Compression ratio is the ratio of the compressed data size to the original uncompressed data size. A lower ratio typically indicates a smaller result and higher compression effectiveness (though the interpretation can vary by definition). Data with many repeated patterns, such as that processed by run-length encoding, tends to achieve a higher degree of compression.

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• 2010h22a #85図を画素で表す手法を考える。図１の場合，3×3 個の画素を左上から１行ずつ右方向へ１画素ずつ読み取り，黒なら B，白なら W と書くと“BWBBBBWB”（9…