Class: OpenCV::CvScalar
- Inherits:
-
Object
- Object
- OpenCV::CvScalar
- Defined in:
- ext/opencv/cvscalar.cpp,
ext/opencv/cvscalar.cpp
Overview
Element-value of one pixel. OpenCV supports the image of 4-channels in the maximum. Therefore, CvScalar has 4-values.
C structure is here, very simple.
typdef struct CvScalar {
double val[4];
} CvScalar;
If obtain CvScalar-object from the method of CvMat(or IplImage), the channel outside the range is obtained as all 0.
image = IplImage::load("opencv.jpg") #=> 3-channel 8bit-depth BGR image
pixel = image[10, 20] #=> Get pixel value of (10, 20) of image. pixel is CvScalar-object.
blue, green, red = pixel[0], pixel[1], pixel[2]
# pixel[3] always 0.
CvColor is alias of CvScalar.
Constant Summary collapse
- Black =
cCvScalar::new_object(cvScalar(0x0,0x0,0x0))
- Silver =
cCvScalar::new_object(cvScalar(0x0c,0x0c,0x0c))
- Gray =
cCvScalar::new_object(cvScalar(0x80,0x80,0x80))
- White =
cCvScalar::new_object(cvScalar(0xff,0xff,0xff))
- Maroon =
cCvScalar::new_object(cvScalar(0x0,0x0,0x80))
- Red =
cCvScalar::new_object(cvScalar(0x0,0x0,0xff))
- Purple =
cCvScalar::new_object(cvScalar(0x80,0x0,0x80))
- Fuchsia =
cCvScalar::new_object(cvScalar(0xff,0x0,0xff))
- Green =
cCvScalar::new_object(cvScalar(0x0,0x80,0x0))
- Lime =
cCvScalar::new_object(cvScalar(0x0,0xff,0x0))
- Olive =
cCvScalar::new_object(cvScalar(0x0,0x80,0x80))
- Yellow =
cCvScalar::new_object(cvScalar(0x0,0xff,0xff))
cCvScalar::new_object(cvScalar(0x80,0x0,0x0))
- Blue =
cCvScalar::new_object(cvScalar(0xff,0x0,0x0))
- Teal =
cCvScalar::new_object(cvScalar(0x80,0x80,0x0))
- Aqua =
cCvScalar::new_object(cvScalar(0xff,0xff,0x0))
Instance Method Summary collapse
-
#[](index) ⇒ Object
Return value of index dimension.
-
#[]=(index, value) ⇒ Object
Set value of index dimension to value.
-
#new([d1][,d2][,d3][,d4]) ⇒ Object
constructor
Create new Scalar.
-
#sub(val[,mask]) ⇒ Object
(also: #-)
Return new CvScalar if val is CvScalar or compatible object.
-
#to_ary ⇒ Array
(also: #to_a)
Return values by Array.
-
#to_s ⇒ "<OpeCV::CvScalar:#selff[0]}
Return values by String.
Constructor Details
#new([d1][,d2][,d3][,d4]) ⇒ Object
Create new Scalar. Argument should be Fixnum (or nil as 0).
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# File 'ext/opencv/cvscalar.cpp', line 58
VALUE
rb_initialize(int argc, VALUE *argv, VALUE self)
{
VALUE val[4];
rb_scan_args(argc, argv, "04", &val[0], &val[1], &val[2], &val[3]);
CvScalar* self_ptr = CVSCALAR(self);
for (int i = 0; i < 4; ++i) {
self_ptr->val[i] = NIL_P(val[i]) ? 0 : NUM2DBL(val[i]);
}
return self;
}
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Instance Method Details
#[](index) ⇒ Object
Return value of index dimension.
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# File 'ext/opencv/cvscalar.cpp', line 76
VALUE
rb_aref(VALUE self, VALUE index)
{
int idx = NUM2INT(index);
if (idx < 0 || idx >= 4) {
rb_raise(rb_eIndexError, "scalar index should be 0...4");
}
return rb_float_new(CVSCALAR(self)->val[idx]);
}
|
#[]=(index, value) ⇒ Object
Set value of index dimension to value
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# File 'ext/opencv/cvscalar.cpp', line 92
VALUE
rb_aset(VALUE self, VALUE index, VALUE value)
{
int idx = NUM2INT(index);
if (idx < 0 || idx >= 4) {
rb_raise(rb_eIndexError, "scalar index should be 0...4");
}
CVSCALAR(self)->val[idx] = NUM2DBL(value);
return self;
}
|
#sub(val[,mask]) ⇒ Object Also known as: -
Return new CvScalar if val is CvScalar or compatible object.
self[I] - val[I]
Or return new CvMat if val is CvMat or subclass.
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# File 'ext/opencv/cvscalar.cpp', line 111
VALUE
rb_sub(int argc, VALUE *argv, VALUE self)
{
VALUE val, mask;
rb_scan_args(argc, argv, "11", &val, &mask);
if (rb_obj_is_kind_of(val, cCvMat::rb_class())) {
CvArr *val_ptr = CVARR(val);
VALUE dest = Qnil;
try {
dest = cCvMat::new_object(cvGetSize(val_ptr), cvGetElemType(val_ptr));
cvSubRS(val_ptr, *CVSCALAR(self), CVARR(dest), MASK(mask));
}
catch (cv::Exception& e) {
raise_cverror(e);
}
return dest;
}
else {
CvScalar *src = CVSCALAR(self);
CvScalar scl = VALUE_TO_CVSCALAR(val);
return new_object(cvScalar(src->val[0] - scl.val[0],
src->val[1] - scl.val[1],
src->val[2] - scl.val[2],
src->val[3] - scl.val[3]));
}
}
|
#to_ary ⇒ Array Also known as: to_a
Return values by Array.
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# File 'ext/opencv/cvscalar.cpp', line 164
VALUE
rb_to_ary(VALUE self)
{
return rb_ary_new3(4,
rb_aref(self, INT2FIX(0)),
rb_aref(self, INT2FIX(1)),
rb_aref(self, INT2FIX(2)),
rb_aref(self, INT2FIX(3)));
}
|
#to_s ⇒ "<OpeCV::CvScalar:#selff[0]}
Return values by String.
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# File 'ext/opencv/cvscalar.cpp', line 144
VALUE
rb_to_s(VALUE self)
{
const int i = 6;
VALUE str[i];
str[0] = rb_str_new2("<%s:%g,%g,%g,%g>");
str[1] = rb_str_new2(rb_class2name(CLASS_OF(self)));
str[2] = rb_aref(self, INT2FIX(0));
str[3] = rb_aref(self, INT2FIX(1));
str[4] = rb_aref(self, INT2FIX(2));
str[5] = rb_aref(self, INT2FIX(3));
return rb_f_sprintf(i, str);
}
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