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alg.c
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alg.c
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/* alg.c
*
* Detect changes in a video stream.
* Copyright 2001 by Jeroen Vreeken (pe1rxq@amsat.org)
* This software is distributed under the GNU public license version 2
* See also the file 'COPYING'.
*
*/
#include "motion.h"
#include "alg.h"
#ifdef __MMX__
#define HAVE_MMX
#include "mmx.h"
#endif
#define MAX2(x, y) ((x) > (y) ? (x) : (y))
#define MAX3(x, y, z) ((x) > (y) ? ((x) > (z) ? (x) : (z)) : ((y) > (z) ? (y) : (z)))
/**
* alg_locate_center_size
* Locates the center and size of the movement.
*/
void alg_locate_center_size(struct images *imgs, int width, int height, struct coord *cent)
{
unsigned char *out = imgs->img_motion.image_norm;
int *labels = imgs->labels;
int x, y, centc = 0, xdist = 0, ydist = 0;
cent->x = 0;
cent->y = 0;
cent->maxx = 0;
cent->maxy = 0;
cent->minx = width;
cent->miny = height;
/* If Labeling enabled - locate center of largest labelgroup. */
if (imgs->labelsize_max) {
/* Locate largest labelgroup */
for (y = 0; y < height; y++) {
for (x = 0; x < width; x++) {
if (*(labels++) & 32768) {
cent->x += x;
cent->y += y;
centc++;
}
}
}
} else {
/* Locate movement */
for (y = 0; y < height; y++) {
for (x = 0; x < width; x++) {
if (*(out++)) {
cent->x += x;
cent->y += y;
centc++;
}
}
}
}
if (centc) {
cent->x = cent->x / centc;
cent->y = cent->y / centc;
}
/* Now we find the size of the Motion. */
/* First reset pointers back to initial value. */
centc = 0;
labels = imgs->labels;
out = imgs->img_motion.image_norm;
/* If Labeling then we find the area around largest labelgroup instead. */
if (imgs->labelsize_max) {
for (y = 0; y < height; y++) {
for (x = 0; x < width; x++) {
if (*(labels++) & 32768) {
if (x > cent->x)
xdist += x - cent->x;
else if (x < cent->x)
xdist += cent->x - x;
if (y > cent->y)
ydist += y - cent->y;
else if (y < cent->y)
ydist += cent->y - y;
centc++;
}
}
}
} else {
for (y = 0; y < height; y++) {
for (x = 0; x < width; x++) {
if (*(out++)) {
if (x > cent->x)
xdist += x - cent->x;
else if (x < cent->x)
xdist += cent->x - x;
if (y > cent->y)
ydist += y - cent->y;
else if (y < cent->y)
ydist += cent->y - y;
centc++;
}
}
}
}
if (centc) {
cent->minx = cent->x - xdist / centc * 2;
cent->maxx = cent->x + xdist / centc * 2;
/*
* Make the box a little bigger in y direction to make sure the
* heads fit in so we multiply by 3 instead of 2 which seems to
* to work well in practical.
*/
cent->miny = cent->y - ydist / centc * 3;
cent->maxy = cent->y + ydist / centc * 2;
}
if (cent->maxx > width - 1)
cent->maxx = width - 1;
else if (cent->maxx < 0)
cent->maxx = 0;
if (cent->maxy > height - 1)
cent->maxy = height - 1;
else if (cent->maxy < 0)
cent->maxy = 0;
if (cent->minx > width - 1)
cent->minx = width - 1;
else if (cent->minx < 0)
cent->minx = 0;
if (cent->miny > height - 1)
cent->miny = height - 1;
else if (cent->miny < 0)
cent->miny = 0;
/* Align for better locate box handling */
cent->minx += cent->minx % 2;
cent->miny += cent->miny % 2;
cent->maxx -= cent->maxx % 2;
cent->maxy -= cent->maxy % 2;
cent->width = cent->maxx - cent->minx;
cent->height = cent->maxy - cent->miny;
/*
* We want to center Y coordinate to be the center of the action.
* The head of a person is important so we correct the cent.y coordinate
* to match the correction to include a persons head that we just did above.
*/
cent->y = (cent->miny + cent->maxy) / 2;
}
/**
* alg_draw_location
* Draws a box around the movement.
