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钟尚武
dlib
Commits
5e7d14f4
Commit
5e7d14f4
authored
Sep 09, 2011
by
Davis King
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Plain Diff
simplified this object a little bit.
parent
02566cc9
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2 changed files
with
19 additions
and
30 deletions
+19
-30
hashed_feature_image.h
dlib/image_keypoint/hashed_feature_image.h
+8
-6
hashed_feature_image_abstract.h
dlib/image_keypoint/hashed_feature_image_abstract.h
+11
-24
No files found.
dlib/image_keypoint/hashed_feature_image.h
View file @
5e7d14f4
...
@@ -58,8 +58,6 @@ namespace dlib
...
@@ -58,8 +58,6 @@ namespace dlib
const
image_type
&
img
const
image_type
&
img
);
);
bool
has_image_statistics
(
)
const
;
void
copy_configuration
(
void
copy_configuration
(
const
feature_extractor
&
item
const
feature_extractor
&
item
...
@@ -132,6 +130,8 @@ namespace dlib
...
@@ -132,6 +130,8 @@ namespace dlib
private
:
private
:
inline
bool
has_image_statistics
(
)
const
;
feature_extractor
fe
;
feature_extractor
fe
;
typename
feature_extractor
::
descriptor_type
inv_stddev
;
typename
feature_extractor
::
descriptor_type
inv_stddev
;
...
@@ -431,11 +431,9 @@ namespace dlib
...
@@ -431,11 +431,9 @@ namespace dlib
{
{
// make sure requires clause is not broken
// make sure requires clause is not broken
DLIB_ASSERT
(
0
<=
row
&&
row
<
nr
()
&&
DLIB_ASSERT
(
0
<=
row
&&
row
<
nr
()
&&
0
<=
col
&&
col
<
nc
()
&&
0
<=
col
&&
col
<
nc
(),
has_image_statistics
()
==
true
,
"
\t
descriptor_type hashed_feature_image::operator(row,col)"
"
\t
descriptor_type hashed_feature_image::operator(row,col)"
<<
"
\n\t
Invalid inputs were given to this function"
<<
"
\n\t
Invalid inputs were given to this function"
<<
"
\n\t
has_image_statistics(): "
<<
has_image_statistics
()
<<
"
\n\t
row: "
<<
row
<<
"
\n\t
row: "
<<
row
<<
"
\n\t
col: "
<<
col
<<
"
\n\t
col: "
<<
col
<<
"
\n\t
nr(): "
<<
nr
()
<<
"
\n\t
nr(): "
<<
nr
()
...
@@ -444,7 +442,11 @@ namespace dlib
...
@@ -444,7 +442,11 @@ namespace dlib
);
);
hash_feats
.
resize
(
scales
.
size
());
hash_feats
.
resize
(
scales
.
size
());
scaled_feats
=
pointwise_multiply
(
fe
(
row
,
col
),
inv_stddev
);
if
(
has_image_statistics
())
scaled_feats
=
pointwise_multiply
(
fe
(
row
,
col
),
inv_stddev
);
else
scaled_feats
=
fe
(
row
,
col
);
for
(
long
i
=
0
;
i
<
scales
.
size
();
++
i
)
for
(
long
i
=
0
;
i
<
scales
.
size
();
++
i
)
{
{
quantized_feats
=
matrix_cast
<
int32
>
(
scales
(
i
)
*
scaled_feats
);
quantized_feats
=
matrix_cast
<
int32
>
(
scales
(
i
)
*
scaled_feats
);
...
...
dlib/image_keypoint/hashed_feature_image_abstract.h
View file @
5e7d14f4
...
@@ -24,7 +24,6 @@ namespace dlib
...
@@ -24,7 +24,6 @@ namespace dlib
INITIAL VALUE
INITIAL VALUE
- size() == 0
- size() == 0
- get_num_dimensions() == 1000
- get_num_dimensions() == 1000
- has_image_statistics() == false
- get_scales() == logspace(-1,1,3)
- get_scales() == logspace(-1,1,3)
WHAT THIS OBJECT REPRESENTS
WHAT THIS OBJECT REPRESENTS
...
@@ -77,10 +76,10 @@ namespace dlib
...
@@ -77,10 +76,10 @@ namespace dlib
ensures
ensures
- When a feature vector from BASE_FE is hashed, it is hashed into exactly
- When a feature vector from BASE_FE is hashed, it is hashed into exactly
get_scales().size() hash bins. Each hash is computed as follows:
get_scales().size() hash bins. Each hash is computed as follows:
-
first normalize the feature vector
-
First normalize the feature vector.
-
then multiply it by an element of get_scales()
-
Then multiply it by an element of get_scales().
-
then convert the resulting vector to a vector of dlib::int32
-
Then convert the resulting vector to a vector of dlib::int32.
-
f
inally, hash the integer vector into a hash bin.
-
F
inally, hash the integer vector into a hash bin.
- The size of the numbers in get_scales() determines how "big" the hash bins are.
- The size of the numbers in get_scales() determines how "big" the hash bins are.
A very small scale value would result in all input vectors being hashed into the
A very small scale value would result in all input vectors being hashed into the
same bin, while larger scale values would result in only similar vectors
same bin, while larger scale values would result in only similar vectors
...
@@ -97,22 +96,12 @@ namespace dlib
...
@@ -97,22 +96,12 @@ namespace dlib
);
);
/*!
/*!
requires
requires
- image_type == is an implementation of array2d/array2d_kernel_abstract.h
- image_type == any type that can be supplied to feature_extractor::load()
- pixel_traits<typename image_type::type>::has_alpha == false
ensures
ensures
- if (img is large enough to have at least two local features in it) then
- Part of the hashing step is to normalize the features produced by BASE_FE.
- #has_image_statistics() == true
This function will accumulate image statistics used to perform this normalization.
- This function will accumulate image statistics across multiple calls.
Note that it will accumulate across multiple calls. Therefore, it can be
Therefore, it can be beneficial to pass in many images.
beneficial to pass in many images.
!*/
bool
has_image_statistics
(
)
const
;
/*!
ensures
- Part of the hashing step is to normalize the features produced by
BASE_FE. This function returns true if we have accumulated the necessary
information to perform this normalization and false otherwise.
!*/
!*/
void
copy_configuration
(
void
copy_configuration
(
...
@@ -145,8 +134,7 @@ namespace dlib
...
@@ -145,8 +134,7 @@ namespace dlib
);
);
/*!
/*!
requires
requires
- image_type == is an implementation of array2d/array2d_kernel_abstract.h
- image_type == any type that can be supplied to feature_extractor::load()
- pixel_traits<typename image_type::type>::has_alpha == false
ensures
ensures
- performs BASE_FE.load(img)
- performs BASE_FE.load(img)
i.e. does feature extraction. The features can be accessed using
i.e. does feature extraction. The features can be accessed using
...
@@ -198,11 +186,10 @@ namespace dlib
...
@@ -198,11 +186,10 @@ namespace dlib
)
const
;
)
const
;
/*!
/*!
requires
requires
- has_image_statistics() == true
- 0 <= row < nr()
- 0 <= row < nr()
- 0 <= col < nc()
- 0 <= col < nc()
ensures
ensures
- hashes BASE_FE(row,col) and returns resulting indicator vector.
- hashes BASE_FE(row,col) and returns
the
resulting indicator vector.
- Returns a vector V such that:
- Returns a vector V such that:
- V.size() == get_scales().size()
- V.size() == get_scales().size()
- for all valid i: 0 <= V[i].first < get_num_dimensions()
- for all valid i: 0 <= V[i].first < get_num_dimensions()
...
...
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