Handwritten test question answer extraction method

Abstract

The invention discloses a handwriting test question answer extraction method which comprises the following steps: taking one picture as a source test question picture A, taking the other picture as ato-be-extracted answer picture B, photographing and uploading; the method further comprises the following steps of S1, performing corresponding preprocessing on the graph A and the graph B, such as size scaling, and extracting feature points; S2, subjecting feature points of the graph A and the graph B to initial matching through a rough matching method, calculating a homography matrix from the graph B to the graph A, correspondingly mapping the graph B into a graph C, wherein at the moment, the graph C and the graph A are consistent in size and close in angle. The method is scientific and reasonable in structure and safe and convenient to use, the online test question marking function is improved, the problem that the angle and flatness degree of pictures uploaded by students are low is solved, answers are convenient to extract, inconvenience brought by the extremely high precision requirement in the past is reduced, and the method is suitable for application and popularization.

Description

technical field [0001] The invention relates to the technical field of image processing, in particular to a method for extracting answers to handwritten test questions. Background technique [0002] Examination is a strict method of knowledge level identification. Through the examination, students' learning ability and other abilities can be checked. In order to ensure the fairness and fairness of the results, the examination room must have strong discipline constraints, and there are special supervisors such as examiners and invigilators. During the examination process, any cheating is absolutely prohibited, otherwise you will bear legal and criminal responsibility. The examination is to let a group of people with different educational resources complete the same answer sheet within a certain period of time. However, the significance of the examination is not limited to this. The examination It can also be an all-round assessment of a person for a goal, so this kind of exam...

AI Technical Summary

Problems solved by technology

[0004] The present invention provides a method for extracting answers from handwritten test questions, which can effectively solve the problems raised in the above background technology. The more, the online test question review function can effectively reduce the work of teachers, and put more energy on teaching work and research on students' knowledge mastery. The current online test question review function, which obtains the test questions uploaded by students and extracts the answers, is often accurate. The degree of accuracy is not enough, or the angle and flatness of the pictures uploaded by students are high, and it is inconvenient to use

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