Scanning and recognizing device and method based on triaxial accelerometer

Abstract

The invention discloses a scanning and recognizing device and a scanning and recognizing method based on a triaxial accelerometer and relates to the field of image processing. The device comprises an optical sensor, the triaxial accelerometer and a control module, wherein the optical sensor is used for continuously shooting a scanned character to acquire an image frame sequence comprising the scanned character; the triaxial accelerometer is used for measuring a relative displacement among image frames in the image frame sequence; and a control module is used for performing down-sampling on the image frame sequence according to the relative displacement measured by the triaxial accelerometer, splicing acquired sampling frames, performing character recognition on a spliced panoramic image and thus obtaining a character code of the scanned character. In the device and the method, a large amount of calculation among the image frames, particularly large-size image frames, is avoided by measuring the displacement between the adjacent image frames through the triaxial accelerator, performing accurate down-sampling on the image frame sequence according to the displacement and searching from a given window to calculate spliced information of images of the adjacent sampling frames; therefore, load of the control module is reduced greatly, the splicing speed is increased and the high-precision alignment is realized.

Description

technical field [0001] The invention relates to the field of image processing, in particular to a scanning recognition device and method based on a three-axis accelerometer. Background technique [0002] Electronic scanning pen (referred to as scanning pen) is one of the important applications of OCR. The optical camera of the scanning pen continuously takes pictures of the scanned data according to a certain frequency, obtains the image frame sequence of the scanned data, and then stitches the image frame sequence into a panoramic image for OCR processing. [0003] When the user uses the scanning pen to scan, the scanning speed changes. A typical usage method is that when the scanning is just started, the scanning speed of the scanning pen increases gradually from zero, then reaches a speed peak, and then the speed gradually increases. Decrease until the end of the scan. In the case of ensuring that there is a certain amount of overlapping content between adjacent image fr...

AI Technical Summary

Problems solved by technology

When the current image frame and one or more image frames before the previous frame also have a certain overlapping content, especially for larger images, in the process of registering and splicing every two adjacent image frames, it is necessary to carry out A large number of calculations occupy hardware resources and reduce the splicing speed of the entire image frame sequence

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