ccv.js
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var ccv = {
pre : function (image) {
if (image.tagName.toLowerCase() == "img") {
var canvas = document.createElement("canvas");
document.body.appendChild(image);
canvas.width = image.offsetWidth;
canvas.style.width = image.offsetWidth.toString() + "px";
canvas.height = image.offsetHeight;
canvas.style.height = image.offsetHeight.toString() + "px";
document.body.removeChild(image);
var ctx = canvas.getContext("2d");
ctx.drawImage(image, 0, 0);
return canvas;
}
return image;
},
grayscale : function (canvas) {
var ctx = canvas.getContext("2d");
var imageData = ctx.getImageData(0, 0, canvas.width, canvas.height);
var data = imageData.data;
var pix1, pix2, pix = canvas.width * canvas.height * 4;
while (pix > 0)
data[pix -= 4] = data[pix1 = pix + 1] = data[pix2 = pix + 2] = (data[pix] * 0.3 + data[pix1] * 0.59 + data[pix2] * 0.11);
ctx.putImageData(imageData, 0, 0);
return canvas;
},
__get_named_arguments : function (params, names) {
if (params.length > 1) {
var new_params = {};
for (var i = 0; i < names.length; i++)
new_params[names[i]] = params[i];
return new_params;
}
return params[0];
},
__worker_scripts : {},
spawn : function (pre, script, params, post, complete, worker_num) {
var params = ccv.__get_named_arguments(arguments, ["pre", "script", "params", "post", "complete", "worker_num"]);
var worker = new Worker("ccv.js");
worker.onmessage = function (event) {
params.complete(params.post((typeof event.data == "string") ? JSON.parse(event.data) : event.data));
};
var msg = { "data" : params.pre(),
"script" : params.script,
"params" : params.params,
"id" : 0,
"worker_num" : params.worker_num };
try {
worker.postMessage(msg);
} catch (e) {
worker.postMessage(JSON.stringify(msg));
}
return worker;
},
array_group : function (seq, gfunc) {
var i, j;
var node = new Array(seq.length);
for (i = 0; i < seq.length; i++)
node[i] = {"parent" : -1,
"element" : seq[i],
"rank" : 0};
for (i = 0; i < seq.length; i++)
{
if (!node[i].element)
continue;
var root = i;
while (node[root].parent != -1)
root = node[root].parent;
for (j = 0; j < seq.length; j++)
{
if( i != j && node[j].element && gfunc(node[i].element, node[j].element))
{
var root2 = j;
while (node[root2].parent != -1)
root2 = node[root2].parent;
if(root2 != root)
{
if(node[root].rank > node[root2].rank)
node[root2].parent = root;
else
{
node[root].parent = root2;
if (node[root].rank == node[root2].rank)
node[root2].rank++;
root = root2;
}
/* compress path from node2 to the root: */
var temp, node2 = j;
while (node[node2].parent != -1)
{
temp = node2;
node2 = node[node2].parent;
node[temp].parent = root;
}
/* compress path from node to the root: */
node2 = i;
while (node[node2].parent != -1)
{
temp = node2;
node2 = node[node2].parent;
node[temp].parent = root;
}
}
}
}
}
var idx = new Array(seq.length);
var class_idx = 0;
for(i = 0; i < seq.length; i++)
{
j = -1;
var node1 = i;
if(node[node1].element)
{
while (node[node1].parent != -1)
node1 = node[node1].parent;
if(node[node1].rank >= 0)
node[node1].rank = ~class_idx++;
j = ~node[node1].rank;
}
idx[i] = j;
}
return {"index" : idx, "cat" : class_idx};
},
detect_objects : function (canvas, cascade, interval, min_neighbors, complete, worker_num, setup) {