*/
void alg_draw_location(struct coord *cent, struct images *imgs, int width, unsigned char *new,
int style, int mode, int process_thisframe)
{
unsigned char *out = imgs->img_motion.image_norm;
int x, y;
out = imgs->img_motion.image_norm;
/* Debug image always gets a 'normal' box. */
if ((mode == LOCATE_BOTH) && process_thisframe) {
int width_miny = width * cent->miny;
int width_maxy = width * cent->maxy;
for (x = cent->minx; x <= cent->maxx; x++) {
int width_miny_x = x + width_miny;
int width_maxy_x = x + width_maxy;
out[width_miny_x] =~out[width_miny_x];
out[width_maxy_x] =~out[width_maxy_x];
}
for (y = cent->miny; y <= cent->maxy; y++) {
int width_minx_y = cent->minx + y * width;
int width_maxx_y = cent->maxx + y * width;
out[width_minx_y] =~out[width_minx_y];
out[width_maxx_y] =~out[width_maxx_y];
}
}
if (style == LOCATE_BOX) { /* Draw a box on normal images. */
int width_miny = width * cent->miny;
int width_maxy = width * cent->maxy;
for (x = cent->minx; x <= cent->maxx; x++) {
int width_miny_x = x + width_miny;
int width_maxy_x = x + width_maxy;
new[width_miny_x] =~new[width_miny_x];
new[width_maxy_x] =~new[width_maxy_x];
}
for (y = cent->miny; y <= cent->maxy; y++) {
int width_minx_y = cent->minx + y * width;
int width_maxx_y = cent->maxx + y * width;
new[width_minx_y] =~new[width_minx_y];
new[width_maxx_y] =~new[width_maxx_y];
}
} else if (style == LOCATE_CROSS) { /* Draw a cross on normal images. */
int centy = cent->y * width;
for (x = cent->x - 10; x <= cent->x + 10; x++) {
new[centy + x] =~new[centy + x];
out[centy + x] =~out[centy + x];
}
for (y = cent->y - 10; y <= cent->y + 10; y++) {
new[cent->x + y * width] =~new[cent->x + y * width];
out[cent->x + y * width] =~out[cent->x + y * width];
}
}
}
/**
* alg_draw_red_location
* Draws a RED box around the movement.
*/
void alg_draw_red_location(struct coord *cent, struct images *imgs, int width, unsigned char *new,
int style, int mode, int process_thisframe)
{
unsigned char *out = imgs->img_motion.image_norm;
unsigned char *new_u, *new_v;
int x, y, v, cwidth, cblock;
cwidth = width / 2;
cblock = imgs->motionsize / 4;
x = imgs->motionsize;
v = x + cblock;
out = imgs->img_motion.image_norm;
new_u = new + x;
new_v = new + v;
/* Debug image always gets a 'normal' box. */
if ((mode == LOCATE_BOTH) && process_thisframe) {
int width_miny = width * cent->miny;
int width_maxy = width * cent->maxy;
for (x = cent->minx; x <= cent->maxx; x++) {
int width_miny_x = x + width_miny;
int width_maxy_x = x + width_maxy;
out[width_miny_x] =~out[width_miny_x];
out[width_maxy_x] =~out[width_maxy_x];
}
for (y = cent->miny; y <= cent->maxy; y++) {
int width_minx_y = cent->minx + y * width;
int width_maxx_y = cent->maxx + y * width;
out[width_minx_y] =~out[width_minx_y];
out[width_maxx_y] =~out[width_maxx_y];
}
}
if (style == LOCATE_REDBOX) { /* Draw a red box on normal images. */
int width_miny = width * cent->miny;
int width_maxy = width * cent->maxy;
int cwidth_miny = cwidth * (cent->miny / 2);
int cwidth_maxy = cwidth * (cent->maxy / 2);
for (x = cent->minx + 2; x <= cent->maxx - 2; x += 2) {
