33 results about "Standard test image" patented technology

The present invention includes a method of determining a location of a component on a workpiece. A before-placement standard image is acquired of an intended placement location on a standard workpiece. Then, a standard component is placed upon the standard workpiece and the placement is verified. An after-placement standard image is acquired and a standard difference image is created from the before and after standard images. Then, a before-placement test image is acquired of an intended placement location on the workpiece. A component is then placed upon the workpiece, and after-placement test image is acquired. A test difference image is created from the before and after test images. A first offset is calculated between the before standard difference image and the before test image. Then, the test difference is transformed based on the first offset to generate a difference test image (DTR) that is registered to the standard difference image. The standard difference image is correlated to the registered difference test image (DTR) to generate a registration offset indicative of placement efficacy.

A method for detecting the quality of the inner wall of a PCB via hole, comprising the following steps: Step 101: Obtain a PCB to be tested and a standard template; Step 102: Use terahertz wave imaging technology to collect the original image of the PCB to be tested and the original image of the standard template; Step 103: Perform thresholding and denoising processing on the original image of the PCB to be tested and the original image of the standard template to obtain the restored image to be tested and the restored image of the standard template; Step 104: Calculate the characteristic function of the restored image respectively, and obtain the via hole center and aperture information; Step 105 : Perform template matching operation on the feature information of the restored image of the standard template and the restored image to be tested; Step 106: If the matching operation result is within the allowable error range of production, then the detection is qualified; Step 107: If the result of the matching operation exceeds the allowable error range of production , it shows that the test failed. The invention effectively realizes the detection of the quality of the inner wall of the via hole and guarantees the quality of PCB products.

The invention suits the image processing field and provides a gray level image matching method and a system. The method comprises the following steps: acquiring a standard image and an image to be detected; respectively sampling the standard image and the image to be detected to obtain a standard sampling image and a sampling image to be detected; acquiring a rough matching region on the samplingimage to be detected according to the standard sampling image; and acquiring a target region on the image to be detected according to the rough matching region and the standard image. In the embodiment of the invention, the acquired standard image and the image to be detected are sampled to obtain the standard sampling image and the sampling image to be detected, the rough matching region is obtained on the sampling image to be detected according to the standard sampling image, and the target region can be obtained on the image to be detected according to the rough matching region and the standard image. The method has the advantages of less computation amount of the matching process, short time and accurate matching result.

The invention discloses a real-time image correction method based on a cell phone platform. The method comprises the following steps of: 1, capturing a standard test image and calculating a correction matrix by using the standard test image; 2, storing the correction matrix in an online database for real-time downloading; 3, inputting the height and the arm length of a cell phone user to obtain a cell phone photographing height, downloading all the corresponding correction matrix data from the online database according to the photographing height, and storing all the corresponding correction matrix data in the local memory of the cell phone; 4, subjecting the image captured by the cell phone to coordinate transformation: searching a correction matrix corresponding to the angle information acquired by a direction sensor in real time in the local memory of the cell phone, and transforming the coordinate of each pixel in the image captured by the cell phone in real time into the coordinate of each pixel in a corrected image according to the correction matrix and a given transformation relation; and 5, performing grayscale interpolation calculation to obtain the grayscale values of respective pixels in the corrected image with transformed coordinates.

A method for detecting display roughness of a display, comprising: selecting a plurality of areas on a white standard test image by an optical measuring instrument for optical consistency verification, and if the difference in optical consistency of the plurality of areas is greater than or equal to a threshold value, re-inspecting the Select a plurality of regions on the white standard test image until the optical consistency of the plurality of regions is the same, that is, the difference in optical consistency is less than the threshold; respectively select a test point in a plurality of regions with the same optical consistency; Under the backlight setting situation, with the white standard test image as the display background, detect the brightness value of each of the test points respectively; through the brightness value of each of the test points, calculate the brightness standard deviation σ of a plurality of test points And the average value of brightness μ, the roughness Grain is calculated by the following formula: the present invention can detect the roughness conveniently, effectively and quickly, with low cost and high reliability, and can be used to measure the quality of the display effect of the projection display.