var params = ccv.__get_named_arguments(arguments, ["canvas", "cascade", "interval", "min_neighbors", "complete", "worker_num", "setup"]);
if (!params.setup) {
var cascade = params.cascade;
var scale = Math.pow(2, 1 / (params.interval + 1));
var next = params.interval + 1;
var scale_upto = Math.floor(Math.log(Math.min(params.canvas.width / cascade.width, params.canvas.height / cascade.height)) / Math.log(scale));
}
var pre = function () {
var pyr = new Array((scale_upto + next * 2) * 4);
var ret = new Array((scale_upto + next * 2) * 4);
pyr[0] = params.canvas;
ret[0] = { "width" : pyr[0].width,
"height" : pyr[0].height,
"data" : pyr[0].getContext("2d").getImageData(0, 0, pyr[0].width, pyr[0].height).data };
var i;
for (i = 1; i <= params.interval; i++) {
pyr[i * 4] = document.createElement("canvas");
pyr[i * 4].width = Math.floor(pyr[0].width / Math.pow(scale, i));
pyr[i * 4].height = Math.floor(pyr[0].height / Math.pow(scale, i));
pyr[i * 4].getContext("2d").drawImage(pyr[0], 0, 0, pyr[0].width, pyr[0].height, 0, 0, pyr[i * 4].width, pyr[i * 4].height);
ret[i * 4] = { "width" : pyr[i * 4].width,
"height" : pyr[i * 4].height,
"data" : pyr[i * 4].getContext("2d").getImageData(0, 0, pyr[i * 4].width, pyr[i * 4].height).data };
}
for (i = next; i < scale_upto + next * 2; i++) {
pyr[i * 4] = document.createElement("canvas");
pyr[i * 4].width = Math.floor(pyr[i * 4 - next * 4].width / 2);
pyr[i * 4].height = Math.floor(pyr[i * 4 - next * 4].height / 2);
pyr[i * 4].getContext("2d").drawImage(pyr[i * 4 - next * 4], 0, 0, pyr[i * 4 - next * 4].width, pyr[i * 4 - next * 4].height, 0, 0, pyr[i * 4].width, pyr[i * 4].height);
ret[i * 4] = { "width" : pyr[i * 4].width,
"height" : pyr[i * 4].height,
"data" : pyr[i * 4].getContext("2d").getImageData(0, 0, pyr[i * 4].width, pyr[i * 4].height).data };
}
for (i = next * 2; i < scale_upto + next * 2; i++) {
pyr[i * 4 + 1] = document.createElement("canvas");
pyr[i * 4 + 1].width = Math.floor(pyr[i * 4 - next * 4].width / 2);
pyr[i * 4 + 1].height = Math.floor(pyr[i * 4 - next * 4].height / 2);
pyr[i * 4 + 1].getContext("2d").drawImage(pyr[i * 4 - next * 4], 1, 0, pyr[i * 4 - next * 4].width - 1, pyr[i * 4 - next * 4].height, 0, 0, pyr[i * 4 + 1].width - 2, pyr[i * 4 + 1].height);
ret[i * 4 + 1] = { "width" : pyr[i * 4 + 1].width,
"height" : pyr[i * 4 + 1].height,
"data" : pyr[i * 4 + 1].getContext("2d").getImageData(0, 0, pyr[i * 4 + 1].width, pyr[i * 4 + 1].height).data };
pyr[i * 4 + 2] = document.createElement("canvas");
pyr[i * 4 + 2].width = Math.floor(pyr[i * 4 - next * 4].width / 2);
pyr[i * 4 + 2].height = Math.floor(pyr[i * 4 - next * 4].height / 2);
pyr[i * 4 + 2].getContext("2d").drawImage(pyr[i * 4 - next * 4], 0, 1, pyr[i * 4 - next * 4].width, pyr[i * 4 - next * 4].height - 1, 0, 0, pyr[i * 4 + 2].width, pyr[i * 4 + 2].height - 2);
ret[i * 4 + 2] = { "width" : pyr[i * 4 + 2].width,
"height" : pyr[i * 4 + 2].height,
"data" : pyr[i * 4 + 2].getContext("2d").getImageData(0, 0, pyr[i * 4 + 2].width, pyr[i * 4 + 2].height).data };
pyr[i * 4 + 3] = document.createElement("canvas");
pyr[i * 4 + 3].width = Math.floor(pyr[i * 4 - next * 4].width / 2);
pyr[i * 4 + 3].height = Math.floor(pyr[i * 4 - next * 4].height / 2);
