Sensoray 2246 Manual do Utilizador descarregar pdf (Página 50)

Sample code

See 2246demo code

Setting Custom Merge Method for interlace reconstruction

First set the merge method:

SN_SetMergeMethod( MID2246_FIELDALG_CUST, (mergefunc_t ) custmerge_fields);

Where custmerge_fields follows the mergefunc_t declaration. Finally, define a merge function. Two

examples of a custom merge algorithm are shown below:

/** merge fields

* @param newf pointer to allocated space for new field

* @param size size of newf

* @param f0 pointer to field 0

* @param h0 height of field 0

* @param f1 pointer to field 1 (may be unused in some cases)

* @param h1 height of field 1 (may be unused in some cases)

* @param w width of fields in bytes

* @param pRetW pointer to image width (in Pixels). Modify this to a new value if

* the returned image width is different. Initial value *pRetW = w/3

* @param pRetH pointer to image height. Modify this to a new value if

* the returned image height is different. Initial value *pRetH = h0 + h1

* @return 0 on success, -1 otherwise

int custmerge_fields( BYTE *newf, int size, BYTE *f0, int h0, BYTE *f1,

int h1, int w, int *pRetW, int *pRetH)

{

int i,j,h;

j = 0;

h = (h0 < h1) ? h0 : h1;

for( i=0; i< h; i++, j+=2) {

memcpy( newf + j*w, &f0[i*w], w);

memcpy( newf + (j+1)*w, &f1[i*w], w);

}

return 0;

}

int custmerge_fields_with_clip( BYTE *newf, int size, BYTE *f0, int h0, BYTE *f1,

int h1, int w, int *pRetW, int *pRetH)

{

int i,h,h;

int TrimXLeft = 4; // Require Trimxxx to be multiples of 2

int TrimXRight = 8; // to make line calculations easier.

int TrimYTop = 4;

int TrimYBottom = 6;

int TotalLines;

i = TrimYTop/2;

h = (h0 < h1) ? h0 : h1;

TotalLines = 2*(h - ((TrimYTop+TrimYBottom)/2));

for( j=0; j < TotalLines; i++, j+=2) {

memcpy( newf + ( j *(w - 3*(TrimXLeft+TrimXRight))) ,

&f0[(i*w) + (3*TrimXLeft)],

w - (3*(TrimXLeft+TrimXRight)) ); // 3 bytes per pixel

memcpy( newf + ((j+1)*(w - 3*(TrimXLeft+TrimXRight))) ,

&f1[(i*w) + (3*TrimXLeft)],

w - (3*(TrimXLeft+TrimXRight)) ); // 3 bytes per pixel

}

*pRetW = *pRetW - (TrimXLeft+TrimXRight); // In pixels

*pRetH = TotalLines; // In pixels

return 0;

}

NOTE: The size of BYTE *newf buffer set by size parameter in SN_SnapshotToMem() or CustMergeSize

parameter in SN_SnapshotToFile()

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