提示,從你所引用的文章: =========================================================================== First, the red pixel that the red ray fell onto, will very accurately record its intensity value ===========================================================================
然後請你把red換成blue、green想一想。
Luminance(亮度)定義: Luminance is a photometric measure of the luminous intensity per unit area of light travelling in a given direction.
Bayer計算法說穿了就是將紅色那100萬點左右上下加權平均後補足其他300萬點,綠色、藍色也一樣補足400萬點。然後每個畫元(Element) 就擁有RGB三個向量,就可產生一組完整的輝度及色度信號。共可產生400萬組新的 假"畫素" 。這些假畫素中自然充滿了假色與假輝度成分。然後再用影像預測法,將明顯不合理的顏色刪掉。有疑問的通通去色只留輝度 (黑白成分) 。輝度有疑問的就借隔壁的來用, 就是這樣。 no more no less =============================================================
其中文章提到 : To construct a color RGB image from this sampling method, 66% of the intensity values must be calculated. Also note that the resolving element is the 2 x 2 Bayer Filter Pattern that was used to sample the image. This means that an image captured by a 2048 x 2048 sensor actually has resolution of only 1024 x 1024. 他將解析度直接除二, 可是沒說怎麼判斷的!
我將他的照片中標示黃框的部分, 四個相鄰的pixel都有不同的亮度 就如同樓上570所說, 這些拼圖也許以樓主的論述是雜塊, 但是對解析度是有幫助的. 如果你把每四格都塗滿同一色, 那才是真正的 1024 x 1024