pyr[i * 4 + 3].getContext("2d").drawImage(pyr[i * 4 - next * 4], 1, 1, pyr[i * 4 - next * 4].width - 1, pyr[i * 4 - next * 4].height - 1, 0, 0, pyr[i * 4 + 3].width - 2, pyr[i * 4 + 3].height - 2);
ret[i * 4 + 3] = { "width" : pyr[i * 4 + 3].width,
"height" : pyr[i * 4 + 3].height,
"data" : pyr[i * 4 + 3].getContext("2d").getImageData(0, 0, pyr[i * 4 + 3].width, pyr[i * 4 + 3].height).data };
}
for (i = 0; i < cascade.stage_classifier.length; i++)
cascade.stage_classifier[i].orig_feature = cascade.stage_classifier[i].feature;
return ret;
};
var work = function (pyr, params, id, worker_num) {
var cascade = params.cascade;
var scale = Math.pow(2, 1 / (params.interval + 1));
var next = params.interval + 1;
var scale_upto = Math.floor(Math.log(Math.min(pyr[0].width / cascade.width, pyr[0].height / cascade.height)) / Math.log(scale));
var i, j, k, x, y, q;
var scale_x = 1, scale_y = 1;
var dx = [0, 1, 0, 1];
var dy = [0, 0, 1, 1];
var seq = [];
for (i = 0; i < scale_upto; i++) {
var qw = pyr[i * 4 + next * 8].width - Math.floor(cascade.width / 4);
var qh = pyr[i * 4 + next * 8].height - Math.floor(cascade.height / 4);
var step = [pyr[i * 4].width * 4, pyr[i * 4 + next * 4].width * 4, pyr[i * 4 + next * 8].width * 4];
var paddings = [pyr[i * 4].width * 16 - qw * 16,
pyr[i * 4 + next * 4].width * 8 - qw * 8,
pyr[i * 4 + next * 8].width * 4 - qw * 4];
for (j = 0; j < cascade.stage_classifier.length; j++) {
var orig_feature = cascade.stage_classifier[j].orig_feature;
var feature = cascade.stage_classifier[j].feature = new Array(cascade.stage_classifier[j].count);
for (k = 0; k < cascade.stage_classifier[j].count; k++) {
feature[k] = {"size" : orig_feature[k].size,
"px" : new Array(orig_feature[k].size),
"pz" : new Array(orig_feature[k].size),
"nx" : new Array(orig_feature[k].size),
"nz" : new Array(orig_feature[k].size)};
for (q = 0; q < orig_feature[k].size; q++) {
feature[k].px[q] = orig_feature[k].px[q] * 4 + orig_feature[k].py[q] * step[orig_feature[k].pz[q]];
feature[k].pz[q] = orig_feature[k].pz[q];
feature[k].nx[q] = orig_feature[k].nx[q] * 4 + orig_feature[k].ny[q] * step[orig_feature[k].nz[q]];
feature[k].nz[q] = orig_feature[k].nz[q];
}
}
}
for (q = 0; q < 4; q++) {
var u8 = [pyr[i * 4].data, pyr[i * 4 + next * 4].data, pyr[i * 4 + next * 8 + q].data];
var u8o = [dx[q] * 8 + dy[q] * pyr[i * 4].width * 8, dx[q] * 4 + dy[q] * pyr[i * 4 + next * 4].width * 4, 0];
for (y = 0; y < qh; y++) {
for (x = 0; x < qw; x++) {
var sum = 0;
var flag = true;
for (j = 0; j < cascade.stage_classifier.length; j++) {
sum = 0;
var alpha = cascade.stage_classifier[j].alpha;
var feature = cascade.stage_classifier[j].feature;
for (k = 0; k < cascade.stage_classifier[j].count; k++) {
var feature_k = feature[k];
var p, pmin = u8[feature_k.pz[0]][u8o[feature_k.pz[0]] + feature_k.px[0]];
var n, nmax = u8[feature_k.nz[0]][u8o[feature_k.nz[0]] + feature_k.nx[0]];
if (pmin <= nmax) {
sum += alpha[k * 2];
} else {
var f, shortcut = true;
for (f = 0; f < feature_k.size; f++) {
if (feature_k.pz[f] >= 0) {
p = u8[feature_k.pz[f]][u8o[feature_k.pz[f]] + feature_k.px[f]];
if (p < pmin) {
if (p <= nmax) {
shortcut = false;
break;
}
pmin = p;
}
}
if (feature_k.nz[f] >= 0) {
n = u8[feature_k.nz[f]][u8o[feature_k.nz[f]] + feature_k.nx[f]];
if (n > nmax) {
if (pmin <= n) {
shortcut = false;
break;
}
nmax = n;
}
}
}
