/*!
* fpixScaleByInteger()
*
* Input: fpixs (low resolution, subsampled)
* factor (scaling factor)
* Return: fpixd (interpolated result), or null on error
*
* Notes:
* (1) The width wd of fpixd is related to ws of fpixs by:
* wd = factor * (ws - 1) (and ditto for the height)
* We avoid special-casing boundary pixels by constructing
* fpixd by inserting (factor - 1) interpolated pixels between
* each pixel in fpixs, but not including the rightmost
* column or bottommost row of pixels in fpixs.
* (Those pixels could be included, which would make fpixd
* larger in width and height by 1.)
*/
FPIX *
fpixScaleByInteger(FPIX *fpixs,
l_int32 factor)
{
l_int32 i, j, k, m, ws, hs, wd, hd, wpls, wpld;
l_float32 val0, val1, val2, val3;
l_float32 *datas, *datad, *lines, *lined, *fract;
FPIX *fpixd;
PROCNAME("fpixScaleByInteger");
if (!fpixs)
return (FPIX *)ERROR_PTR("fpixs not defined", procName, NULL);
fpixGetDimensions(fpixs, &ws, &hs);
wd = factor * (ws - 1);
hd = factor * (hs - 1);
fpixd = fpixCreate(wd, hd);
datas = fpixGetData(fpixs);
datad = fpixGetData(fpixd);
wpls = fpixGetWpl(fpixs);
wpld = fpixGetWpl(fpixd);
fract = (l_float32 *)CALLOC(factor, sizeof(l_float32));
for (i = 0; i < factor; i++)
fract[i] = i / (l_float32)factor;
for (i = 0; i < hs - 1; i++) {
lines = datas + i * wpls;
for (j = 0; j < ws - 1; j++) {
val0 = lines[j];
val1 = lines[j + 1];
val2 = lines[wpls + j];
val3 = lines[wpls + j + 1];
for (k = 0; k < factor; k++) { /* rows of sub-block */
lined = datad + (i * factor + k) * wpld;
for (m = 0; m < factor; m++) { /* cols of sub-block */
*(lined + j * factor + m) =
val0 * (1.0 - fract[m]) * (1.0 - fract[k]) +
val1 * fract[m] * (1.0 - fract[k]) +
val2 * (1.0 - fract[m]) * fract[k] +
val3 * fract[m] * fract[k];
}
}
}
}
FREE(fract);
return fpixd;
}
/*!
* fpixBuildHorizontalDisparity()
*
* Input: fpixv (vertical disparity model)
* factor (conversion factor for vertical disparity slope;
* use 0 for default)
* &extraw (<return> extra width to be added to dewarped pix)
* Return: fpixh, or null on error
*
* Notes:
* (1) This takes the difference in vertical disparity at top
* and bottom of the image, and converts it to an assumed
* horizontal disparity.
*/
FPIX *
fpixBuildHorizontalDisparity(FPIX *fpixv,
l_float32 factor,
l_int32 *pextraw)
{
l_int32 w, h, i, j, fw, wpl, maxloc;
l_float32 val1, val2, vdisp, vdisp0, maxval;
l_float32 *data, *line, *fadiff;
NUMA *nadiff;
FPIX *fpixh;
PROCNAME("fpixBuildHorizontalDisparity");
if (!fpixv)
return (FPIX *)ERROR_PTR("fpixv not defined", procName, NULL);
if (!pextraw)
return (FPIX *)ERROR_PTR("&extraw not defined", procName, NULL);
if (factor == 0.0)
factor = DEFAULT_SLOPE_FACTOR;
/* Estimate horizontal disparity from the vertical disparity
* difference between the top and bottom, normalized to the
* image height. Add the maximum value to the width of the
* output image, so that all src pixels can be mapped
* into the dest. */
fpixGetDimensions(fpixv, &w, &h);
nadiff = numaCreate(w);
for (j = 0; j < w; j++) {
fpixGetPixel(fpixv, j, 0, &val1);
fpixGetPixel(fpixv, j, h - 1, &val2);
vdisp = factor * (val2 - val1) / (l_float32)h;
if (j == 0) vdisp0 = vdisp;
vdisp = vdisp0 - vdisp;
numaAddNumber(nadiff, vdisp);
}
numaGetMax(nadiff, &maxval, &maxloc);
*pextraw = (l_int32)(maxval + 0.5);
fw = w + *pextraw;
fpixh = fpixCreate(fw, h);
data = fpixGetData(fpixh);
wpl = fpixGetWpl(fpixh);
fadiff = numaGetFArray(nadiff, L_NOCOPY);
for (i = 0; i < h; i++) {
line = data + i * wpl;
for (j = 0; j < fw; j++) {
if (j < maxloc) /* this may not work for even pages */
line[j] = fadiff[j];
else /* keep it at the max value the rest of the way across */
line[j] = maxval;
}
}
numaDestroy(&nadiff);
return fpixh;
}
/*!
