mirror of
https://github.com/opencv/opencv.git
synced 2024-11-25 19:50:38 +08:00
43 lines
1.5 KiB
TeX
43 lines
1.5 KiB
TeX
|
\chapter{FAQ}
|
||
|
|
\section{First Section}
|
||
|
|
\subsection{Initialization}
|
||
|
|
|
||
|
|
\subsubsection*{CreateImage}
|
||
|
|
\addcontentsline{toc}{subsubsection}{CreateImage}
|
||
|
|
|
||
|
|
Creates header and \textsf{allocates} data
|
||
|
|
|
||
|
|
\begin{shaded}
|
||
|
|
\begin{verbatim}
|
||
|
|
IplImage* cvCreateImage( CvSize size,
|
||
|
|
int depth,
|
||
|
|
int channels );
|
||
|
|
\end{verbatim}
|
||
|
|
\end{shaded}
|
||
|
|
|
||
|
|
\begin{description}
|
||
|
|
\item[\texttt{size}] Image width and height
|
||
|
|
\item[\texttt{depth}] Bit depth of image elements. Can be one of:
|
||
|
|
\begin{description}
|
||
|
|
\item[IPL\_DEPTH\_8U] unsigned 8-bit integers
|
||
|
|
\item[IPL\_DEPTH\_8S] signed 8-bit integers
|
||
|
|
\item[IPL\_DEPTH\_16U] unsigned 16-bit integers
|
||
|
|
\item[IPL\_DEPTH\_16S] signed 16-bit integers
|
||
|
|
\item[IPL\_DEPTH\_32S] signed 32-bit integers
|
||
|
|
\item[IPL\_DEPTH\_32F] single precision floating-point numbers
|
||
|
|
\item[IPL\_DEPTH\_64F] double precision floating-point numbers
|
||
|
|
\end{description}
|
||
|
|
\item[\texttt{channels}] Number of channels per element(pixel). Can be 1, 2, 3 or 4. The channels are interleaved, for example the usual data layout of a color image is:
|
||
|
|
\begin{lstlisting}
|
||
|
|
b0 g0 r0 b1 g1 r1 ...
|
||
|
|
\end{lstlisting}
|
||
|
|
Although in general IPL image format can store non-interleaved images as well and some of OpenCV can process it, this function can create interleaved images only.
|
||
|
|
|
||
|
|
\end{description}
|
||
|
|
|
||
|
|
The function cvCreateImage creates the header and allocates data as in the method of~\cite{author_conf_year}. This call is a shortened form of
|
||
|
|
\begin{lstlisting}
|
||
|
|
header = cvCreateImageHeader(size,depth,channels);
|
||
|
|
cvCreateData(header);
|
||
|
|
\end{lstlisting}
|