cvwimage.h
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上传日期:2022-07-03
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波变换
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Visual C++
- ///////////////////////////////////////////////////////////////////////////////
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- //
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- // License Agreement
- // For Open Source Computer Vision Library
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- // this list of conditions and the following disclaimer.
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- // (including, but not limited to, procurement of substitute goods or services;
- // loss of use, data, or profits; or business interruption) however caused
- // and on any theory of liability, whether in contract, strict liability,
- // or tort (including negligence or otherwise) arising in any way out of
- // the use of this software, even if advised of the possibility of such damage.
- /////////////////////////////////////////////////////////////////////////////////
- //
- // Image class which provides a thin layer around an IplImage. The goals
- // of the class design are:
- // 1. All the data has explicit ownership to avoid memory leaks
- // 2. No hidden allocations or copies for performance.
- // 3. Easy access to OpenCV methods (which will access IPP if available)
- // 4. Can easily treat external data as an image
- // 5. Easy to create images which are subsets of other images
- // 6. Fast pixel access which can take advantage of number of channels
- // if known at compile time.
- //
- // The WImage class is the image class which provides the data accessors.
- // The 'W' comes from the fact that it is also a wrapper around the popular
- // but inconvenient IplImage class. A WImage can be constructed either using a
- // WImageBuffer class which allocates and frees the data,
- // or using a WImageView class which constructs a subimage or a view into
- // external data. The view class does no memory management. Each class
- // actually has two versions, one when the number of channels is known at
- // compile time and one when it isn't. Using the one with the number of
- // channels specified can provide some compile time optimizations by using the
- // fact that the number of channels is a constant.
- //
- // We use the convention (c,r) to refer to column c and row r with (0,0) being
- // the upper left corner. This is similar to standard Euclidean coordinates
- // with the first coordinate varying in the horizontal direction and the second
- // coordinate varying in the vertical direction.
- // Thus (c,r) is usually in the domain [0, width) X [0, height)
- //
- // Example usage:
- // WImageBuffer3_b im(5,7); // Make a 5X7 3 channel image of type uchar
- // WImageView3_b sub_im(im, 2,2, 3,3); // 3X3 submatrix
- // vector<float> vec(10, 3.0f);
- // WImageView1_f user_im(&vec[0], 2, 5); // 2X5 image w/ supplied data
- //
- // im.SetZero(); // same as cvSetZero(im.Ipl())
- // *im(2, 3) = 15; // Modify the element at column 2, row 3
- // MySetRand(&sub_im);
- //
- // // Copy the second row into the first. This can be done with no memory
- // // allocation and will use SSE if IPP is available.
- // int w = im.Width();
- // im.View(0,0, w,1).CopyFrom(im.View(0,1, w,1));
- //
- // // Doesn't care about source of data since using WImage
- // void MySetRand(WImage_b* im) { // Works with any number of channels
- // for (int r = 0; r < im->Height(); ++r) {
- // float* row = im->Row(r);
- // for (int c = 0; c < im->Width(); ++c) {
- // for (int ch = 0; ch < im->Channels(); ++ch, ++row) {
- // *row = uchar(rand() & 255);
- // }
- // }
- // }
- // }
- //
- // Functions that are not part of the basic image allocation, viewing, and
- // access should come from OpenCV, except some useful functions that are not
- // part of OpenCV can be found in wimage_util.h
- #ifndef _CV_WIMAGE_H_
- #define _CV_WIMAGE_H_
- #include "cxcore.h"
- #ifdef __cplusplus
- namespace cv {
- template <typename T> class WImage;
- template <typename T> class WImageBuffer;
- template <typename T> class WImageView;
- template<typename T, int C> class WImageC;
- template<typename T, int C> class WImageBufferC;
- template<typename T, int C> class WImageViewC;
- // Commonly used typedefs.
