generic-library/opencv
1
0
Fork 0
Code Issues Pull Requests Releases Wiki Activity

Fix read after the end of local buffer in SSE-optimized TYPE_5_8 and TYPE_7_12 FAST cornerScore

Browse Source
This commit is contained in:
Andrey Kamaev 2012-10-10 02:31:44 +04:00
parent 56b27bcc7e
commit a9f36dfcfe
2 changed files with 40 additions and 43 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

81
modules/features2d/src/fast_score.cpp
View File

@ -43,42 +43,42 @@ The references are:
#include "fast_score.hpp"
namespace cv
{
#define VERIFY_CORNERS 0
void makeOffsets(int pixel[25], int rowStride, int patternSize)
void cv::makeOffsets(int pixel[25], int rowStride, int patternSize)
{
static const int offsets16[][2] =
{
{0, 3}, { 1, 3}, { 2, 2}, { 3, 1}, { 3, 0}, { 3, -1}, { 2, -2}, { 1, -3},
{0, -3}, {-1, -3}, {-2, -2}, {-3, -1}, {-3, 0}, {-3, 1}, {-2, 2}, {-1, 3}
};
static const int offsets12[][2] =
{
{0, 2}, { 1, 2}, { 2, 1}, { 2, 0}, { 2, -1}, { 1, -2},
{0, -2}, {-1, -2}, {-2, -1}, {-2, 0}, {-2, 1}, {-1, 2}
};
static const int offsets8[][2] =
{
{0, 1}, { 1, 1}, { 1, 0}, { 1, -1},
{0, 1}, { 1, 1}, { 1, 0}, { 1, -1},
{0, -1}, {-1, -1}, {-1, 0}, {-1, 1}
};
const int (*offsets)[2] = patternSize == 16 ? offsets16 :
patternSize == 12 ? offsets12 : patternSize == 8 ? offsets8 : 0;
CV_Assert(pixel != 0 && offsets);
patternSize == 12 ? offsets12 :
patternSize == 8 ? offsets8 : 0;
CV_Assert(pixel && offsets);
int k = 0;
for( ; k < patternSize; k++ )
pixel[k] = offsets[k][0] + offsets[k][1]*rowStride;
pixel[k] = offsets[k][0] + offsets[k][1] * rowStride;
for( ; k < 25; k++ )
pixel[k] = pixel[k - patternSize];
}
#if 0
#if VERIFY_CORNERS
static void testCorner(const uchar* ptr, const int pixel[], int K, int N, int threshold) {
// check that with the computed "threshold" the pixel is still a corner
// and that with the increased-by-1 "threshold" the pixel is not a corner anymore
@ -115,7 +115,7 @@ static void testCorner(const uchar* ptr, const int pixel[], int K, int N, int th
#endif
template<>
int cornerScore<16>(const uchar* ptr, const int pixel[], int threshold)
int cv::cornerScore<16>(const uchar* ptr, const int pixel[], int threshold)
{
const int K = 8, N = K*3 + 1;
int k, v = ptr[0];
@ -198,20 +198,24 @@ int cornerScore<16>(const uchar* ptr, const int pixel[], int threshold)
threshold = -b0-1;
#endif
#if 0
#if VERIFY_CORNERS
testCorner(ptr, pixel, K, N, threshold);
#endif
return threshold;
}
template<>
int cornerScore<12>(const uchar* ptr, const int pixel[], int threshold)
int cv::cornerScore<12>(const uchar* ptr, const int pixel[], int threshold)
{
const int K = 6, N = K*3 + 1;
int k, v = ptr[0];
short d[N];
short d[N + 4];
for( k = 0; k < N; k++ )
d[k] = (short)(v - ptr[pixel[k]]);
