DISTORTION CORRECTION IMAGE PROCESSOR AND PROGRAM

PROBLEM TO BE SOLVED: To provide a device and a program which efficiently compress an LUT for distortion correction to reduce information quantity.SOLUTION: An image processor comprises image correction means 10 for correcting distortion of image data. The image correction means has a correction val...

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Bibliographic Details
Main Authors OLNEY STEVEN, OBUCHI EISAKU
Format Patent
LanguageEnglish
Japanese
Published 19.01.2017
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Summary:PROBLEM TO BE SOLVED: To provide a device and a program which efficiently compress an LUT for distortion correction to reduce information quantity.SOLUTION: An image processor comprises image correction means 10 for correcting distortion of image data. The image correction means has a correction value storage part 11, an LUT expansion part 12, and a coordinate conversion part 13. The correction value storage part stores an offset code table 11a and a compression LUT 11b. The offset code table associates an offset value between a coordinate value before correcting distortion and a coordinate value after correcting distortion with a predetermined offset code. The compression LUT associates the offset code with a coordinate value which is compressed referring to an offset value corresponding to the offset code. The LUT expansion part generates an LUT 11c for correction in which the coordinate value before correcting distortion is associated with the coordinate value after correcting distortion based on the offset code table and the compression LUT. The coordinate conversion part corrects a coordinate value of image data based on the LUT for correction.SELECTED DRAWING: Figure 1 【課題】歪み補正用のLUTを効率的に圧縮して情報量を低減させる装置及びプログラムを提供する。【解決手段】画像処理装置は,画像データの歪みを補正する画像補正手段10を備える。画像補正手段は,補正値記憶部11,LUT展開部12,及び座標変換部13を有する。補正値記憶部は,オフセットコードテーブル11aと圧縮LUT11bを記憶している。オフセットコードテーブルは,歪み補正前の座標値と歪み補正後の座標値とのオフセット値を,所定のオフセットコードと対応付ける。圧縮LUTは,オフセットコードを,当該オフセットコードに対応するオフセット値を参照して圧縮された座標値と対応付ける。LUT展開部は,オフセットコードテーブルと圧縮LUTとに基づいて,歪み補正前の座標値と歪み補正後の座標値とを対応付けた補正用LUT11cを生成する。座標変換部は,補正用LUTに基づいて,画像データの座標値を補正する。【選択図】図1
Bibliography:Application Number: JP20150134419