Method and system for measuring modulation transfer function of digital input equipment

The invention provides a method for measuring a modulation transfer function of digital input equipment. The method comprises the following steps: acquiring an image obtained by photographing a preset test card by a camera to be tested; selecting a blade edge area from the acquired image; on the basis of a preset inclined edge method, calculating the selected edge region to obtain an MTF (Modulation Transfer Function) value; if it is judged that the MTF value is larger than the preset threshold value, a preset filter is adopted to conduct multiple times of filtering on the selected blade edge area till the MTF value obtained by recalculating the blade edge area after a certain time of filtering is smaller than the preset threshold value; and outputting the MTF value smaller than the preset threshold value as the MTF value finally measured by the camera to be measured. The invention also provides a system for measuring the modulation transfer function of the digital input equipment. By implementing the method,