#if CV_SSE2
for( k = 0; k < 4; k++ )
d[N+k] = d[k];
#endif
#if CV_SSE2
__m128i q0 = _mm_set1_epi16(-1000), q1 = _mm_set1_epi16(1000);
@ -278,14 +282,14 @@ int cornerScore<12>(const uchar* ptr, const int pixel[], int threshold)
threshold = -b0-1;
#endif
#if 0
#if VERIFY_CORNERS
testCorner(ptr, pixel, K, N, threshold);
#endif
return threshold;
}
template<>
int cornerScore<8>(const uchar* ptr, const int pixel[], int threshold)
int cv::cornerScore<8>(const uchar* ptr, const int pixel[], int threshold)
{
const int K = 4, N = K*3 + 1;
int k, v = ptr[0];
@ -294,26 +298,22 @@ int cornerScore<8>(const uchar* ptr, const int pixel[], int threshold)
d[k] = (short)(v - ptr[pixel[k]]);
#if CV_SSE2
__m128i q0 = _mm_set1_epi16(-1000), q1 = _mm_set1_epi16(1000);
for( k = 0; k < 16; k += 8 )
{
__m128i v0 = _mm_loadu_si128((__m128i*)(d+k+1));
__m128i v1 = _mm_loadu_si128((__m128i*)(d+k+2));
__m128i a = _mm_min_epi16(v0, v1);
__m128i b = _mm_max_epi16(v0, v1);
v0 = _mm_loadu_si128((__m128i*)(d+k+3));
a = _mm_min_epi16(a, v0);
b = _mm_max_epi16(b, v0);
v0 = _mm_loadu_si128((__m128i*)(d+k+4));
a = _mm_min_epi16(a, v0);
b = _mm_max_epi16(b, v0);
v0 = _mm_loadu_si128((__m128i*)(d+k));
q0 = _mm_max_epi16(q0, _mm_min_epi16(a, v0));
q1 = _mm_min_epi16(q1, _mm_max_epi16(b, v0));
v0 = _mm_loadu_si128((__m128i*)(d+k+5));
q0 = _mm_max_epi16(q0, _mm_min_epi16(a, v0));
q1 = _mm_min_epi16(q1, _mm_max_epi16(b, v0));
}
__m128i v0 = _mm_loadu_si128((__m128i*)(d+1));
__m128i v1 = _mm_loadu_si128((__m128i*)(d+2));
__m128i a = _mm_min_epi16(v0, v1);
__m128i b = _mm_max_epi16(v0, v1);
v0 = _mm_loadu_si128((__m128i*)(d+3));
a = _mm_min_epi16(a, v0);
b = _mm_max_epi16(b, v0);
v0 = _mm_loadu_si128((__m128i*)(d+4));
a = _mm_min_epi16(a, v0);
b = _mm_max_epi16(b, v0);
v0 = _mm_loadu_si128((__m128i*)(d));
__m128i q0 = _mm_min_epi16(a, v0);
__m128i q1 = _mm_max_epi16(b, v0);
v0 = _mm_loadu_si128((__m128i*)(d+5));
q0 = _mm_max_epi16(q0, _mm_min_epi16(a, v0));
q1 = _mm_min_epi16(q1, _mm_max_epi16(b, v0));
q0 = _mm_max_epi16(q0, _mm_sub_epi16(_mm_setzero_si128(), q1));
q0 = _mm_max_epi16(q0, _mm_unpackhi_epi64(q0, q0));
q0 = _mm_max_epi16(q0, _mm_srli_si128(q0, 4));
@ -348,10 +348,9 @@ int cornerScore<8>(const uchar* ptr, const int pixel[], int threshold)
threshold = -b0-1;
#endif
#if 0
#if VERIFY_CORNERS
testCorner(ptr, pixel, K, N, threshold);
#endif
return threshold;
}
}

2
modules/features2d/src/fast_score.hpp
View File

@ -53,8 +53,6 @@ namespace cv
void makeOffsets(int pixel[25], int row_stride, int patternSize);
//static void testCorner(const uchar* ptr, const int pixel[], int K, int N, int threshold);
template<int patternSize>
int cornerScore(const uchar* ptr, const int pixel[], int threshold);