OpenCV：widthStep vs step( 二 ) _2410

    char colorModel[4];     /* Ignored by OpenCV */
    char channelSeq[4];     /* ditto */
    int dataOrder;         /* 0 - interleaved color channels, 1 - separate color channels.
                               cvCreateImage can only create interleaved images */
    int origin; /* 0 - top-left origin, 1 - bottom-left origin (Windows bitmaps style). */
    int align; /* Alignment of image rows (4 or 8). OpenCV ignores it and uses widthStep instead. */
    int width;             /* Image width in pixels.                           */
    int height;            /* Image height in pixels.                          */
    struct _IplROI *roi;    /* Image ROI. If NULL, the whole image is selected. */
    struct _IplImage *maskROI;      /* Must be NULL. */
    void *imageId;                 /* "           " */
    struct _IplTileInfo *tileInfo; /* "           " */
    int imageSize; /* Image data size in bytes (==image->height*image->widthStep in case of interleaved data)*/
    char *imageData;        /* Pointer to aligned image data.         */
    int widthStep;         /* Size of aligned image row in bytes.    */
    int BorderMode[4];     /* Ignored by OpenCV.                     */
    int BorderConst[4];    /* Ditto.                                 */
    char *imageDataOrigin; /* Pointer to very origin of image data (not necessarily aligned) -
                               needed for correct deallocation */
}IplImage;

3IplImage*拜候图像像素：widthStep
对8bit ，单通道， unsigned char类型的图像I---IplImage* img：
I(x, y)~((unsigned char*)(img->imageData+img->widthStep*y))[x];
对8bit ， 3通道， unsigned char类型的图像I---IplImage* img：
I(x, y)blue~((unsigned char*)(img->imageData+img->widthStep*y))[x*3];
I(x, y)green~((unsigned char*)(img->imageData+img->widthStep*y))[x*3+1];
I(x, y)red~((unsigned char*)(img->imageData+img->widthStep*y))[x*3+2];

OpenCV：widthStep vs step( 二 )

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