Public Member Functions | |
| DcmQuantColorHashTable () | |
| constructor | |
| ~DcmQuantColorHashTable () | |
| destructor | |
| void | add (const DcmQuantPixel &colorP, int value) |
| adds a new color to the hash table. | |
| int | lookup (const DcmQuantPixel &colorP) const |
| looks up the given color in the hash table. | |
| unsigned long | addToHashTable (DicomImage &image, unsigned long newmaxval, unsigned long maxcolors) |
| adds all pixels of all frames of the given image (which must be a color image) to the hash table. | |
| unsigned long | countEntries () const |
| counts the number of entries in the hash table | |
| unsigned long | createHistogram (DcmQuantHistogramItemPointer *&array) |
| converts the contents of this hash table into a histogram array. | |
Private Member Functions | |
| DcmQuantColorHashTable (const DcmQuantColorHashTable &src) | |
| private undefined copy constructor | |
| DcmQuantColorHashTable & | operator= (const DcmQuantColorHashTable &src) |
| private undefined copy assignment operator | |
Private Attributes | |
| DcmQuantHistogramItemListPointer * | table |
| hash array of lists for color/value pairs | |
Each entry of the hash table consists of an RGB color (DcmQuantPixel object) and an integer value (e. g. counter). This class is used during the quantization of a color image.
Definition at line 47 of file diqthash.h.
| void DcmQuantColorHashTable::add | ( | const DcmQuantPixel & | colorP, | |
| int | value | |||
| ) | [inline] |
adds a new color to the hash table.
The color must not yet be present (the caller is responsible for checking this).
| colorP | color to be added to table | |
| value | integer value (counter) associated to color |
Definition at line 61 of file diqthash.h.
References DcmQuantPixel::hash(), DcmQuantHistogramItemList::push_front(), and table.
Referenced by DcmQuantColorMapping< T1, T2 >::create().
| int DcmQuantColorHashTable::lookup | ( | const DcmQuantPixel & | colorP | ) | const [inline] |
looks up the given color in the hash table.
If found, the value associated to the color is returned, -1 otherwise.
| colorP | color to look up in hash table |
Definition at line 71 of file diqthash.h.
References DcmQuantPixel::hash(), DcmQuantHistogramItemList::lookup(), and table.
Referenced by DcmQuantColorMapping< T1, T2 >::create().
| unsigned long DcmQuantColorHashTable::addToHashTable | ( | DicomImage & | image, | |
| unsigned long | newmaxval, | |||
| unsigned long | maxcolors | |||
| ) |
adds all pixels of all frames of the given image (which must be a color image) to the hash table.
The counter (integer value associated to each color) counts the occurence of the color in the image. If more than maxcolors colors are found, the function returns zero.
| image | image in which colors are to be counted | |
| newmaxval | maximum pixel value to which the contents of the image are scaled down (see documentation of class DcmQuantScaleTable) before counting colors. This is used by the caller to reduce the number of colors in the image if necessary. | |
| maxcolors | maximum number of colors allowed. If more colors are found, the method immediately returns with a return value of zero. |
| unsigned long DcmQuantColorHashTable::countEntries | ( | ) | const |
counts the number of entries in the hash table
| unsigned long DcmQuantColorHashTable::createHistogram | ( | DcmQuantHistogramItemPointer *& | array | ) |
converts the contents of this hash table into a histogram array.
After a successful call to addToHashTable(), this object contains an image histogram stored in a hash table. This method creates a new array of DcmQuantHistogramItem pointers on the heap and moves the contents of the hash table into this array.
| array | the hash table array is returned in this parameter |