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Embedded Zerotree Image Codec with Bior97 SSE Optimized Wavelet-transform

, 20 Oct 2007
This article demonstrates the use of Embedded zero tree still image codec with JPEG 2000 wavelet-filter.
ezw_demo.zip
bin
ezwconsole.exe
ezw_demo_update_1_.zip
ezwconsole.exe
ezw_src.zip
src
Lib
Release
ezw_src_update_1_.zip
// ezwconsole.cpp : Defines the entry point for the console application.
//

#include "stdafx.h"
#include "ezwconsole.h"

#include "lib\codecy.h"

#ifdef _DEBUG
#define new DEBUG_NEW
#endif


// The one and only application object
CWinApp theApp;

using namespace std;

//global data
CodecY gCodec;

void compress(int argc, TCHAR* argv[]);
void decompress(int argc, TCHAR* argv[]);
void help();

int get_encoder_clsid(const WCHAR* format, CLSID* pClsid);
void change_extension(wchar_t* path, const wchar_t* ext);


int _tmain(int argc, TCHAR* argv[], TCHAR* envp[])
{
	int nRetCode = 0;

        Gdiplus::GdiplusStartupInput gdiplusStartupInput;
        ULONG_PTR gdiplusToken;
        GdiplusStartup(&gdiplusToken, &gdiplusStartupInput, NULL);

	// initialize MFC and print and error on failure
	if (!AfxWinInit(::GetModuleHandle(NULL), NULL, ::GetCommandLine(), 0))
	{
		// TODO: change error code to suit your needs
		_tprintf(_T("Fatal Error: MFC initialization failed\n"));
		nRetCode = 1;
	}
	else
	{
		// TODO: code your application's behavior here.
                if (argc == 1+3 && wcscmp(argv[1], L"c") == 0)
                        compress(argc, argv);
                else if (argc == 1+2 && wcscmp(argv[1], L"d") == 0)
                        decompress(argc, argv);
                else
                        help();

	}

        Gdiplus::GdiplusShutdown(gdiplusToken);

	return nRetCode;
}

void help()
{
        wprintf(L"ezwconsole c image_file quality(0-100) - to compress the image\n"  
                L"ezwconsole d compressed_file.ezw - to decompress it to ezw.bmp and open it in image viewer\n");
}

void compress(int argc, TCHAR* argv[])
{
        Gdiplus::Bitmap image(argv[2]);
        if (image.GetLastStatus() == Gdiplus::Ok) {
                wprintf(L"opened %s %dx%d\n", argv[2], image.GetWidth(), image.GetHeight());

                unsigned int width = (image.GetWidth() % 8) ? image.GetWidth() - (image.GetWidth() % 8) : image.GetWidth();
                unsigned int height = (image.GetHeight() % 8) ? image.GetHeight() - (image.GetHeight() % 8) : image.GetHeight();

                Gdiplus::BitmapData bData;
                Gdiplus::Status s = image.LockBits(&Gdiplus::Rect(0, 0, width, height), Gdiplus::ImageLockModeRead, 
                                                                    PixelFormat24bppRGB, &bData);
                if (s == Gdiplus::Ok) {

                        unsigned char* gray = new unsigned char[width * height];
                        unsigned char* pgray = gray;

                        //rgb2gray
                        unsigned char* Pixels = (unsigned char *)bData.Scan0;     //BGR triplet
                        for(unsigned int y = 0; y < height; y++) {
                                for(unsigned int x = 0; x < width; x++) {
                                        *pgray++ = (unsigned char)(0.2989f * float(Pixels[3*x+2]) + 
                                                    0.5870f * float(Pixels[3*x+1]) +  
                                                    0.1140f * float(Pixels[3*x]));
                                }                        
                                Pixels += bData.Stride;
                        }
                        image.UnlockBits(&bData);

                        //compress gray
                        unsigned int size = 0;
                        unsigned int quality = _wtoi(argv[3]);
                        if (quality > 100) quality = 100;

                        quality = (unsigned int)(100.0f/log(100.0f) * log(float(quality)));     //put quality to log scale

                        gCodec.initgray(width, height);                        
                        unsigned char* frame = gCodec.compressgray(gray, size, 100 - quality);                        