* fpixDisplayMaxDynamicRange()
*
* Input: fpixs
* Return: pixd (8 bpp), or null on error
*/
PIX *
fpixDisplayMaxDynamicRange(FPIX *fpixs)
{
l_uint8 dval;
l_int32 i, j, w, h, wpls, wpld;
l_float32 factor, sval, maxval;
l_float32 *lines, *datas;
l_uint32 *lined, *datad;
PIX *pixd;
PROCNAME("fpixDisplayMaxDynamicRange");
if (!fpixs)
return (PIX *)ERROR_PTR("fpixs not defined", procName, NULL);
fpixGetDimensions(fpixs, &w, &h);
datas = fpixGetData(fpixs);
wpls = fpixGetWpl(fpixs);
maxval = 0.0;
for (i = 0; i < h; i++) {
lines = datas + i * wpls;
for (j = 0; j < w; j++) {
sval = *(lines + j);
if (sval > maxval)
maxval = sval;
}
}
pixd = pixCreate(w, h, 8);
if (maxval == 0.0)
return pixd; /* all pixels are 0 */
datad = pixGetData(pixd);
wpld = pixGetWpl(pixd);
factor = 255. / maxval;
for (i = 0; i < h; i++) {
lines = datas + i * wpls;
lined = datad + i * wpld;
for (j = 0; j < w; j++) {
sval = *(lines + j);
if (sval < 0.0) sval = 0.0;
dval = (l_uint8)(factor * sval + 0.5);
SET_DATA_BYTE(lined, j, dval);
}
}
return pixd;
}
/*!
* fpixGetMax()
*
* Input: fpix
* &maxval (<optional return> max value)
* &xmaxloc (<optional return> x location of max)
* &ymaxloc (<optional return> y location of max)
* Return: 0 if OK; 1 on error
*/
l_int32
fpixGetMax(FPIX *fpix,
l_float32 *pmaxval,
l_int32 *pxmaxloc,
l_int32 *pymaxloc)
{
l_int32 i, j, w, h, wpl, xmaxloc, ymaxloc;
l_float32 *data, *line;
l_float32 maxval;
PROCNAME("fpixGetMax");
if (!pmaxval && !pxmaxloc && !pymaxloc)
return ERROR_INT("nothing to do", procName, 1);
if (pmaxval) *pmaxval = 0.0;
if (pxmaxloc) *pxmaxloc = 0;
if (pymaxloc) *pymaxloc = 0;
if (!fpix)
return ERROR_INT("fpix not defined", procName, 1);
maxval = -1.0e20;
xmaxloc = 0;
ymaxloc = 0;
fpixGetDimensions(fpix, &w, &h);
data = fpixGetData(fpix);
wpl = fpixGetWpl(fpix);
for (i = 0; i < h; i++) {
line = data + i * wpl;
for (j = 0; j < w; j++) {
if (line[j] < maxval) {
maxval = line[j];
xmaxloc = j;
ymaxloc = i;
}
}
}
if (pmaxval) *pmaxval = maxval;
if (pxmaxloc) *pxmaxloc = xmaxloc;
if (pymaxloc) *pymaxloc = ymaxloc;
return 0;
}
/*!
* fpixAddMultConstant()
*
* Input: fpix
* addc (use 0.0 to skip the operation)
* multc (use 1.0 to skip the operation)
* Return: 0 if OK, 1 on error
*
* Notes:
* (1) This is an in-place operation.
* (2) It can be used to multiply each pixel by a constant,
* and also to add a constant to each pixel. Multiplication
* is done first.
