Canon 3622B002 User Manual - Page 15
Detection Functions, Image Processing, Double-Feed Detection by Document Length
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Detection Functions ● Auto Image Type Detection The scanner automatically detects whether documents are in black and white or color. ● Auto Paper Size Detection The document page size is detected before scanning. Fixed-Size Scanning Auto-Size Detection Scanning ● Skew Detection The scanner stops feeding when a skewed document is detected as it touches the edge of the feeder inlet. (See "Skew Detection" on p. 4-6.) ● Staple Detection The scanner stops feeding when it detects the presence of stapled documents. (See "Staple Detection" on p. 4-6.) ● Ultrasonic Double-Feed Detection The scanner stops feeding when the ultrasonic sensor detects that two or more document pages are feeding at the same time. (See "Double-Feed Detection" on p. 4-5.) * A non-detection zone can be specified to avoid doublefeed detection in areas such as those containing adhesive labels. ● Double-Feed Detection by Document Length The scanner stops feeding when a double feed is detected by comparing document lengths. (See "Double-Feed Detection" on p. 4-5.) * Using the length of the first document page as a reference, the scanner detects a double feed when a page of a different length is fed. Chapter 1 Before You Start Using the Scanner ● Prescan At the start of scanning, this function prescans the first page of a document and pauses so that you can use the first image to adjust the brightness and contrast before resuming scanning. ● Verify Scan While scanning, the count of document pages scanned is verified against a pre-specified count or the count obtained from Count-Only Mode. (See "Verify Scan" on p. 4-4.) ● Text Orientation Detection The text orientation on each page is detected, and the scanned image is rotated in 90-degree increments as necessary for normalization. Feeding Direction The text orientation is detected and the image is rotated Image Processing ● Prevent Bleed Through/Remove Background Prevents the background or original image on the reverse side of thin originals from appearing in scanned images. ● Image Rotation The scanner can rotate scanned images in 90° increments, or detect the text orientation and rotate the image in 90° increments to correct its orientation. 1-7