int width_miny_x = x + width_miny;
int width_maxy_x = x + width_maxy;
int cwidth_miny_x = x / 2 + cwidth_miny;
int cwidth_maxy_x = x / 2 + cwidth_maxy;
new_u[cwidth_miny_x] = 128;
new_u[cwidth_maxy_x] = 128;
new_v[cwidth_miny_x] = 255;
new_v[cwidth_maxy_x] = 255;
new[width_miny_x] = 128;
new[width_maxy_x] = 128;
new[width_miny_x + 1] = 128;
new[width_maxy_x + 1] = 128;
new[width_miny_x + width] = 128;
new[width_maxy_x + width] = 128;
new[width_miny_x + 1 + width] = 128;
new[width_maxy_x + 1 + width] = 128;
}
for (y = cent->miny; y <= cent->maxy; y += 2) {
int width_minx_y = cent->minx + y * width;
int width_maxx_y = cent->maxx + y * width;
int cwidth_minx_y = (cent->minx / 2) + (y / 2) * cwidth;
int cwidth_maxx_y = (cent->maxx / 2) + (y / 2) * cwidth;
new_u[cwidth_minx_y] = 128;
new_u[cwidth_maxx_y] = 128;
new_v[cwidth_minx_y] = 255;
new_v[cwidth_maxx_y] = 255;
new[width_minx_y] = 128;
new[width_maxx_y] = 128;
new[width_minx_y + width] = 128;
new[width_maxx_y + width] = 128;
new[width_minx_y + 1] = 128;
new[width_maxx_y + 1] = 128;
new[width_minx_y + width + 1] = 128;
new[width_maxx_y + width + 1] = 128;
}
} else if (style == LOCATE_REDCROSS) { /* Draw a red cross on normal images. */
int cwidth_maxy = cwidth * (cent->y / 2);
for (x = cent->x - 10; x <= cent->x + 10; x += 2) {
int cwidth_maxy_x = x / 2 + cwidth_maxy;
new_u[cwidth_maxy_x] = 128;
new_v[cwidth_maxy_x] = 255;
}
for (y = cent->y - 10; y <= cent->y + 10; y += 2) {
int cwidth_minx_y = (cent->x / 2) + (y / 2) * cwidth;
new_u[cwidth_minx_y] = 128;
new_v[cwidth_minx_y] = 255;
}
}
}
#define NORM 100
#define ABS(x) ((x) < 0 ? -(x) : (x))
#define DIFF(x, y) (ABS((x)-(y)))
#define NDIFF(x, y) (ABS(x) * NORM / (ABS(x) + 2 * DIFF(x, y)))
/**
* alg_noise_tune
*
*/
void alg_noise_tune(struct context *cnt, unsigned char *new)
{
struct images *imgs = &cnt->imgs;
int i;
unsigned char *ref = imgs->ref;
int diff, sum = 0, count = 0;
unsigned char *mask = imgs->mask;
unsigned char *smartmask = imgs->smartmask_final;
i = imgs->motionsize;
for (; i > 0; i--) {
diff = ABS(*ref - *new);
if (mask)
diff = ((diff * *mask++) / 255);
if (*smartmask) {
sum += diff + 1;
count++;
}
ref++;
new++;
smartmask++;
}
if (count > 3) /* Avoid divide by zero. */
sum /= count / 3;
/* 5: safe, 4: regular, 3: more sensitive */
cnt->noise = 4 + (cnt->noise + sum) / 2;
}
/**
* alg_threshold_tune
*
*/
void alg_threshold_tune(struct context *cnt, int diffs, int motion)
{
int i;
int sum = 0, top = diffs;
if (!diffs)
return;
if (motion)
diffs = cnt->threshold / 4;
for (i = 0; i < THRESHOLD_TUNE_LENGTH - 1; i++) {
sum += cnt->diffs_last[i];
if (cnt->diffs_last[i + 1] && !motion)
cnt->diffs_last[i] = cnt->diffs_last[i + 1];
else
cnt->diffs_last[i] = cnt->threshold / 4;
if (cnt->diffs_last[i] > top)
top = cnt->diffs_last[i];
}
sum += cnt->diffs_last[i];
cnt->diffs_last[i] = diffs;
sum /= THRESHOLD_TUNE_LENGTH / 4;
if (sum < top * 2)
sum = top * 2;
if (sum < cnt->conf.max_changes)
cnt->threshold = (cnt->threshold + sum) / 2;
}
/*
* Labeling by Joerg Weber. Based on an idea from Hubert Mara.