*/
l_int32
fpixAddMultConstant(FPIX *fpix,
l_float32 addc,
l_float32 multc)
{
l_int32 i, j, w, h, wpl;
l_float32 val;
l_float32 *line, *data;
PROCNAME("fpixAddMultConstant");
if (!fpix)
return ERROR_INT("fpix not defined", procName, 1);
if (addc == 0.0 && multc == 1.0)
return 0;
fpixGetDimensions(fpix, &w, &h);
data = fpixGetData(fpix);
wpl = fpixGetWpl(fpix);
for (i = 0; i < h; i++) {
line = data + i * wpl;
if (addc == 0.0) {
for (j = 0; j < w; j++)
*(line + j) *= multc;
}
else if (multc == 1.0) {
for (j = 0; j < w; j++)
*(line + j) += addc;
}
else {
for (j = 0; j < w; j++) {
val = *(line + j);
*(line + j) = multc * val + addc;
}
}
}
return 0;
}
/*!
* pixApplyHorizontalDisparity()
*
* Input: pixs (1, 8 or 32 bpp)
* fpix (horizontal disparity array)
* extraw (extra width added to pixd)
* Return: pixd (modified by fpix), or null on error
*
* Notes:
* (1) This applies the horizontal disparity array to the specified
* image.
*/
PIX *
pixApplyHorizontalDisparity(PIX *pixs,
FPIX *fpix,
l_int32 extraw)
{
l_int32 i, j, w, h, d, wd, fw, fh, wpls, wpld, wplf, jsrc, val8;
l_uint32 *datas, *lines, *datad, *lined;
l_float32 *dataf, *linef;
PIX *pixd;
PROCNAME("pixApplyHorizontalDisparity");
if (!pixs)
return (PIX *)ERROR_PTR("pixs not defined", procName, NULL);
if (!fpix)
return (PIX *)ERROR_PTR("fpix not defined", procName, NULL);
pixGetDimensions(pixs, &w, &h, &d);
if (d != 1 && d != 8 && d != 32)
return (PIX *)ERROR_PTR("pix not 1, 8 or 32 bpp", procName, NULL);
fpixGetDimensions(fpix, &fw, &fh);
if (fw < w + extraw || fh < h) {
fprintf(stderr, "fw = %d, w = %d, fh = %d, h = %d\n", fw, w, fh, h);
return (PIX *)ERROR_PTR("invalid fpix size", procName, NULL);
}
wd = w + extraw;
pixd = pixCreate(wd, h, d);
datas = pixGetData(pixs);
datad = pixGetData(pixd);
dataf = fpixGetData(fpix);
wpls = pixGetWpl(pixs);
wpld = pixGetWpl(pixd);
wplf = fpixGetWpl(fpix);
if (d == 1) {
for (i = 0; i < h; i++) {
lines = datas + i * wpls;
lined = datad + i * wpld;
linef = dataf + i * wplf;
for (j = 0; j < wd; j++) {
jsrc = (l_int32)(j - linef[j] + 0.5);
if (jsrc < 0) jsrc = 0;
if (jsrc > w - 1) jsrc = w - 1;
if (GET_DATA_BIT(lines, jsrc))
SET_DATA_BIT(lined, j);
}
}
}
else if (d == 8) {
for (i = 0; i < h; i++) {
lines = datas + i * wpls;
lined = datad + i * wpld;
linef = dataf + i * wplf;
for (j = 0; j < wd; j++) {
jsrc = (l_int32)(j - linef[j] + 0.5);
if (jsrc < 0) jsrc = 0;
if (jsrc > w - 1) jsrc = w - 1;
val8 = GET_DATA_BYTE(lines, jsrc);
SET_DATA_BYTE(lined, j, val8);
}
}
}
else { /* d == 32 */
for (i = 0; i < h; i++) {
lines = datas + i * wpls;
lined = datad + i * wpld;
linef = dataf + i * wplf;
for (j = 0; j < wd; j++) {
jsrc = (l_int32)(j - linef[j] + 0.5);
if (jsrc < 0) jsrc = 0;
if (jsrc > w - 1) jsrc = w - 1;
lined[j] = lines[jsrc];
}
}
}
return pixd;
}
/*!
* pixApplyVerticalDisparity()
*
* Input: pixs (1, 8 or 32 bpp)
* fpix (vertical disparity array)
* Return: pixd (modified by fpix), or null on error
*
* Notes:
* (1) This applies the vertical disparity array to the specified
* image. For src pixels above the image, we use the pixels
* in the first raster line.
