ImageGetPixelGrayΒΆ
ImageGetPixelGray returns the gray value of a pixel.
-
gray = ImageGetPixelGray(hImg, x, y) -
grayMat = ImageGetPixelGray(hImg)
Return Value
gray is the gray value of the specified pixel in the range 0 to 255. If x or y is out of range the function returns the gray value of the pixel x=1, y=1. In case of an error the functions returns -1.
Parameters
-
hImg hImg identifies the picture created with ImageCreate.
-
x x is the horizontal pixel position in the range 1 to ImageGetWidth.
-
y y is the vertical pixel position in the range 1 to ImageGetHeight.
Example
The following saves the gray value in a text file. The data file can be loaded with File=>More File Functions=>Load 3D Data Matrix. If the image size is big the image size should be reduced to approx. 500 * 500.
def image_save_pixel(hImg, ssFile)
{
fp = fopen(ssFile, "wt");
if (!fp) {
return FALSE;
}
dx = ImageGetWidth(hImg);
dy = ImageGetHeight(hImg);
for (j in 1:dy) {
for (i in 1:dx) {
g = ImageGetPixelGray(hImg, i, j)
fprintf(fp, "%d\t", g);
}
fprintf(fp, "\n");
}
fclose(fp);
return TRUE;
}
History
| Version | Description |
|---|---|
| 5.3.2 | |
| 5.2.0 | New |
id-552611