Color Line CCD

Tri-linear Camera Scan direction „ Camera has only one sensor. „ The sensor consists of 3 separate lines. One each for red, green and blue color information. „ Since the 3 lines have space between them, the lines have different fields of view. Movement of the conveyer „ The conveyer belt has to move straight. „ No rotation of the object for matching to a RGB image. YES!NO! Orientation camera to conveyer „ The camera must be aligned perpendicular to the conveyer. Spatial correction (1/3) „ If we want the full information for area A, we must use information from 3 different line captures. „ For this example, we need to take the red line data and combine it with the green line data from 7 exposure later and the blue data from 14 exposures later. Area A Spatial correction (2/3) „ Add the matching of these 3 lines to produce a combined output is known as spatial correction. „ If matching is not done correctly, haloing occurs. Raw image Corrected image Spatial correction (3/3) Raw Image Raw Corrected Corrected Image Spatial correction (direction) Elimination of haloing (1/6) There are a few requirements to successfully remove haloing: „ Straight conveyor motion „ Sensor Perpendicularity „ Sensor Parallelism Elimination of haloing (2/6) „ Straight conveyer motion The conveyer must provide a straight and accurate feed. YES! Elimination of haloing (3/6) „ Straight conveyer motion If the conveyer does not move straight, the different lines will scan different areas Elimination of haloing (4/6) „ Sensor Perpendicularity Elimination of haloing (5/6) „ Sensor Parallelism – Long axis rotation Image is magnified differently at different line locations Elimination of haloing (6/6) „ Sensor Parallelism – Short axis rotation Image is magnified differently at different point of the line 3 CCD Camera(1/2) „ 使用菱鏡將RGB色彩分離。 „ 3CCD有同一光學水平，不同 於Tri-Linear Camera會因 Camera 與物體之間的水平與 垂直的關係造成顏色不正確。 Tri-linear Camera Movement of the conveyer Orientation camera to conveyer Spatial correction (1/3) Spatial correction (2/3) Spatial correction (3/3) Spatial correction (direction) Elimination of haloing (1/6) Elimination of haloing (2/6) Elimination of haloing (3/6) Elimination of haloing (4/6) Elimination of haloing (5/6) Elimination of haloing (6/6) 3 CCD Camera(1/2)