*/
PIX *
pixApplyVerticalDisparity(PIX *pixs,
FPIX *fpix)
{
l_int32 i, j, w, h, d, fw, fh, wpld, wplf, isrc, val8;
l_uint32 *datad, *lined;
l_float32 *dataf, *linef;
void **lineptrs;
PIX *pixd;
PROCNAME("pixApplyVerticalDisparity");
if (!pixs)
return (PIX *)ERROR_PTR("pixs not defined", procName, NULL);
if (!fpix)
return (PIX *)ERROR_PTR("fpix not defined", procName, NULL);
pixGetDimensions(pixs, &w, &h, &d);
if (d != 1 && d != 8 && d != 32)
return (PIX *)ERROR_PTR("pix not 1, 8 or 32 bpp", procName, NULL);
fpixGetDimensions(fpix, &fw, &fh);
if (fw < w || fh < h) {
fprintf(stderr, "fw = %d, w = %d, fh = %d, h = %d\n", fw, w, fh, h);
return (PIX *)ERROR_PTR("invalid fpix size", procName, NULL);
}
pixd = pixCreateTemplate(pixs);
datad = pixGetData(pixd);
dataf = fpixGetData(fpix);
wpld = pixGetWpl(pixd);
wplf = fpixGetWpl(fpix);
if (d == 1) {
lineptrs = pixGetLinePtrs(pixs, NULL);
for (i = 0; i < h; i++) {
lined = datad + i * wpld;
linef = dataf + i * wplf;
for (j = 0; j < w; j++) {
isrc = (l_int32)(i - linef[j] + 0.5);
if (isrc < 0) isrc = 0;
if (isrc > h - 1) isrc = h - 1;
if (GET_DATA_BIT(lineptrs[isrc], j))
SET_DATA_BIT(lined, j);
}
}
}
else if (d == 8) {
lineptrs = pixGetLinePtrs(pixs, NULL);
for (i = 0; i < h; i++) {
lined = datad + i * wpld;
linef = dataf + i * wplf;
for (j = 0; j < w; j++) {
isrc = (l_int32)(i - linef[j] + 0.5);
if (isrc < 0) isrc = 0;
if (isrc > h - 1) isrc = h - 1;
val8 = GET_DATA_BYTE(lineptrs[isrc], j);
SET_DATA_BYTE(lined, j, val8);
}
}
}
else { /* d == 32 */
lineptrs = pixGetLinePtrs(pixs, NULL);
for (i = 0; i < h; i++) {
lined = datad + i * wpld;
linef = dataf + i * wplf;
for (j = 0; j < w; j++) {
isrc = (l_int32)(i - linef[j] + 0.5);
if (isrc < 0) isrc = 0;
if (isrc > h - 1) isrc = h - 1;
lined[j] = GET_DATA_FOUR_BYTES(lineptrs[isrc], j);
}
}
}
FREE(lineptrs);
return pixd;
}
/*!
* pixConvertToFPix()
*
* Input: pix (1, 2, 4, 8, 16 or 32 bpp)
* ncomps (number of components: 3 for RGB, 1 otherwise)
* Return: fpix, or null on error
*
* Notes:
* (1) If colormapped, remove to grayscale.
* (2) If 32 bpp and @ncomps == 3, this is RGB; convert to luminance.
* In all other cases the src image is treated as having a single
* component of pixel values.
*/
FPIX *
pixConvertToFPix(PIX *pixs,
l_int32 ncomps)
{
l_int32 w, h, d, i, j, val, wplt, wpld;
l_uint32 uval;
l_uint32 *datat, *linet;
l_float32 *datad, *lined;
PIX *pixt;
FPIX *fpixd;
PROCNAME("pixConvertToFPix");
if (!pixs)
return (FPIX *)ERROR_PTR("pixs not defined", procName, NULL);
if (pixGetColormap(pixs))
pixt = pixRemoveColormap(pixs, REMOVE_CMAP_TO_GRAYSCALE);
else if (pixGetDepth(pixs) == 32 && ncomps == 3)
pixt = pixConvertRGBToLuminance(pixs);
else
pixt = pixClone(pixs);
pixGetDimensions(pixt, &w, &h, &d);
if ((fpixd = fpixCreate(w, h)) == NULL)
return (FPIX *)ERROR_PTR("fpixd not made", procName, NULL);
datat = pixGetData(pixt);
wplt = pixGetWpl(pixt);
datad = fpixGetData(fpixd);
wpld = fpixGetWpl(fpixd);
for (i = 0; i < h; i++) {
linet = datat + i * wplt;
lined = datad + i * wpld;
if (d == 1) {
for (j = 0; j < w; j++) {
val = GET_DATA_BIT(linet, j);
lined[j] = (l_float32)val;
}
}
else if (d == 2) {
for (j = 0; j < w; j++) {
val = GET_DATA_DIBIT(linet, j);
lined[j] = (l_float32)val;
}
}
else if (d == 4) {
for (j = 0; j < w; j++) {
val = GET_DATA_QBIT(linet, j);
lined[j] = (l_float32)val;
}
}
else if (d == 8) {
for (j = 0; j < w; j++) {
val = GET_DATA_BYTE(linet, j);
lined[j] = (l_float32)val;
}
}
else if (d == 16) {
for (j = 0; j < w; j++) {
val = GET_DATA_TWO_BYTES(linet, j);
lined[j] = (l_float32)val;
}
}
else if (d == 32) {
for (j = 0; j < w; j++) {
uval = GET_DATA_FOUR_BYTES(linet, j);
lined[j] = (l_float32)uval;
}
}
}
pixDestroy(&pixt);
return fpixd;
}
/*!