* Floodfill enhanced by Ian McConnel based on code from
* http://www.acm.org/pubs/tog/GraphicsGems/
* http://www.codeproject.com/gdi/QuickFill.asp
* Filled horizontal segment of scanline y for xl <= x <= xr.
* Parent segment was on line y - dy. dy = 1 or -1
*/
#define MAXS 10000 /* max depth of stack */
#define PUSH(Y, XL, XR, DY) /* push new segment on stack */ \
if (sp<stack+MAXS && Y+(DY) >= 0 && Y+(DY) < height) \
{sp->y = Y; sp->xl = XL; sp->xr = XR; sp->dy = DY; sp++;}
#define POP(Y, XL, XR, DY) /* pop segment off stack */ \
{sp--; Y = sp->y+(DY = sp->dy); XL = sp->xl; XR = sp->xr;}
typedef struct {
short y, xl, xr, dy;
} Segment;
/**
* iflood
*
*/
static int iflood(int x, int y, int width, int height,
unsigned char *out, int *labels, int newvalue, int oldvalue)
{
int l, x1, x2, dy;
Segment stack[MAXS], *sp = stack; /* Stack of filled segments. */
int count = 0;
if (x < 0 || x >= width || y < 0 || y >= height)
return 0;
PUSH(y, x, x, 1); /* Needed in some cases. */
PUSH(y+1, x, x, -1); /* Seed segment (popped 1st). */
while (sp > stack) {
/* Pop segment off stack and fill a neighboring scan line. */
POP(y, x1, x2, dy);
/*
* Segment of scan line y-dy for x1<=x<=x2 was previously filled,
* now explore adjacent pixels in scan line y
*/
for (x = x1; x >= 0 && out[y * width + x] != 0 && labels[y * width + x] == oldvalue; x--) {
labels[y * width + x] = newvalue;
count++;
}
if (x >= x1)
goto skip;
l = x + 1;
if (l < x1)
PUSH(y, l, x1 - 1, -dy); /* Leak on left? */
x = x1 + 1;
do {
for (; x < width && out[y * width + x] != 0 && labels[y * width + x] == oldvalue; x++) {
labels[y * width + x] = newvalue;
count++;
}
PUSH(y, l, x - 1, dy);
if (x > x2 + 1)
PUSH(y, x2 + 1, x - 1, -dy); /* Leak on right? */
skip:
for (x++; x <= x2 && !(out[y * width + x] != 0 && labels[y * width + x] == oldvalue); x++);
l = x;
} while (x <= x2);
}
return count;
}
/**
* alg_labeling
*
*/
static int alg_labeling(struct context *cnt)
{
struct images *imgs = &cnt->imgs;
unsigned char *out = imgs->img_motion.image_norm;
int *labels = imgs->labels;
int ix, iy, pixelpos;
int width = imgs->width;
int height = imgs->height;
int labelsize = 0;
int current_label = 2;
/* Keep track of the area just under the threshold. */
int max_under = 0;
cnt->current_image->total_labels = 0;
imgs->labelsize_max = 0;
/* ALL labels above threshold are counted as labelgroup. */
imgs->labelgroup_max = 0;
imgs->labels_above = 0;
/* Init: 0 means no label set / not checked. */
memset(labels, 0, width * height * sizeof(*labels));
pixelpos = 0;
for (iy = 0; iy < height - 1; iy++) {
for (ix = 0; ix < width - 1; ix++, pixelpos++) {
/* No motion - no label */
if (out[pixelpos] == 0) {
labels[pixelpos] = 1;
continue;
}
/* Already visited by iflood */
if (labels[pixelpos] > 0)
continue;
labelsize = iflood(ix, iy, width, height, out, labels, current_label, 0);
if (labelsize > 0) {
//MOTION_LOG(DBG, TYPE_ALL, NO_ERRNO, "Label: %i (%i) Size: %i (%i,%i)",
// current_label, cnt->current_image->total_labels,
// labelsize, ix, iy);
/* Label above threshold? Mark it again (add 32768 to labelnumber). */
if (labelsize > cnt->threshold) {
labelsize = iflood(ix, iy, width, height, out, labels, current_label + 32768, current_label);
imgs->labelgroup_max += labelsize;
imgs->labels_above++;
} else if(max_under < labelsize)
max_under = labelsize;
if (imgs->labelsize_max < labelsize) {
imgs->labelsize_max = labelsize;
imgs->largest_label = current_label;
}
cnt->current_image->total_labels++;
current_label++;
}
}
pixelpos++; /* Compensate for ix < width - 1 */
}
//MOTION_LOG(DBG, TYPE_ALL, NO_ERRNO, "%i Labels found. Largest connected Area: %i Pixel(s). "
// "Largest Label: %i", imgs->largest_label, imgs->labelsize_max,
// cnt->current_image->total_labels);
/* Return group of significant labels or if that's none, the next largest
* group (which is under the threshold, but especially for setup gives an
* idea how close it was).