sum += (shortcut) ? alpha[k * 2 + 1] : alpha[k * 2];
}
}
if (sum < cascade.stage_classifier[j].threshold) {
flag = false;
break;
}
}
if (flag) {
seq.push({"x" : (x * 4 + dx[q] * 2) * scale_x,
"y" : (y * 4 + dy[q] * 2) * scale_y,
"width" : cascade.width * scale_x,
"height" : cascade.height * scale_y,
"neighbor" : 1,
"confidence" : sum});
}
u8o[0] += 16;
u8o[1] += 8;
u8o[2] += 4;
}
u8o[0] += paddings[0];
u8o[1] += paddings[1];
u8o[2] += paddings[2];
}
}
scale_x *= scale;
scale_y *= scale;
}
return seq;
};
var post = function (seq) {
var i, j;
for (i = 0; i < cascade.stage_classifier.length; i++)
cascade.stage_classifier[i].feature = cascade.stage_classifier[i].orig_feature;
if (!(params.min_neighbors > 0))
return seq;
else {
var result = ccv.array_group(seq, function (r1, r2) {
var distance = Math.floor(r1.width * 0.25 + 0.5);
return r2.x <= r1.x + distance &&
r2.x >= r1.x - distance &&
r2.y <= r1.y + distance &&
r2.y >= r1.y - distance &&
r2.width <= Math.floor(r1.width * 1.5 + 0.5) &&
Math.floor(r2.width * 1.5 + 0.5) >= r1.width;
});
var ncomp = result.cat;
var idx_seq = result.index;
var comps = new Array(ncomp + 1);
for (i = 0; i < comps.length; i++)
comps[i] = {"neighbors" : 0,
"x" : 0,
"y" : 0,
"width" : 0,
"height" : 0,
"confidence" : 0};
// count number of neighbors
for(i = 0; i < seq.length; i++)
{
var r1 = seq[i];
var idx = idx_seq[i];
if (comps[idx].neighbors == 0)
comps[idx].confidence = r1.confidence;
++comps[idx].neighbors;
comps[idx].x += r1.x;
comps[idx].y += r1.y;
comps[idx].width += r1.width;
comps[idx].height += r1.height;
comps[idx].confidence = Math.max(comps[idx].confidence, r1.confidence);
}
var seq2 = [];
// calculate average bounding box
for(i = 0; i < ncomp; i++)
{
var n = comps[i].neighbors;
if (n >= params.min_neighbors)
seq2.push({"x" : (comps[i].x * 2 + n) / (2 * n),
"y" : (comps[i].y * 2 + n) / (2 * n),
"width" : (comps[i].width * 2 + n) / (2 * n),
"height" : (comps[i].height * 2 + n) / (2 * n),
"neighbors" : comps[i].neighbors,
"confidence" : comps[i].confidence});
}
var result_seq = [];
// filter out small face rectangles inside large face rectangles
for(i = 0; i < seq2.length; i++)
{
var r1 = seq2[i];
var flag = true;
for(j = 0; j < seq2.length; j++)
{
var r2 = seq2[j];
var distance = Math.floor(r2.width * 0.25 + 0.5);
if(i != j &&
r1.x >= r2.x - distance &&
r1.y >= r2.y - distance &&
r1.x + r1.width <= r2.x + r2.width + distance &&
r1.y + r1.height <= r2.y + r2.height + distance &&
(r2.neighbors > Math.max(3, r1.neighbors) || r1.neighbors < 3))
{
flag = false;
break;
}
}
if(flag)
result_seq.push(r1);
}
return result_seq;
}
};
if (params.setup) {
ccv.__worker_scripts.detect_objects = work;
} else {
if (params.complete === undefined) {
return post(work(pre(), params, 0, 1));
} else {
ccv.spawn(pre, "detect_objects", { "cascade" : params.cascade,
"interval" : params.interval,
"min_neighbors" : params.min_neighbors }, post, params.complete, params.worker_num);
}
}
}
}
onmessage = function (event) {
var data = (typeof event.data == "string") ? JSON.parse(event.data) : event.data;
ccv[data.script]({"setup" : true});
var result = ccv.__worker_scripts[data.script](data.data, data.params, data.id, data.worker_num);
try {
postMessage(result);
} catch (e) {
postMessage(JSON.stringify(result));
}
}