Opencv-image reversal and flip

/*
Name: imagereverseandrolover. cpp
Function: Read the BMP image file, reverse and flip the image, and display it on the screen.
*/
/* ===================================================== ==================================================== ===
See http://hi.baidu.com/cateyefish/item/60167fcddfe8a52ce80f2e2ato modify
Cvflip Function
Vertical, horizontal, vertical, and horizontal flip of two-dimensional arrays

Void cvflip (const cvarr * SRC, cvarr * DST = NULL, int flip_mode = 0 );

SRC: original array; DST: Destination array. Internal replacement is implemented when DST = NULL.

Flip_mode specifies the array flip Mode

Flip_mode = 0: Flip along the X axis
Flip_mode> 0: Flip along the Y axis
Flip_mode <0: flipped along the X and Y axes
 
The cvflip function is used to flip an array in one of the following three ways (rows and column subscripts are based on 0 ):
DST (I, j) = SRC (rows (SRC)-i-1, j) If flip_mode = 0
DST (I, j) = SRC (I, cols (src1)-J-1) If flip_mode> 0
DST (I, j) = SRC (rows (SRC)-i-1, cols (SRC)-J-1) If flip_mode <0

Functions are mainly used in:

Vertical flip image (flip_mode> 0) is used to convert the top-left and bottom-left image structures. It is mainly used for video operation in Win32 system.
Horizontal image conversion (flip_mode = 0), using continuous Horizontal conversion and absolute difference check Vertical Axial Symmetry
Horizontal and vertical simultaneous conversion (flip_mode <0) for continuous Horizontal conversion and absolute truth value difference check center Symmetry
Flip the order of the 1-dimensional pointer array (flip_mode> 0)
*/

# Include <iostream> # include <opencv2/CORE/core. HPP> # include <opencv2/imgproc. HPP> # include <opencv2/highgui. HPP> using namespace STD; using namespace CV; int main () {iplimage * psrcimg = NULL; iplimage * cursor = NULL; iplimage * proverselnimg = NULL; psrcimg = cvloadimage ("D: \ lena.bmp ", 0); // cvloadimage (filename,-1); default number of original channels for image reading // cvloadimage (filename, 0 ); forcibly convert the read image to a grayscale image // cvloadimage (filename, 1); read the color image if (psrcimg = NULL) {cout <"fail to load image" <Endl; return-1;} proloverlnimg = cvcloneimage (psrcimg); proverselnimg = cvcloneimage (psrcimg); If (proloverlnimg = NULL) & (proverselnimg = NULL )) {cout <"fail to clone the image" <Endl; Return-1 ;}// image flip processing ----------------------------------- cvflip (proloverlnimg, null, 0 ); // load the image to flip up or down the X axis // ------------------------------------ image reverse processing ---------------------------- int length, width, step, channel; uchar * data; int I, J, K; length = proverselnimg-> height; width = proverselnimg-> width; step = proverselnimg-> widthstep; Channel = proverselnimg-> nchannels; Data = (uchar *) proverselnimg-> imagedata; for (I = 0; I <length; I ++) {for (j = 0; j <width; j ++) {for (k = 0; k <channel; k ++) {data [I * Step + J * channel + k] = 255-data [I * Step + J * channel + k] ;}} //************************************** **************************************** * ********* // cvnamedwindow ("src ", 0); // 0 indicates that the image is displayed with a fixed window size. If no value is input, cvnamedwindow ("src") is the same as the original image size by default. cvnamedwindow ("xturnover "); cvnamedwindow ("picreverse"); cvshowimage ("src", psrcimg); cvshowimage ("xturnover", signature); cvshowimage ("picreverse", proverselnimg); cvwaitkey (0 ); cvreleaseimage (& psrcimg); cvreleaseimage (& images); cvdestroywindow ("src"); cvdestroywindow ("xturnover"); cvdestroywindow ("picreverse "); return 0 ;}