*/
return imgs->labelgroup_max ? imgs->labelgroup_max : max_under;
}
/**
* dilate9
* Dilates a 3x3 box.
*/
static int dilate9(unsigned char *img, int width, int height, void *buffer)
{
/*
* - row1, row2 and row3 represent lines in the temporary buffer.
* - Window is a sliding window containing max values of the columns
* in the 3x3 matrix.
* - width is an index into the sliding window (this is faster than
* doing modulo 3 on i).
* - blob keeps the current max value.
*/
int y, i, sum = 0, widx;
unsigned char *row1, *row2, *row3, *rowTemp,*yp;
unsigned char window[3], blob, latest;
/* Set up row pointers in the temporary buffer. */
row1 = buffer;
row2 = row1 + width;
row3 = row2 + width;
/* Init rows 2 and 3. */
memset(row2, 0, width);
memcpy(row3, img, width);
/* Pointer to the current row in img. */
yp = img;
for (y = 0; y < height; y++) {
/* Move down one step; row 1 becomes the previous row 2 and so on. */
rowTemp = row1;
row1 = row2;
row2 = row3;
row3 = rowTemp;
/* If we're at the last row, fill with zeros, otherwise copy from img. */
if (y == height - 1)
memset(row3, 0, width);
else
memcpy(row3, yp+width, width);
/* Init slots 0 and 1 in the moving window. */
window[0] = MAX3(row1[0], row2[0], row3[0]);
window[1] = MAX3(row1[1], row2[1], row3[1]);
/* Init blob to the current max, and set window index. */
blob = MAX2(window[0], window[1]);
widx = 2;
/*
* Iterate over the current row; index i is off by one to eliminate
* a lot of +1es in the loop.
*/
for (i = 2; i <= width - 1; i++) {
/* Get the max value of the next column in the 3x3 matrix. */
latest = window[widx] = MAX3(row1[i], row2[i], row3[i]);
/*
* If the value is larger than the current max, use it. Otherwise,
* calculate a new max (because the new value may not be the max.
*/
if (latest >= blob)
blob = latest;
else
blob = MAX3(window[0], window[1], window[2]);
/* Write the max value (blob) to the image. */
if (blob != 0) {
*(yp + i - 1) = blob;
sum++;
}
/* Wrap around the window index if necessary. */
if (++widx == 3)
widx = 0;
}
/* Store zeros in the vertical sides. */
*yp = *(yp + width - 1) = 0;
yp += width;
}
return sum;
}
/**
* dilate5
* Dilates a + shape.
*/
static int dilate5(unsigned char *img, int width, int height, void *buffer)
{
/*
* - row1, row2 and row3 represent lines in the temporary buffer.
* - mem holds the max value of the overlapping part of two + shapes.
*/
int y, i, sum = 0;
unsigned char *row1, *row2, *row3, *rowTemp, *yp;
unsigned char blob, mem, latest;
/* Set up row pointers in the temporary buffer. */
row1 = buffer;
row2 = row1 + width;
row3 = row2 + width;
/* Init rows 2 and 3. */
memset(row2, 0, width);
memcpy(row3, img, width);
/* Pointer to the current row in img. */
yp = img;
for (y = 0; y < height; y++) {
/* Move down one step; row 1 becomes the previous row 2 and so on. */
rowTemp = row1;
row1 = row2;
row2 = row3;
row3 = rowTemp;
/* If we're at the last row, fill with zeros, otherwise copy from img. */
if (y == height - 1)
memset(row3, 0, width);
else
memcpy(row3, yp + width, width);
/* Init mem and set blob to force an evaluation of the entire + shape. */
mem = MAX2(row2[0], row2[1]);
blob = 1; /* dummy value, must be > 0 */
for (i = 1; i < width - 1; i++) {
/* Get the max value of the "right edge" of the + shape. */
latest = MAX3(row1[i], row2[i + 1], row3[i]);
if (blob == 0) {
/* In case the last blob is zero, only latest matters. */
blob = latest;
mem = row2[i + 1];
} else {
/* Otherwise, we have to check both latest and mem. */
blob = MAX2(mem, latest);
mem = MAX2(row2[i], row2[i + 1]);
}
/* Write the max value (blob) to the image. */
if (blob != 0) {
*(yp + i) = blob;
sum++;
}
}
/* Store zeros in the vertical sides. */
*yp = *(yp + width - 1) = 0;
yp += width;
}
return sum;
}
/**
* erode9
* Erodes a 3x3 box.