                        if (frame != 0) {
                                wchar_t name[_MAX_PATH];
                                wcscpy(name, argv[2]);
                                change_extension(name, L".ezw");
                                FILE* fp = _wfopen(name, L"wb");
                                if (fp != 0)
                                        wprintf(L" compressed %s to %.2f Kb. 1:%.2f compression\n", argv[2],
                                                (float)fwrite(frame, 1, size, fp) / 1000.0f, float(width * height) / float(size));
                                else
                                        wprintf(L"failed to open %s for writing.\n", name);
                                fclose(fp);
                        }
                        else
                                wprintf(L"failed to compress image.\n");

                        delete[] gray;                        
                }
                else {
                        wprintf(L"failed to lock %s for data reading. err %d", argv[2], s);
                        return;
                }
        }
        else {
                wprintf(L"failed to open %s. err: %d", argv[2], image.GetLastStatus());
                return;
        }                
}

void decompress(int argc, TCHAR* argv[])
{
        FILE* fp = _wfopen(argv[2], L"rb");
        if (fp != 0) {
                fseek(fp, 0, SEEK_END);
                long size = ftell(fp);                
                rewind(fp);

                if(size < 2 * sizeof(CODECHDR)) {
                        wprintf(L"the file %s is too small %d bytes.\n", argv[2], size);
                        fclose(fp);
                        return;
                }

                unsigned char* spec = new unsigned char[size];
                fread(spec, 1, size, fp);
                fclose(fp);

                struct CODECHDR* phdr = (CODECHDR *)spec;
                unsigned char* gray = new unsigned char[phdr->width * phdr->height];
                
                gCodec.initgray(phdr->width, phdr->height);
                int res = gCodec.decompressgray(gray, spec);
                if (res < 0) {
                        wprintf(L"failed to decompress: %d\n", res);
                        delete[] gray;
                        delete[] spec;
                        return;
                }
                size = res;

                unsigned int width = phdr->width;
                unsigned int height = phdr->height;                
                delete[] spec;

                unsigned char* bgr = new unsigned char[3 * size];   //arrange RGB buffer for saving image
                for (unsigned int i = 0; i < size; i++) {
                        bgr[3*i] = gray[i];
                        bgr[3*i+1] = gray[i];
                        bgr[3*i+2] = gray[i];        
                }
                delete[] gray;

                Gdiplus::Bitmap image(width, height, 3 * width, PixelFormat24bppRGB, bgr);
                CLSID encoder;
                if (get_encoder_clsid(L"image/bmp", &encoder) >= 0) {
                        image.Save(L"ezw.bmp", &encoder);
                        ShellExecute(0, L"open", L"ezw.bmp", 0, 0, SW_SHOWNORMAL);
                }
                else
                        wprintf(L"failed to get encoder to save reconstructed image.\n");

                delete[] bgr;                
        }
        else
                wprintf(L"failed to open %s", argv[2]);
}





void change_extension(wchar_t* path, const wchar_t* ext)
{
        for (int i = (int)wcslen(path) - 1; i > 0; i--) {
                if (path[i] == '.') {
                        path[i] = 0;
                        wcscat(path, ext);
                        return;
                }
        }
        wcscat(path, ext);
}

int get_encoder_clsid(const WCHAR* format, CLSID* pClsid)
{
        UINT  num = 0;          // number of image encoders
        UINT  size = 0;         // size of the image encoder array in bytes

        Gdiplus::ImageCodecInfo* pImageCodecInfo = NULL;

        Gdiplus::GetImageEncodersSize(&num, &size);
        if (size == 0)
                return -1;  // Failure

        pImageCodecInfo = (Gdiplus::ImageCodecInfo*)(malloc(size));
        if (pImageCodecInfo == NULL)
                return -1;  // Failure

        Gdiplus::GetImageEncoders(num, size, pImageCodecInfo);

        for (UINT j = 0; j < num; ++j) {
                if (wcscmp(pImageCodecInfo[j].MimeType, format) == 0) {
                        *pClsid = pImageCodecInfo[j].Clsid;
                        free(pImageCodecInfo);
                        return j;  // Success
                }
        }

        free(pImageCodecInfo);
        return -1;  // Failure
}

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License

This article, along with any associated source code and files, is licensed under The GNU General Public License (GPLv3)

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About the Author

Chesnokov Yuriy
Engineer
Russian Federation Russian Federation
No Biography provided

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