| Operators |
gen_image1_extern — Create an image from a pointer on the pixels with storage management.
The operator gen_image1_extern creates an image of the size Width * Height. The pixels in PixelPointer are stored line-sequentially. The type of the given pixels (PixelPointer) must correspond to Type (see gen_image_const for a more detailed description of the image types). Note that how to pass a pointer value depends on the used operator signature and programming environment. Make sure to pass the actual memory address where the image data is stored, not the address of a pointer variable. Care must be taken not to truncate 64-bit pointers on 64-bit architectures.
The memory for the new image is not newly allocated by HALCON, contrary to gen_image1, and thus is not copied either. This means that the memory space that PixelPointer points to must be released by deleting the object Image. This is done by the procedure ClearProc provided by the caller. This procedure must have the following signature
void ClearProc(void* ptr);
and will be called using __cdecl calling convention when deleting Image. If the memory shall not be released (in the case of frame grabbers or static memory) a procedure “without trunk” or the NULL-Pointer can be passed. Analogous to the parameter PixelPointer the pointer has to be passed to the procedure depending on the used operator signature and programming environment.
gen_image1_extern does not check if enough memory for an image of Width * Height is allocated in PixelPointer.
Created HALCON image.
Pixel type.
Default value: 'byte'
List of values: 'byte', 'cyclic', 'direction', 'int1', 'int2', 'int4', 'real', 'uint2'
Width of image.
Default value: 512
Suggested values: 128, 256, 512, 1024
Typical range of values: 1 ≤ Width ≤ 512 (lin)
Minimum increment: 1
Recommended increment: 10
Restriction: Width >= 1
Height of image.
Default value: 512
Suggested values: 128, 256, 512, 1024
Typical range of values: 1 ≤ Height ≤ 512 (lin)
Minimum increment: 1
Recommended increment: 10
Restriction: Height >= 1
Pointer to the first gray value.
Pointer to the procedure re-releasing the memory of the image when deleting the object.
Default value: 0
void NewImage(Hobject *new)
{
unsigned char *image;
int r,c;
image = malloc(640*480);
for (r=0; r<480; r++)
for (c=0; c<640; c++)
image[r*640+c] = c % 255;
gen_image1_extern(new,"byte",640,480,(Hlong)image,(Hlong)free);
}
The operator gen_image1_extern returns the value 2 (H_MSG_TRUE) if the parameter values are correct. Otherwise an exception is raised.
gen_image1, gen_image_const, get_image_pointer1, gen_image3_extern
reduce_domain, paint_gray, paint_region, set_grayval
Foundation
| Operators |