*/
static int erode9(unsigned char *img, int width, int height, void *buffer, unsigned char flag)
{
int y, i, sum = 0;
char *Row1,*Row2,*Row3;
Row1 = buffer;
Row2 = Row1 + width;
Row3 = Row1 + 2 * width;
memset(Row2, flag, width);
memcpy(Row3, img, width);
for (y = 0; y < height; y++) {
memcpy(Row1, Row2, width);
memcpy(Row2, Row3, width);
if (y == height-1)
memset(Row3, flag, width);
else
memcpy(Row3, img + (y+1) * width, width);
for (i = width - 2; i >= 1; i--) {
if (Row1[i - 1] == 0 ||
Row1[i] == 0 ||
Row1[i + 1] == 0 ||
Row2[i - 1] == 0 ||
Row2[i] == 0 ||
Row2[i + 1] == 0 ||
Row3[i - 1] == 0 ||
Row3[i] == 0 ||
Row3[i + 1] == 0)
img[y * width + i] = 0;
else
sum++;
}
img[y * width] = img[y * width + width - 1] = flag;
}
return sum;
}
/**
* erode5
* Erodes in a + shape.
*/
static int erode5(unsigned char *img, int width, int height, void *buffer, unsigned char flag)
{
int y, i, sum = 0;
char *Row1,*Row2,*Row3;
Row1 = buffer;
Row2 = Row1 + width;
Row3 = Row1 + 2 * width;
memset(Row2, flag, width);
memcpy(Row3, img, width);
for (y = 0; y < height; y++) {
memcpy(Row1, Row2, width);
memcpy(Row2, Row3, width);
if (y == height-1)
memset(Row3, flag, width);
else
memcpy(Row3, img + (y + 1) * width, width);
for (i = width - 2; i >= 1; i--) {
if (Row1[i] == 0 ||
Row2[i - 1] == 0 ||
Row2[i] == 0 ||
Row2[i + 1] == 0 ||
Row3[i] == 0)
img[y * width + i] = 0;
else
sum++;
}
img[y * width] = img[y * width + width - 1] = flag;
}
return sum;
}
/**
* alg_despeckle
* Despeckling routine to remove noisy detections.
*/
int alg_despeckle(struct context *cnt, int olddiffs)
{
int diffs = 0;
unsigned char *out = cnt->imgs.img_motion.image_norm;
int width = cnt->imgs.width;
int height = cnt->imgs.height;
int done = 0, i, len = strlen(cnt->conf.despeckle_filter);
unsigned char *common_buffer = cnt->imgs.common_buffer;
for (i = 0; i < len; i++) {
switch (cnt->conf.despeckle_filter[i]) {
case 'E':
if ((diffs = erode9(out, width, height, common_buffer, 0)) == 0)
i = len;
done = 1;
break;
case 'e':
if ((diffs = erode5(out, width, height, common_buffer, 0)) == 0)
i = len;
done = 1;
break;
case 'D':
diffs = dilate9(out, width, height, common_buffer);
done = 1;
break;
case 'd':
diffs = dilate5(out, width, height, common_buffer);
done = 1;
break;
/* No further despeckle after labeling! */
case 'l':
diffs = alg_labeling(cnt);
i = len;
done = 2;
break;
}
}
/* If conf.despeckle_filter contains any valid action EeDdl */
if (done) {
if (done != 2)
cnt->imgs.labelsize_max = 0; // Disable Labeling
return diffs;
} else {
cnt->imgs.labelsize_max = 0; // Disable Labeling
}
return olddiffs;
}
/**
* alg_tune_smartmask
* Generates actual smartmask. Calculate sensitivity based on motion.
