Abstract: An image processing apparatus and an image-based test strip identification method are provided. In the method, multiple representative values on a first axis of a test strip image are determined. The test strip image is obtained by capturing a test strip. A second axis parallel to a test line or a control line of the test strip is perpendicular to the first axis. A test result of the test strip is determined according to a difference between a first representative value and a second representative value of the representative values. The test result includes a positive result and a negative result.