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improved CV_RGBHSV_FULL accuracy (ticket #938)

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This commit is contained in:
Vadim Pisarevsky
2011-06-02 12:10:18 +00:00
parent da9e3ed6fb
commit 1a0b1d2aea
2 changed files with 63 additions and 62 deletions
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67
modules/imgproc/src/color.cpp
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@@ -787,50 +787,37 @@ struct RGB2HSV_b
typedef uchar channel_type;
RGB2HSV_b(int _srccn, int _blueIdx, int _hrange)
: srccn(_srccn), blueIdx(_blueIdx), hrange(_hrange) {}
: srccn(_srccn), blueIdx(_blueIdx), hrange(_hrange)
{
CV_Assert( hrange == 180 || hrange == 256 );
}
void operator()(const uchar* src, uchar* dst, int n) const
{
int i, bidx = blueIdx, scn = srccn;
const int hsv_shift = 12;
static const int div_table[] = {
0, 1044480, 522240, 348160, 261120, 208896, 174080, 149211,
130560, 116053, 104448, 94953, 87040, 80345, 74606, 69632,
65280, 61440, 58027, 54973, 52224, 49737, 47476, 45412,
43520, 41779, 40172, 38684, 37303, 36017, 34816, 33693,
32640, 31651, 30720, 29842, 29013, 28229, 27486, 26782,
26112, 25475, 24869, 24290, 23738, 23211, 22706, 22223,
21760, 21316, 20890, 20480, 20086, 19707, 19342, 18991,
18651, 18324, 18008, 17703, 17408, 17123, 16846, 16579,
16320, 16069, 15825, 15589, 15360, 15137, 14921, 14711,
14507, 14308, 14115, 13926, 13743, 13565, 13391, 13221,
13056, 12895, 12738, 12584, 12434, 12288, 12145, 12006,
11869, 11736, 11605, 11478, 11353, 11231, 11111, 10995,
10880, 10768, 10658, 10550, 10445, 10341, 10240, 10141,
10043, 9947, 9854, 9761, 9671, 9582, 9495, 9410,
9326, 9243, 9162, 9082, 9004, 8927, 8852, 8777,
8704, 8632, 8561, 8492, 8423, 8356, 8290, 8224,
8160, 8097, 8034, 7973, 7913, 7853, 7795, 7737,
7680, 7624, 7569, 7514, 7461, 7408, 7355, 7304,
7253, 7203, 7154, 7105, 7057, 7010, 6963, 6917,
6872, 6827, 6782, 6739, 6695, 6653, 6611, 6569,
6528, 6487, 6447, 6408, 6369, 6330, 6292, 6254,
6217, 6180, 6144, 6108, 6073, 6037, 6003, 5968,
5935, 5901, 5868, 5835, 5803, 5771, 5739, 5708,
5677, 5646, 5615, 5585, 5556, 5526, 5497, 5468,
5440, 5412, 5384, 5356, 5329, 5302, 5275, 5249,
5222, 5196, 5171, 5145, 5120, 5095, 5070, 5046,
5022, 4998, 4974, 4950, 4927, 4904, 4881, 4858,
4836, 4813, 4791, 4769, 4748, 4726, 4705, 4684,
4663, 4642, 4622, 4601, 4581, 4561, 4541, 4522,
4502, 4483, 4464, 4445, 4426, 4407, 4389, 4370,
4352, 4334, 4316, 4298, 4281, 4263, 4246, 4229,
4212, 4195, 4178, 4161, 4145, 4128, 4112, 4096
};
int hr = hrange, hscale = hr == 180 ? 15 : 21;
static int sdiv_table[256];
static int hdiv_table180[256];
static int hdiv_table256[256];
static volatile bool initialized = false;
int hr = hrange;
const int* hdiv_table = hr == 180 ? hdiv_table180 : hdiv_table256;
n *= 3;
if( !initialized )
{
sdiv_table[0] = hdiv_table180[0] = hdiv_table256[0] = 0;
for( i = 1; i < 256; i++ )
{
sdiv_table[i] = saturate_cast<int>((255 << hsv_shift)/(1.*i));
hdiv_table180[i] = saturate_cast<int>((180 << hsv_shift)/(6.*i));
hdiv_table256[i] = saturate_cast<int>((256 << hsv_shift)/(6.*i));
}
initialized = true;
}
for( i = 0; i < n; i += 3, src += scn )
{
int b = src[bidx], g = src[1], r = src[bidx^2];
@@ -847,13 +834,13 @@ struct RGB2HSV_b
vr = v == r ? -1 : 0;
vg = v == g ? -1 : 0;
s = diff * div_table[v] >> hsv_shift;
s = (diff * sdiv_table[v] + (1 << (hsv_shift-1))) >> hsv_shift;
h = (vr & (g - b)) +
(~vr & ((vg & (b - r + 2 * diff)) + ((~vg) & (r - g + 4 * diff))));
h = (h * div_table[diff] * hscale + (1 << (hsv_shift + 6))) >> (7 + hsv_shift);
h = (h * hdiv_table[diff] + (1 << (hsv_shift-1))) >> hsv_shift;
h += h < 0 ? hr : 0;
dst[i] = (uchar)h;
dst[i] = saturate_cast<uchar>(h);
dst[i+1] = (uchar)s;
dst[i+2] = (uchar)v;
}
@@ -2808,7 +2795,7 @@ void cv::cvtColor( const InputArray& _src, OutputArray _dst, int code, int dcn )
bidx = code == CV_BGR2HSV || code == CV_BGR2HLS ||
code == CV_BGR2HSV_FULL || code == CV_BGR2HLS_FULL ? 0 : 2;
int hrange = depth == CV_32F ? 360 : code == CV_BGR2HSV || code == CV_RGB2HSV ||
code == CV_BGR2HLS || code == CV_RGB2HLS ? 180 : 255;
code == CV_BGR2HLS || code == CV_RGB2HLS ? 180 : 256;
_dst.create(sz, CV_MAKETYPE(depth, 3));
dst = _dst.getMat();