- typedef WImage<uchar> WImage_b;
- typedef WImageView<uchar> WImageView_b;
- typedef WImageBuffer<uchar> WImageBuffer_b;
- typedef WImageC<uchar, 1> WImage1_b;
- typedef WImageViewC<uchar, 1> WImageView1_b;
- typedef WImageBufferC<uchar, 1> WImageBuffer1_b;
- typedef WImageC<uchar, 3> WImage3_b;
- typedef WImageViewC<uchar, 3> WImageView3_b;
- typedef WImageBufferC<uchar, 3> WImageBuffer3_b;
- typedef WImage<float> WImage_f;
- typedef WImageView<float> WImageView_f;
- typedef WImageBuffer<float> WImageBuffer_f;
- typedef WImageC<float, 1> WImage1_f;
- typedef WImageViewC<float, 1> WImageView1_f;
- typedef WImageBufferC<float, 1> WImageBuffer1_f;
- typedef WImageC<float, 3> WImage3_f;
- typedef WImageViewC<float, 3> WImageView3_f;
- typedef WImageBufferC<float, 3> WImageBuffer3_f;
- // There isn't a standard for signed and unsigned short so be more
- // explicit in the typename for these cases.
- typedef WImage<short> WImage_16s;
- typedef WImageView<short> WImageView_16s;
- typedef WImageBuffer<short> WImageBuffer_16s;
- typedef WImageC<short, 1> WImage1_16s;
- typedef WImageViewC<short, 1> WImageView1_16s;
- typedef WImageBufferC<short, 1> WImageBuffer1_16s;
- typedef WImageC<short, 3> WImage3_16s;
- typedef WImageViewC<short, 3> WImageView3_16s;
- typedef WImageBufferC<short, 3> WImageBuffer3_16s;
- typedef WImage<ushort> WImage_16u;
- typedef WImageView<ushort> WImageView_16u;
- typedef WImageBuffer<ushort> WImageBuffer_16u;
- typedef WImageC<ushort, 1> WImage1_16u;
- typedef WImageViewC<ushort, 1> WImageView1_16u;
- typedef WImageBufferC<ushort, 1> WImageBuffer1_16u;
- typedef WImageC<ushort, 3> WImage3_16u;
- typedef WImageViewC<ushort, 3> WImageView3_16u;
- typedef WImageBufferC<ushort, 3> WImageBuffer3_16u;
- //
- // WImage definitions
- //
- // This WImage class gives access to the data it refers to. It can be
- // constructed either by allocating the data with a WImageBuffer class or
- // using the WImageView class to refer to a subimage or outside data.
- template<typename T>
- class WImage
- {
- public:
- typedef T BaseType;
- // WImage is an abstract class with no other virtual methods so make the
- // destructor virtual.
- virtual ~WImage() = 0;
- // Accessors
- IplImage* Ipl() {return image_; }
- const IplImage* Ipl() const {return image_; }
- T* ImageData() { return reinterpret_cast<T*>(image_->imageData); }
- const T* ImageData() const {
- return reinterpret_cast<const T*>(image_->imageData);
- }
- int Width() const {return image_->width; }
- int Height() const {return image_->height; }
- // WidthStep is the number of bytes to go to the pixel with the next y coord
- int WidthStep() const {return image_->widthStep; }
- int Channels() const {return image_->nChannels; }
- int ChannelSize() const {return sizeof(T); } // number of bytes per channel
- // Number of bytes per pixel
- int PixelSize() const {return Channels() * ChannelSize(); }
- // Return depth type (e.g. IPL_DEPTH_8U, IPL_DEPTH_32F) which is the number
- // of bits per channel and with the signed bit set.
- // This is known at compile time using specializations.
