Patent ID: 8248474

Claim:
A surveillance system, comprising: a low-resolution camera to capture a scene to obtain a low resolution image; a high-resolution camera to capture the same scene to obtain a high resolution image, wherein the low resolution image has a same content with the high resolution image, and an image size of the low resolution image is smaller than an image size of the high resolution image; a processing unit; and a storage unit connected to the processing unit and storing a plurality of modules to be executed by the processing unit, wherein the plurality of modules comprise: a detecting module to check the low resolution image to find a reference image in the low resolution image; a coordinate determining module to determine coordinates of the reference image in the low resolution image, and coordinates of a corresponding reference image in the high resolution image according to a ratio of the image sizes of the low resolution image and the high resolution image; an editing module to select the reference image in the high resolution image according to the coordinates of the reference image in the high resolution image, crop and resize the selected reference image according to the ratio of the image sizes of the low resolution image and the high resolution image, and replace the reference image in the low resolution image with the cropped and resized reference image to obtain a new image; and an identifying module to compare the cropped and resized reference image in the new image with a standard image to determine whether the two images are different.