Estimation method for image matching effect

Abstract

The present invention discloses an evaluation method of image matching effect, which is used on a computer or a video system indication device. Two frames of images of an external object are acquired through a photosensitive detector array to form a reference frame and a target frame; a reference block is selected from the reference frame, and a plurality of search blocks are selected from the target frame; correlation calculation is carried out orderly to the reference block and each search block so as to obtain a plurality of matching error values; the proportion that the minimum matching error value accounts for in the accumulated value of all matching errors, and if the proportion is greater than a critical value, the matching effect is judged to be bad, thereby displacement vector cannot be output or the reference frame cannot be replaced.

Description

【Technical field】 [0001] The present invention relates to a method for evaluating image matching effect, in particular to a method for evaluating image matching effect in an optical pointing device. 【Background technique】 [0002] An optical pointing device, such as a mouse, is one of the most commonly used human-machine interface devices. When the user moves the mouse on the work surface, the motion sensing device inside the mouse senses the movement, thereby controlling the corresponding movement of the pointer on the computer screen. Optical sensing devices in the prior art generally include a light emitting device (such as a light emitting diode) and a photosensitive detector array, wherein the photosensitive detector array is usually arranged in a two-dimensional array to sense the characteristics of the mouse pad or desktop, mouse movement The judgment of displacement is mainly to complete the determination of the direction of motion and the magnitude of displacement ...

AI Technical Summary

Problems solved by technology

Optical sensing devices in the prior art generally include a light emitting device (such as a light emitting diode) and a photosensitive detector array, wherein the photosensitive detector array is usually arranged in a two-dimensional array to sense the characteristics of the mouse pad or desktop, mouse movement The judgment of displacement is mainly to complete the determination of the direction of motion and the magnitude of displacement by calculating the correlation between the newly captured sampled image (or "frame") and the previously captured reference image, which is the matching process. Select a part of the image in one frame image as a reference block, and then perform matching calculations on the reference block and the second frame image at different positions, and select the best matching position to obtain the displacement vector. However, in actual use, The obtained image may be blurred because the mouse is lifted off the desktop during the movement and the focus is not aligned, or the obtained image may be blurred when moving on an extremely smooth plane (such as glass), and a judgment error occurs during the matching process , so that the calculated displacement vector is not the actual displacement of the mouse, which makes the movement track of the cursor on the screen used with the mouse abnormal

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