I want to read the image by opencv and i faced the problem to transform the type of cv mat to matrix rgb pixel.
Check cv mat type.
Type has the same meaning as in cvcreatemat.
I used img cols instead and everything worked fine.
Here are the some popular ones.
While cv mat is sufficient in most cases cv mat can be more convenient if you use a lot of element access operations and if you know matrix type at compile time.
Using cv mat create nrows ncols type method or the similar constructor cv mat mat nrows ncols type fill value constructor.
Making borders for images padding if you want to create a border around the image something like a photo frame you can use cv copymakeborder function.
A new matrix of the specified size and specifed type will be allocated.
If yes process them as a long single row.
If matrix is of type cv 8s then use mat at schar y x.
But it has more applications for convolution operation zero padding etc.
Possible parameter names for matrix cv mat.
Jshtok 2015 04 28 01 16 49 0500 edit.
The name starts with a lower or upper case character hence a value between a z or a z.
The parameters which you add to the cv mat must have a name which fits to the following rules.
The first character of the name can be followed by an infinite number of alpha numerical characters including characters like or.
If matrix is of type cv 16u then use mat at ushort y x.
Hi the dnn imagenet ex cpp example in line 141 load image as a matrix rgb pixel.
Not sure but maybe is the problem is on the matrix type conversion i suggest to use the cv definition instead the int value.
Using img step for the stepsize did not work for me with a float type matrix opencv type cv 32fc1.
Note that cv mat at tp int y int x and cv mat tp operator int y int x do absolutely the same thing and run at the same speed but the latter is certainly shorter.
It makes sense to check whether all the input output arrays are continuous namely have no gaps at the end of each row.
There are many different ways to create cv mat object.