- int Depth() const;
- inline const T* Row(int r) const {
- return reinterpret_cast<T*>(image_->imageData + r*image_->widthStep);
- }
- inline T* Row(int r) {
- return reinterpret_cast<T*>(image_->imageData + r*image_->widthStep);
- }
- // Pixel accessors which returns a pointer to the start of the channel
- inline T* operator() (int c, int r) {
- return reinterpret_cast<T*>(image_->imageData + r*image_->widthStep) +
- c*Channels();
- }
- inline const T* operator() (int c, int r) const {
- return reinterpret_cast<T*>(image_->imageData + r*image_->widthStep) +
- c*Channels();
- }
- // Copy the contents from another image which is just a convenience to cvCopy
- void CopyFrom(const WImage<T>& src) { cvCopy(src.Ipl(), image_); }
- // Set contents to zero which is just a convenient to cvSetZero
- void SetZero() { cvSetZero(image_); }
- // Construct a view into a region of this image
- WImageView<T> View(int c, int r, int width, int height);
- protected:
- // Disallow copy and assignment
- WImage(const WImage&);
- void operator=(const WImage&);
- explicit WImage(IplImage* img) : image_(img) {
- assert(!img || img->depth == Depth());
- }
- void SetIpl(IplImage* image) {
- assert(!image || image->depth == Depth());
- image_ = image;
- }
- IplImage* image_;
- };
- // Image class when both the pixel type and number of channels
- // are known at compile time. This wrapper will speed up some of the operations
- // like accessing individual pixels using the () operator.
- template<typename T, int C>
- class WImageC : public WImage<T>
- {
- public:
- typedef typename WImage<T>::BaseType BaseType;
- enum { kChannels = C };
- explicit WImageC(IplImage* img) : WImage<T>(img) {
- assert(!img || img->nChannels == Channels());
- }
- // Construct a view into a region of this image
- WImageViewC<T, C> View(int c, int r, int width, int height);
- // Copy the contents from another image which is just a convenience to cvCopy
- void CopyFrom(const WImageC<T, C>& src) {
- cvCopy(src.Ipl(), WImage<T>::image_);
- }
- // WImageC is an abstract class with no other virtual methods so make the
- // destructor virtual.
- virtual ~WImageC() = 0;
- int Channels() const {return C; }
- protected:
- // Disallow copy and assignment
- WImageC(const WImageC&);
- void operator=(const WImageC&);
- void SetIpl(IplImage* image) {
- assert(!image || image->depth == WImage<T>::Depth());
- WImage<T>::SetIpl(image);
- }
- };
- //
- // WImageBuffer definitions
- //
- // Image class which owns the data, so it can be allocated and is always
- // freed. It cannot be copied but can be explicity cloned.
- //
- template<typename T>
- class WImageBuffer : public WImage<T>
- {
- public:
- typedef typename WImage<T>::BaseType BaseType;
- // Default constructor which creates an object that can be
- WImageBuffer() : WImage<T>(0) {}
- WImageBuffer(int width, int height, int nchannels) : WImage<T>(0) {
- Allocate(width, height, nchannels);
- }
- // Constructor which takes ownership of a given IplImage so releases
- // the image on destruction.
- explicit WImageBuffer(IplImage* img) : WImage<T>(img) {}
- // Allocate an image. Does nothing if current size is the same as
- // the new size.
- void Allocate(int width, int height, int nchannels);
- // Set the data to point to an image, releasing the old data
- void SetIpl(IplImage* img) {
- ReleaseImage();
- WImage<T>::SetIpl(img);
- }
- // Clone an image which reallocates the image if of a different dimension.
- void CloneFrom(const WImage<T>& src) {
- Allocate(src.Width(), src.Height(), src.Channels());
- CopyFrom(src);
- }
- ~WImageBuffer() {
- ReleaseImage();
- }
- // Release the image if it isn't null.
- void ReleaseImage() {
- if (WImage<T>::image_) {
- IplImage* image = WImage<T>::image_;
- cvReleaseImage(&image);
- WImage<T>::SetIpl(0);
- }
- }
- bool IsNull() const {return WImage<T>::image_ == NULL; }
- private:
- // Disallow copy and assignment
- WImageBuffer(const WImageBuffer&);
- void operator=(const WImageBuffer&);
- };
- // Like a WImageBuffer class but when the number of channels is known
- // at compile time.
- template<typename T, int C>
- class WImageBufferC : public WImageC<T, C>
- {
- public:
- typedef typename WImage<T>::BaseType BaseType;
- enum { kChannels = C };
- // Default constructor which creates an object that can be
- WImageBufferC() : WImageC<T, C>(0) {}
- WImageBufferC(int width, int height) : WImageC<T, C>(0) {
- Allocate(width, height);
- }
- // Constructor which takes ownership of a given IplImage so releases
- // the image on destruction.
