Panel adsorption device and automatic adsorption method using the same

A panel adsorption device, including:

• a platform, including a plurality of vacuum adsorption holes, wherein the platform is used to carry a liquid crystal panel;
• at least one image capture device, disposed above the platform, wherein the image capture device is configured to collect an image of a liquid crystal panel on the platform;
• a processing device, connected to the image capture device, wherein the processing device receives an image captured by the image capture device, extracts image data, and calculates and determines a boundary range of the liquid crystal panel according to the image data;
• a vacuum machine, connected to the processing device, wherein the vacuum machine is configured to set a vacuum adsorption hole in the boundary range to a negative pressure state according to the boundary range of the liquid crystal panel determined by the processing device, so that the liquid crystal panel is adsorbed on the platform;
• at least one lighting device, installed above the platform, and used to provide a light source to the image capture device to form bright field illumination;
• wherein the processing device further includes:
• a grayscale preprocessing module, configured to perform grayscale processing on the captured image to form a grayscale image;
• a grayscale image threshold calculation module, connected to the grayscale preprocessing module and configured to segment the grayscale image by using a threshold, wherein a threshold of the grayscale image adopts an adaptive threshold related to an image average grayscale;
• a closed image forming module, connected to the grayscale image threshold calculation module, and configured to scan the grayscale image, and to determine all boundary points, and to connect the boundary points into a closed figure;
• a boundary line segment selection module, connected to the closed image forming module, and configured to extract a longer line segment in the closed figure;
• and
• a geometric image boundary determination module, connected to the boundary line segment selection module, and configured to determine whether the longer line segment satisfies a feature of a standard geometric figure, and if the longer line segment satisfies the feature of the standard geometric figure, the boundary range of the liquid crystal panel is determined, and otherwise the boundary line segment selection module is invoked, again.