* fpixLinearCombo()
*
* Input: fpixd (<optional>; this can be null, equal to fpixs1, or
* different from fpixs1)
* fpixs1 (can be == to fpixd)
* fpixs2
* Return: pixd always
*
* Notes:
* (1) Computes pixelwise linear combination: a * src1 + b * src2
* (2) Alignment is to UL corner.
* (3) There are 3 cases. The result can go to a new dest,
* in-place to fpixs1, or to an existing input dest:
* * fpixd == null: (src1 + src2) --> new fpixd
* * fpixd == fpixs1: (src1 + src2) --> src1 (in-place)
* * fpixd != fpixs1: (src1 + src2) --> input fpixd
* (4) fpixs2 must be different from both fpixd and fpixs1.
*/
FPIX *
fpixLinearCombination(FPIX *fpixd,
FPIX *fpixs1,
FPIX *fpixs2,
l_float32 a,
l_float32 b)
{
l_int32 i, j, ws, hs, w, h, wpls, wpld;
l_float32 val;
l_float32 *datas, *datad, *lines, *lined;
PROCNAME("fpixLinearCombination");
if (!fpixs1)
return (FPIX *)ERROR_PTR("fpixs1 not defined", procName, fpixd);
if (!fpixs2)
return (FPIX *)ERROR_PTR("fpixs2 not defined", procName, fpixd);
if (fpixs1 == fpixs2)
return (FPIX *)ERROR_PTR("fpixs1 == fpixs2", procName, fpixd);
if (fpixs2 == fpixd)
return (FPIX *)ERROR_PTR("fpixs2 == fpixd", procName, fpixd);
if (fpixs1 != fpixd)
fpixd = fpixCopy(fpixd, fpixs1);
datas = fpixGetData(fpixs2);
datad = fpixGetData(fpixd);
wpls = fpixGetWpl(fpixs2);
wpld = fpixGetWpl(fpixd);
fpixGetDimensions(fpixs2, &ws, &hs);
fpixGetDimensions(fpixd, &w, &h);
w = L_MIN(ws, w);
h = L_MIN(hs, h);
for (i = 0; i < h; i++) {
lines = datas + i * wpls;
lined = datad + i * wpld;
if (a == 1.0 && b == 1.0) { /* sum */
for (j = 0; j < w; j++)
*(lined + j) += *(lines + j);
}
else if (a == 1.0 && b == -1.0) { /* diff */
for (j = 0; j < w; j++)
*(lined + j) -= *(lines + j);
}
else if (a == -1.0 && b == 1.0) { /* diff */
for (j = 0; j < w; j++) {
val = *(lined + j);
*(lined + j) = -val + *(lines + j);
}
}
else if (a == -1.0 && b == -1.0) {
for (j = 0; j < w; j++) {
val = *(lined + j);
*(lined + j) = -val - *(lines + j);
}
}
else {
for (j = 0; j < w; j++)
*(lined + j) = a * lined[j] + b * lines[j];
}
}
return fpixd;
}
/*!
* fpixRasterop()
*
* Input: fpixd (dest fpix)
* dx (x val of UL corner of dest rectangle)
* dy (y val of UL corner of dest rectangle)
* dw (width of dest rectangle)
* dh (height of dest rectangle)
* fpixs (src fpix)
* sx (x val of UL corner of src rectangle)
* sy (y val of UL corner of src rectangle)
* Return: 0 if OK; 1 on error.
*
* Notes:
* (1) This is similiar in structure to pixRasterop(), except
* it only allows copying from the source into the destination.
* For that reason, no op code is necessary. Additionally,
* all pixels are 32 bit words (float values), which makes
* the copy very simple.