- explicit WImageBufferC(IplImage* img) : WImageC<T, C>(img) {}
- // Allocate an image. Does nothing if current size is the same as
- // the new size.
- void Allocate(int width, int height);
- // Set the data to point to an image, releasing the old data
- void SetIpl(IplImage* img) {
- ReleaseImage();
- WImageC<T, C>::SetIpl(img);
- }
- // Clone an image which reallocates the image if of a different dimension.
- void CloneFrom(const WImageC<T, C>& src) {
- Allocate(src.Width(), src.Height());
- CopyFrom(src);
- }
- ~WImageBufferC() {
- ReleaseImage();
- }
- // Release the image if it isn't null.
- void ReleaseImage() {
- if (WImage<T>::image_) {
- IplImage* image = WImage<T>::image_;
- cvReleaseImage(&image);
- WImageC<T, C>::SetIpl(0);
- }
- }
- bool IsNull() const {return WImage<T>::image_ == NULL; }
- private:
- // Disallow copy and assignment
- WImageBufferC(const WImageBufferC&);
- void operator=(const WImageBufferC&);
- };
- //
- // WImageView definitions
- //
- // View into an image class which allows treating a subimage as an image
- // or treating external data as an image
- //
- template<typename T>
- class WImageView : public WImage<T>
- {
- public:
- typedef typename WImage<T>::BaseType BaseType;
- // Construct a subimage. No checks are done that the subimage lies
- // completely inside the original image.
- WImageView(WImage<T>* img, int c, int r, int width, int height);
- // Refer to external data.
- // If not given width_step assumed to be same as width.
- WImageView(T* data, int width, int height, int channels, int width_step = -1);
- // Refer to external data. This does NOT take ownership
- // of the supplied IplImage.
- WImageView(IplImage* img) : WImage<T>(img) {}
- // Copy constructor
- WImageView(const WImage<T>& img) : WImage<T>(0) {
- header_ = *(img.Ipl());
- WImage<T>::SetIpl(&header_);
- }
- WImageView& operator=(const WImage<T>& img) {
- header_ = *(img.Ipl());
- WImage<T>::SetIpl(&header_);
- return *this;
- }
- protected:
- IplImage header_;
- };
- template<typename T, int C>
- class WImageViewC : public WImageC<T, C>
- {
- public:
- typedef typename WImage<T>::BaseType BaseType;
- enum { kChannels = C };
- // Default constructor needed for vectors of views.
- WImageViewC();
- virtual ~WImageViewC() {}
- // Construct a subimage. No checks are done that the subimage lies
- // completely inside the original image.
- WImageViewC(WImageC<T, C>* img,
- int c, int r, int width, int height);
- // Refer to external data
- WImageViewC(T* data, int width, int height, int width_step = -1);
- // Refer to external data. This does NOT take ownership
- // of the supplied IplImage.
- WImageViewC(IplImage* img) : WImageC<T, C>(img) {}
- // Copy constructor which does a shallow copy to allow multiple views
- // of same data. gcc-4.1.1 gets confused if both versions of
- // the constructor and assignment operator are not provided.
- WImageViewC(const WImageC<T, C>& img) : WImageC<T, C>(0) {
- header_ = *(img.Ipl());
- WImageC<T, C>::SetIpl(&header_);
- }
- WImageViewC(const WImageViewC<T, C>& img) : WImageC<T, C>(0) {
- header_ = *(img.Ipl());
- WImageC<T, C>::SetIpl(&header_);
- }
- WImageViewC& operator=(const WImageC<T, C>& img) {
- header_ = *(img.Ipl());
- WImageC<T, C>::SetIpl(&header_);
- return *this;
- }
- WImageViewC& operator=(const WImageViewC<T, C>& img) {
- header_ = *(img.Ipl());
- WImageC<T, C>::SetIpl(&header_);
- return *this;
- }
- protected:
- IplImage header_;
- };
- // Specializations for depth
- template<>
- inline int WImage<uchar>::Depth() const {return IPL_DEPTH_8U; }
- template<>
- inline int WImage<signed char>::Depth() const {return IPL_DEPTH_8S; }
- template<>
- inline int WImage<short>::Depth() const {return IPL_DEPTH_16S; }
- template<>
- inline int WImage<ushort>::Depth() const {return IPL_DEPTH_16U; }
- template<>
- inline int WImage<int>::Depth() const {return IPL_DEPTH_32S; }
- template<>
- inline int WImage<float>::Depth() const {return IPL_DEPTH_32F; }
- template<>
- inline int WImage<double>::Depth() const {return IPL_DEPTH_64F; }
- //
- // Pure virtual destructors still need to be defined.
