low pass filtered image detected via the operators ::mean_image and filter size MaskHeight x MaskWidth, the resulting gray value is new:
new = round ( (127 - low) * Factor + orig ).
Height Width Factor
---------------------
40 40 0.55
100 100 0.7
150 150 0.8
|
Image (input_object) |
(multichannel-)image(-array) -> Hobject: HImage(Array) ( byte ) |
| Image to be enhanced. | |
|
ImageIlluminate (output_object) |
(multichannel-)image(-array) -> Hobject * : HImage(Array) ( byte ) |
| "Illuminated" image. | |
|
MaskWidth (input_control) |
extent.x -> HTuple.long |
| Width of low pass mask. | |
| Default value: 101 | |
| Suggested values: 31, 41, 51, 71, 101, 121, 151, 201 | |
| Typical range of values: 3 <= MaskWidth <= 299 | |
| Minimum increment: 2 | |
|
Recommended increment: 10 | |
|
MaskHeight (input_control) |
extent.y -> HTuple.long |
| Height of low pass mask. | |
| Default value: 101 | |
| Suggested values: 31, 41, 51, 71, 101, 121, 151, 201 | |
| Typical range of values: 3 <= MaskHeight <= 299 | |
| Minimum increment: 2 | |
|
Recommended increment: 10 | |
|
Factor (input_control) |
real -> HTuple.double |
| Scales the "correction gray value" added to the original gray values. | |
| Default value: 0.7 | |
| Suggested values: 0.3, 0.5, 0.7, 1.0, 1.5, 2.0, 3.0, 5.0 | |
| Typical range of values: 0.0 <= Factor <= 5.0 | |
| Minimum increment: 0.01 | |
|
Recommended increment: 0.2 | |
| Restriction: (0 < Factor) && (Factor < 5) | |
read_image(&Image,"fabrik"); disp_image(Image,WindowHandle); illuminate(Image,&Better,40,40,0.55); disp_image(Better,WindowHandle);
If the parameter values are correct the operator ::illuminate returns the value H_MSG_TRUE The behavior in case of empty input (no input images available) is set via the operator ::set_system('no_object_result',<Result>). If necessary an exception handling is raised.
::scale_image_max, ::equ_histo_image, ::mean_image, ::sub_image
Image filters