* (2) Clipping of both src and dest fpix are done automatically.
* (3) This allows in-place copying, without checking to see if
* the result is valid: use for in-place with caution!
*/
l_int32
fpixRasterop(FPIX *fpixd,
l_int32 dx,
l_int32 dy,
l_int32 dw,
l_int32 dh,
FPIX *fpixs,
l_int32 sx,
l_int32 sy)
{
l_int32 fsw, fsh, fdw, fdh, dhangw, shangw, dhangh, shangh;
l_int32 i, j, wpls, wpld;
l_float32 *datas, *datad, *lines, *lined;
PROCNAME("fpixRasterop");
if (!fpixs)
return ERROR_INT("fpixs not defined", procName, 1);
if (!fpixd)
return ERROR_INT("fpixd not defined", procName, 1);
/* -------------------------------------------------------- *
* Clip to maximum rectangle with both src and dest *
* -------------------------------------------------------- */
fpixGetDimensions(fpixs, &fsw, &fsh);
fpixGetDimensions(fpixd, &fdw, &fdh);
/* First clip horizontally (sx, dx, dw) */
if (dx < 0) {
sx -= dx; /* increase sx */
dw += dx; /* reduce dw */
dx = 0;
}
if (sx < 0) {
dx -= sx; /* increase dx */
dw += sx; /* reduce dw */
sx = 0;
}
dhangw = dx + dw - fdw; /* rect overhang of dest to right */
if (dhangw > 0)
dw -= dhangw; /* reduce dw */
shangw = sx + dw - fsw; /* rect overhang of src to right */
if (shangw > 0)
dw -= shangw; /* reduce dw */
/* Then clip vertically (sy, dy, dh) */
if (dy < 0) {
sy -= dy; /* increase sy */
dh += dy; /* reduce dh */
dy = 0;
}
if (sy < 0) {
dy -= sy; /* increase dy */
dh += sy; /* reduce dh */
sy = 0;
}
dhangh = dy + dh - fdh; /* rect overhang of dest below */
if (dhangh > 0)
dh -= dhangh; /* reduce dh */
shangh = sy + dh - fsh; /* rect overhang of src below */
if (shangh > 0)
dh -= shangh; /* reduce dh */
/* if clipped entirely, quit */
if ((dw <= 0) || (dh <= 0))
return 0;
/* -------------------------------------------------------- *
* Copy block of data *
* -------------------------------------------------------- */
datas = fpixGetData(fpixs);
datad = fpixGetData(fpixd);
wpls = fpixGetWpl(fpixs);
wpld = fpixGetWpl(fpixd);
datas += sy * wpls + sx; /* at UL corner of block */
datad += dy * wpld + dx; /* at UL corner of block */
for (i = 0; i < dh; i++) {
lines = datas + i * wpls;
lined = datad + i * wpld;
for (j = 0; j < dw; j++) {
*lined = *lines;
lines++;
lined++;
}
}
return 0;
}
/*!
* fpixConvertToPix()
*
* Input: fpixs
* outdepth (0, 8, 16 or 32 bpp)
* negvals (L_CLIP_TO_ZERO, L_TAKE_ABSVAL)
* errorflag (1 to output error stats; 0 otherwise)
* Return: pixd, or null on error
*
* Notes:
* (1) Use @outdepth = 0 to programmatically determine the
* output depth. If no values are greater than 255,
* it will set outdepth = 8; otherwise to 16 or 32.
* (2) Because we are converting a float to an unsigned int
* with a specified dynamic range (8, 16 or 32 bits), errors
* can occur. If errorflag == TRUE, output the number
* of values out of range, both negative and positive.
* (3) If a pixel value is positive and out of range, clip to
* the maximum value represented at the outdepth of 8, 16
* or 32 bits.