*/
void alg_tune_smartmask(struct context *cnt)
{
int i, diff;
int motionsize = cnt->imgs.motionsize;
unsigned char *smartmask = cnt->imgs.smartmask;
unsigned char *smartmask_final = cnt->imgs.smartmask_final;
int *smartmask_buffer = cnt->imgs.smartmask_buffer;
int sensitivity = cnt->lastrate * (11 - cnt->smartmask_speed);
for (i = 0; i < motionsize; i++) {
/* Decrease smart_mask sensitivity every 5*speed seconds only. */
if (smartmask[i] > 0)
smartmask[i]--;
/* Increase smart_mask sensitivity based on the buffered values. */
diff = smartmask_buffer[i]/sensitivity;
if (diff) {
if (smartmask[i] <= diff + 80)
smartmask[i] += diff;
else
smartmask[i] = 80;
smartmask_buffer[i] %= sensitivity;
}
/* Transfer raw mask to the final stage when above trigger value. */
if (smartmask[i] > 20)
smartmask_final[i] = 0;
else
smartmask_final[i] = 255;
}
/* Further expansion (here:erode due to inverted logic!) of the mask. */
diff = erode9(smartmask_final, cnt->imgs.width, cnt->imgs.height,
cnt->imgs.common_buffer, 255);
diff = erode5(smartmask_final, cnt->imgs.width, cnt->imgs.height,
cnt->imgs.common_buffer, 255);
}
/* Increment for *smartmask_buffer in alg_diff_standard. */
#define SMARTMASK_SENSITIVITY_INCR 5
/**
* alg_diff_standard
*
*/
int alg_diff_standard(struct context *cnt, unsigned char *new)
{
struct images *imgs = &cnt->imgs;
int i, diffs = 0;
int noise = cnt->noise;
int smartmask_speed = cnt->smartmask_speed;
unsigned char *ref = imgs->ref;
unsigned char *out = imgs->img_motion.image_norm;
unsigned char *mask = imgs->mask;
unsigned char *smartmask_final = imgs->smartmask_final;
int *smartmask_buffer = imgs->smartmask_buffer;
#ifdef HAVE_MMX
mmx_t mmtemp; /* Used for transferring to/from memory. */
int unload; /* Counter for unloading diff counts. */
#endif
i = imgs->motionsize;
memset(out + i, 128, i / 2); /* Motion pictures are now b/w i.o. green */
/*
* Keeping this memset in the MMX case when zeroes are necessarily
* written anyway seems to be beneficial in terms of speed. Perhaps a
* cache thing?
*/
memset(out, 0, i);
#ifdef HAVE_MMX
/*
* NOTE: The Pentium has two instruction pipes: U and V. I have grouped MMX
* instructions in pairs according to how I think they will be scheduled in
* the U and V pipes. Due to pairing constraints, the V pipe will sometimes
* be empty (for example, memory access always goes into the U pipe).
*
* The following MMX registers are kept throughout the loop:
* mm5 - 8 separate diff counters (unloaded periodically)
* mm6 - mask: 00ff 00ff 00ff 00ff
* mm7 - noise level as 8 packed bytes
*
* -- Per Jonsson
*/
/*
* To avoid a div, we work with differences multiplied by 255 in the
* default case and *mask otherwise. Thus, the limit to compare with is
* 255 * (noise + 1) - 1).
*/
mmtemp.uw[0] = mmtemp.uw[1] = mmtemp.uw[2] = mmtemp.uw[3] =
(unsigned short)(noise * 255 + 254);
/*
* Reset mm5 to zero, set the mm6 mask, and store the multiplied noise
* level as four words in mm7.
*/
movq_m2r(mmtemp, mm7); /* U */
pcmpeqb_r2r(mm6, mm6); /* V */
pxor_r2r(mm5, mm5); /* U */
psrlw_i2r(8, mm6); /* V */
/*
* We must unload mm5 every 255th round, because the diffs accumulate
* in each packed byte, which can hold at most 255 diffs before it
* gets saturated.
*/
unload = 255;
for (; i > 7; i -= 8) {