JP5801002B2 - 画素補正方法及び撮像装置 - Google Patents
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Description
26 カラーイメージセンサ
51a,51b 通常ピクセル
52a,52b 位相差ピクセル
71 通常画像データ
72 第1混合画像データ
73 第2混合画像データ
81 画素信号補正処理部
101,104,121A,121B エッジ
Claims (11)
- 入射光を等方的に受光する複数の通常ピクセルと、入射光の一部を選択的に受光する複数の位相差ピクセルとを有するカラーイメージセンサと、
複数の前記通常ピクセルからの画素信号を同色同士で混合し、または複数の前記位相差ピクセルからの画素信号を同色同士で混合して同種混合画素の混合信号を生成する同種画素混合と、前記通常ピクセルと少なくとも1つの前記位相差ピクセルからの画素信号を同色同士で混合して異種混合画素の画素信号を生成する異種画素混合とを行い、前記同種混合画素と前記異種混合画素とから構成される混合画像を生成する画素混合部と、
前記通常ピクセル及び前記位相差ピクセルの同色同士での前記画素信号、または前記同種混合画素及び前記異種混合画素の同色同士での前記画素信号を用い、その差が最大となる第1方向を検出することにより、この第1方向に垂直な被写体のエッジを検出するエッジ検出部と、
前記異種画素混合が前記エッジをまたいで行われている場合に、前記第1方向に垂直で前記エッジに沿った第2方向に存在し、かつ補正すべき前記異種混合画素と同色である前記同種混合画素を用い、その画素信号による補間処理で、前記異種混合画素の画素信号を補正する補正部と、
を備える撮像装置。 - 前記通常ピクセルには三原色に対応した少なくとも3種類があり、前記位相差ピクセルには前記三原色の1色に対応した少なくとも1種類がある請求項1記載の撮像装置。
- 前記補正部は、前記第1方向に垂直で前記エッジに沿った第2方向に存在しており、補正すべき前記異種混合画素と同色の前記同種混合画素を用い、これらの同種混合画素の画素信号の平均値を算出して、補正すべき前記異種混合画素の画素信号を前記平均値で置き換える請求項2に記載の撮像装置。
- 前記画素混合部は、4個の同色の画素信号を混合して前記混合画像を生成するものであり、前記異種画素混合では少なくとも1個の前記位相差ピクセルの画素信号を用いている請求項2に記載の撮像装置。
- 前記画素混合部は、2個の同色の画素信号を混合して前記混合画像を生成するものであり、前記異種画素混合では1個の前記通常ピクセルと1個の前記位相差ピクセルとの各画素信号を用いている請求項2に記載の撮像装置。
- 前記エッジ検出部は、前記異種画素混合によって画素信号が混合される前記通常ピクセルと前記位相差ピクセルを結ぶ方向と、該方向に垂直な方向との2方向について前記画素信号の差をそれぞれ算出する請求項1〜5のいずれか1項に記載の撮像装置。
- 前記エッジ検出部は、前記画素信号の差を算出する場合に、補正すべき前記異種混合画素に対して互いに反対側にある画素の画素信号を用いる請求項6に記載の撮像装置。
- 前記カラーイメージセンサは、複数の画素が正方配列された第1ピクセル群と、この第1ピクセル群と同じピッチで複数の画素が正方配列された第2ピクセル群とを有し、
前記第2ピクセル群の各画素は、前記第1ピクセル群の各画素に対して、斜め方向にずれた位置に配置され、
前記第1ピクセル群と前記第2ピクセル群には、それぞれ同じ配列の色フィルタが設けられている請求項1〜5のいずれか1項に記載の撮像装置。 - 前記位相差ピクセルが、前記第1ピクセル群と前記第2ピクセル群の斜め方向に隣接する同色の画素に設けられている請求項8に記載の撮像装置。
- 前記位相差ピクセルは、各前記正方配列の行方向と列方向に沿って4画素毎に設けられ、前記位相差ピクセルの間に、前記位相差ピクセルと同色であり、前記位相差ピクセルと同じピクセル群に属する前記通常ピクセルが含まれている請求項9に記載の撮像装置。
- 入射光を等方的に受光する複数の通常ピクセルと、入射光の一部を選択的に受光する複数の位相差ピクセルとを有するカラーイメージセンサを用いて、被写体を撮像するステップと、
複数の前記通常ピクセルからの画素信号を同色同士で混合し、または複数の前記位相差ピクセルからの画素信号を同色同士で混合して同種混合画素の混合信号を生成する同種画素混合と、前記通常ピクセルと少なくとも1つの前記位相差ピクセルからの画素信号を同色同士で混合して異種混合画素の画素信号を生成する異種画素混合とを行い、前記同種混合画素と前記異種混合画素とから構成される混合画像を生成するステップと、
前記通常ピクセル及び前記位相差ピクセルの同色同士での前記画素信号、または前記同種混合画素及び前記異種混合画素の同色同士での前記画素信号を用い、その差が最大となる第1方向を検出することにより、この第1方向に垂直な被写体のエッジを検出するステップと、
前記異種画素混合が前記エッジをまたいで行われている場合に、前記第1方向に垂直で前記エッジに沿った第2方向に存在し、かつ補正すべき前記異種混合画素と同色である前記同種混合画素を用い、その画素信号による補間処理で、前記異種混合画素の画素信号を補正するステップと、
を備える画素補正方法。
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