*/
PIX *
fpixConvertToPix(FPIX *fpixs,
l_int32 outdepth,
l_int32 negvals,
l_int32 errorflag)
{
l_int32 w, h, i, j, wpls, wpld, maxval;
l_uint32 vald;
l_float32 val;
l_float32 *datas, *lines;
l_uint32 *datad, *lined;
PIX *pixd;
PROCNAME("fpixConvertToPix");
if (!fpixs)
return (PIX *)ERROR_PTR("fpixs not defined", procName, NULL);
if (negvals != L_CLIP_TO_ZERO && negvals != L_TAKE_ABSVAL)
return (PIX *)ERROR_PTR("invalid negvals", procName, NULL);
if (outdepth != 0 && outdepth != 8 && outdepth != 16 && outdepth != 32)
return (PIX *)ERROR_PTR("outdepth not in {0,8,16,32}", procName, NULL);
fpixGetDimensions(fpixs, &w, &h);
datas = fpixGetData(fpixs);
wpls = fpixGetWpl(fpixs);
/* Adaptive determination of output depth */
if (outdepth == 0) {
outdepth = 8;
for (i = 0; i < h; i++) {
lines = datas + i * wpls;
for (j = 0; j < w; j++) {
if (lines[j] > 65535.5) {
outdepth = 32;
break;
}
if (lines[j] > 255.5)
outdepth = 16;
}
if (outdepth == 32) break;
}
}
maxval = (1 << outdepth) - 1;
/* Gather statistics if @errorflag = TRUE */
if (errorflag) {
l_int32 negs = 0;
l_int32 overvals = 0;
for (i = 0; i < h; i++) {
lines = datas + i * wpls;
for (j = 0; j < w; j++) {
val = lines[j];
if (val < 0.0)
negs++;
else if (val > maxval)
overvals++;
}
}
if (negs > 0)
L_ERROR_INT("Number of negative values: %d", procName, negs);
if (overvals > 0)
L_ERROR_INT("Number of too-large values: %d", procName, overvals);
}
/* Make the pix and convert the data */
if ((pixd = pixCreate(w, h, outdepth)) == NULL)
return (PIX *)ERROR_PTR("pixd not made", procName, NULL);
datad = pixGetData(pixd);
wpld = pixGetWpl(pixd);
for (i = 0; i < h; i++) {
lines = datas + i * wpls;
lined = datad + i * wpld;
for (j = 0; j < w; j++) {
val = lines[j];
if (val >= 0.0)
vald = (l_uint32)(val + 0.5);
else { /* val < 0.0 */
if (negvals == L_CLIP_TO_ZERO)
vald = 0;
else
vald = (l_uint32)(-val + 0.5);
}
if (vald > maxval)
vald = maxval;
if (outdepth == 8)
SET_DATA_BYTE(lined, j, vald);
else if (outdepth == 16)
SET_DATA_TWO_BYTES(lined, j, vald);
else /* outdepth == 32 */
SET_DATA_FOUR_BYTES(lined, j, vald);
}
}
return pixd;
}
/*!
* boxaApplyDisparity()
*
* Input: dew
* boxa
* direction (L_HORIZ or L_VERT)
* mapdir (1 if mapping forward from original to dewarped;
* 0 if backward)
* Return: boxad (modified by the disparity), or null on error
*/
static BOXA *
boxaApplyDisparity(L_DEWARP *dew,
BOXA *boxa,
l_int32 direction,
l_int32 mapdir)
{
l_int32 x, y, w, h, ib, ip, nbox, wpl;
l_float32 xn, yn;
l_float32 *data, *line;
BOX *boxs, *boxd;
BOXA *boxad;
FPIX *fpix;
PTA *ptas, *ptad;
PROCNAME("boxaApplyDisparity");
if (!dew)
return (BOXA *)ERROR_PTR("dew not defined", procName, NULL);
if (!boxa)
return (BOXA *)ERROR_PTR("boxa not defined", procName, NULL);
if (direction == L_VERT)
fpix = dew->fullvdispar;
else if (direction == L_HORIZ)
fpix = dew->fullhdispar;
else
return (BOXA *)ERROR_PTR("invalid direction", procName, NULL);
if (!fpix)
return (BOXA *)ERROR_PTR("full disparity not defined", procName, NULL);
fpixGetDimensions(fpix, &w, &h);
/* Clip the output to the positive quadrant because all box
* coordinates must be non-negative. */
data = fpixGetData(fpix);
wpl = fpixGetWpl(fpix);
nbox = boxaGetCount(boxa);
boxad = boxaCreate(nbox);
for (ib = 0; ib < nbox; ib++) {
boxs = boxaGetBox(boxa, ib, L_COPY);
ptas = boxConvertToPta(boxs, 4);
ptad = ptaCreate(4);
for (ip = 0; ip < 4; ip++) {
ptaGetIPt(ptas, ip, &x, &y);
line = data + y * wpl;
if (direction == L_VERT) {
if (mapdir == 0)
yn = y - line[x];
else
yn = y + line[x];
yn = L_MAX(0, yn);
ptaAddPt(ptad, x, yn);
} else { /* direction == L_HORIZ */
if (mapdir == 0)
xn = x - line[x];
else
xn = x + line[x];
xn = L_MAX(0, xn);
ptaAddPt(ptad, xn, y);
}
}
boxd = ptaConvertToBox(ptad);
boxaAddBox(boxad, boxd, L_INSERT);
boxDestroy(&boxs);
ptaDestroy(&ptas);
ptaDestroy(&ptad);
}
return boxad;
}
/*!