- //
- template<typename T> inline WImage<T>::~WImage() {}
- template<typename T, int C> inline WImageC<T, C>::~WImageC() {}
- //
- // Allocate ImageData
- //
- template<typename T>
- inline void WImageBuffer<T>::Allocate(int width, int height, int nchannels)
- {
- if (IsNull() || WImage<T>::Width() != width ||
- WImage<T>::Height() != height || WImage<T>::Channels() != nchannels) {
- ReleaseImage();
- WImage<T>::image_ = cvCreateImage(cvSize(width, height),
- WImage<T>::Depth(), nchannels);
- }
- }
- template<typename T, int C>
- inline void WImageBufferC<T, C>::Allocate(int width, int height)
- {
- if (IsNull() || WImage<T>::Width() != width || WImage<T>::Height() != height) {
- ReleaseImage();
- WImageC<T, C>::SetIpl(cvCreateImage(cvSize(width, height),WImage<T>::Depth(), C));
- }
- }
- //
- // ImageView methods
- //
- template<typename T>
- WImageView<T>::WImageView(WImage<T>* img, int c, int r, int width, int height)
- : WImage<T>(0)
- {
- header_ = *(img->Ipl());
- header_.imageData = reinterpret_cast<char*>((*img)(c, r));
- header_.width = width;
- header_.height = height;
- WImage<T>::SetIpl(&header_);
- }
- template<typename T>
- WImageView<T>::WImageView(T* data, int width, int height, int nchannels, int width_step)
- : WImage<T>(0)
- {
- cvInitImageHeader(&header_, cvSize(width, height), WImage<T>::Depth(), nchannels);
- header_.imageData = reinterpret_cast<char*>(data);
- if (width_step > 0) {
- header_.widthStep = width_step;
- }
- WImage<T>::SetIpl(&header_);
- }
- template<typename T, int C>
- WImageViewC<T, C>::WImageViewC(WImageC<T, C>* img, int c, int r, int width, int height)
- : WImageC<T, C>(0)
- {
- header_ = *(img->Ipl());
- header_.imageData = reinterpret_cast<char*>((*img)(c, r));
- header_.width = width;
- header_.height = height;
- WImageC<T, C>::SetIpl(&header_);
- }
- template<typename T, int C>
- WImageViewC<T, C>::WImageViewC() : WImageC<T, C>(0) {
- cvInitImageHeader(&header_, cvSize(0, 0), WImage<T>::Depth(), C);
- header_.imageData = reinterpret_cast<char*>(0);
- WImageC<T, C>::SetIpl(&header_);
- }
- template<typename T, int C>
- WImageViewC<T, C>::WImageViewC(T* data, int width, int height, int width_step)
- : WImageC<T, C>(0)
- {
- cvInitImageHeader(&header_, cvSize(width, height), WImage<T>::Depth(), C);
- header_.imageData = reinterpret_cast<char*>(data);
- if (width_step > 0) {
- header_.widthStep = width_step;
- }
- WImageC<T, C>::SetIpl(&header_);
- }
- // Construct a view into a region of an image
- template<typename T>
- WImageView<T> WImage<T>::View(int c, int r, int width, int height) {
- return WImageView<T>(this, c, r, width, height);
- }
- template<typename T, int C>
- WImageViewC<T, C> WImageC<T, C>::View(int c, int r, int width, int height) {
- return WImageViewC<T, C>(this, c, r, width, height);
- }
- } // end of namespace
- #endif // __cplusplus
- #endif // _CV_WIMAGE_H_