OpenCV/Patch to support WebP format on OpenCV 2.2

OpenCV/Patch to support WebP format on OpenCV 2.2 †

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概要 †

OpenCV 2.2でWebP形式のフォーマットを扱えるようにするパッチです．
※こちらで配布されているOpenCV-2.2.0-win.zipを対象としたパッチです．

ダウンロード †

Version	Filename	Size	Date	Type	Download
1.0	opencv2.2_webp_enable_patch_20110420.zip	12.4 KB	20110420	zip
1.1	opencv2.2_webp_enable_patch_20110423.zip	12.5 KB	20110423	zip

変更履歴 †

使い方 †

1. 上記リンクからopencv2.2_webp_enable_patch_20110423.zipをダウンロードして展開します．
2. 展開したmodulesディレクトリをOpenCVのmodulesディレクトリに上書きします．
3. こちらからPrecompiled WebP utilities and libraryをダウンロードします． ※執筆時の最新版はlibwebp-0.1.2-windows.zip
4. libwebp-0.1.2-windows.zipを展開します．
5. dev\Libにあるlibwebp_a.libを下記ディレクトリにコピーします．

   3rdparty\lib

6. dev\Includeにあるwebpディレクトリを下記ディレクトリにコピーします．

   3rdparty\include

7. OpenCVをCMakeを用いてビルドします．

Linux，Macに適用する場合には，パッチ（下記ファイル）の改行コードをあらかじめnkfコマンド等でLFに変換して下さい．

• opencv2.2_webp_enable_patch_20110423\modules\highgui\include\opencv2\highgui\highgui_c.h
• opencv2.2_webp_enable_patch_20110423\modules\highgui\src\grfmt_webp.cpp
• opencv2.2_webp_enable_patch_20110423\modules\highgui\src\grfmt_webp.hpp
• opencv2.2_webp_enable_patch_20110423\modules\highgui\src\grfmts.hpp
• opencv2.2_webp_enable_patch_20110423\modules\highgui\src\loadsave.cpp

おまけ †

下記のような設定をすることで圧縮時のquality(0～100)を指定できます． ※例では最大の100を指定．

int param[2];
param[0] = CV_IMWRITE_WEBP_QUALITY;
param[1] = 100;
cvSaveImage("img.webp", img, &param[0]);

制限事項 †

• Windows 32bit，Linux 32bit，Mac OS X 10.6 64bitのみで検証．
• 保存対象画像となるdepthは8Uのみです
• 64bitのビルド済みWebPライブラリは配布されていないため自身でビルドが必要です
  • ソース
  • ビルド方法 }}

    #multilang(en){{

Abstract

This page describes the method to use WebP format on OpenCV 2.2.
This patch is intended for OpenCV-2.2.0-win.zip in Official Release.

Download

Version	Filename	Size	Date	Type	Download
1.0	opencv2.2_webp_enable_patch_20110420.zip	12.4 KB	20110420	zip
1.1	opencv2.2_webp_enable_patch_20110423.zip	12.5 KB	20110423	zip

ChangeLog?

Usage

1. Please download opencv2.2_webp_enable_patch_20110423.zip. And,extract this file.
2. Please overwrite the patch's modules directory to OpenCV/modules.
3. Please download Precompiled WebP utilities and library from Official page. When I described this page, latest WebP Library is libwebp-0.1.2-windows.zip.
4. Please extract libwebp-0.1.2-windows.zip.
5. Please copy to the following directory from libwebp_a.lib in dev\Lib.

   3rdparty\lib

6. Please copy to the following directory from webp directory in dev\Include.

   3rdparty\include

7. Please build OpenCV using CMake

If you want to apply this patch to OpenCV-2.2.0.tar.bz2(Linux or Mac), please convert newline character of these file to LF from CRLF.

• opencv2.2_webp_enable_patch_20110423\modules\highgui\include\opencv2\highgui\highgui_c.h
• opencv2.2_webp_enable_patch_20110423\modules\highgui\src\grfmt_webp.cpp
• opencv2.2_webp_enable_patch_20110423\modules\highgui\src\grfmt_webp.hpp
• opencv2.2_webp_enable_patch_20110423\modules\highgui\src\grfmts.hpp
• opencv2.2_webp_enable_patch_20110423\modules\highgui\src\loadsave.cpp

Tips

You can specify the compression quality(min:0, max:100) by the following settings.

int param[2];
param[0] = CV_IMWRITE_WEBP_QUALITY;
param[1] = 100;
cvSaveImage("img.webp", img, &param[0]);

Limitation

• I have only tested this environment.
  • Windows 32bit
  • Linux 32bit
  • Mac OS X 10.6 64bit
• Save image depth supports 8U only.
• If your environment is 64bit, you need to build WebP library yourself.
  • source
  • build method

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