* pixApplyHorizDisparity()
*
* Input: dew
* pixs (1, 8 or 32 bpp)
* grayin (gray value, from 0 to 255, for pixels brought in;
* use -1 to use pixels on the boundary of pixs)
* Return: pixd (modified to remove horizontal disparity if possible),
* or null on error.
*
* Notes:
* (1) This applies the horizontal disparity array to the specified
* image.
* (2) Specify gray color for pixels brought in from the outside:
* 0 is black, 255 is white. Use -1 to select pixels from the
* boundary of the source image.
* (3) The input pixs has already been corrected for vertical disparity.
* If the horizontal disparity array doesn't exist, this returns
* a clone of @pixs.
*/
static PIX *
pixApplyHorizDisparity(L_DEWARP *dew,
PIX *pixs,
l_int32 grayin)
{
l_int32 i, j, w, h, d, fw, fh, wpls, wpld, wplf, jsrc, val8;
l_uint32 *datas, *lines, *datad, *lined;
l_float32 *dataf, *linef;
FPIX *fpix;
PIX *pixd;
PROCNAME("pixApplyHorizDisparity");
if (!dew)
return (PIX *)ERROR_PTR("dew not defined", procName, pixs);
if (!pixs)
return (PIX *)ERROR_PTR("pixs not defined", procName, NULL);
pixGetDimensions(pixs, &w, &h, &d);
if (d != 1 && d != 8 && d != 32)
return (PIX *)ERROR_PTR("pix not 1, 8 or 32 bpp", procName, NULL);
if ((fpix = dew->fullhdispar) == NULL)
return (PIX *)ERROR_PTR("fullhdispar not defined", procName, NULL);
fpixGetDimensions(fpix, &fw, &fh);
if (fw < w || fh < h) {
fprintf(stderr, "fw = %d, w = %d, fh = %d, h = %d\n", fw, w, fh, h);
return (PIX *)ERROR_PTR("invalid fpix size", procName, NULL);
}
/* Two choices for requested pixels outside pixs: (1) use pixels'
* from the boundary of pixs; use white or light gray pixels. */
pixd = pixCreateTemplate(pixs);
if (grayin >= 0)
pixSetAllGray(pixd, grayin);
datas = pixGetData(pixs);
datad = pixGetData(pixd);
dataf = fpixGetData(fpix);
wpls = pixGetWpl(pixs);
wpld = pixGetWpl(pixd);
wplf = fpixGetWpl(fpix);
if (d == 1) {
for (i = 0; i < h; i++) {
lines = datas + i * wpls;
lined = datad + i * wpld;
linef = dataf + i * wplf;
for (j = 0; j < w; j++) {
jsrc = (l_int32)(j - linef[j] + 0.5);
if (grayin < 0) /* use value at boundary if outside */
jsrc = L_MIN(L_MAX(jsrc, 0), w - 1);
if (jsrc >= 0 && jsrc < w) { /* remains gray if outside */
if (GET_DATA_BIT(lines, jsrc))
SET_DATA_BIT(lined, j);
}
}
}
} else if (d == 8) {
for (i = 0; i < h; i++) {
lines = datas + i * wpls;
lined = datad + i * wpld;
linef = dataf + i * wplf;
for (j = 0; j < w; j++) {
jsrc = (l_int32)(j - linef[j] + 0.5);
if (grayin < 0)
jsrc = L_MIN(L_MAX(jsrc, 0), w - 1);
if (jsrc >= 0 && jsrc < w) {
val8 = GET_DATA_BYTE(lines, jsrc);
SET_DATA_BYTE(lined, j, val8);
}
}
}
} else { /* d == 32 */
for (i = 0; i < h; i++) {
lines = datas + i * wpls;
lined = datad + i * wpld;
linef = dataf + i * wplf;
for (j = 0; j < w; j++) {
jsrc = (l_int32)(j - linef[j] + 0.5);
if (grayin < 0)
jsrc = L_MIN(L_MAX(jsrc, 0), w - 1);
if (jsrc >= 0 && jsrc < w)
lined[j] = lines[jsrc];
}
}
}
return pixd;
}