Digital Camera Reviews Quality Method

With the rapid development of science and technology,digital camera image quality enhances unceasingly.Digital camera is a kind of digital computer input device.Digital cameras can transform the digital information that is specific physical,manuscripts and so on,into a kind of digital information.Digital camera image quality will affect the subsequent processing and analysis.With the digital camera more and more common,accurately distinguish the quality of a digital camera is particularly important.At the same time.It is more and more people’s attention that How to measure the quality of the digital camera.The subject measured the quality of the digital camera from six aspects which were the dynamic range,white balance,sharpness,color difference of digital color,the color of coincidence and the image plane to coincidence degree.In CorelDRAW all-white card was designed.The grating(horizontal and vertical raster)and reticle having different line width were also designed.They were printouted by the coated paper.Digital camera by selecting the D65and F light source from the standard light box T60(5),respectively,shooted the test object and IT8.7/2 color target.According to the grayscale of IT8.7/2 target image distribution characteristics,We can select the appropriate threshold binarization.Then we can binarization,Morphological corrosion and expansion denoising.We can locate and segment 264 patch areas and 24 gray areas.by gray projection method and the geometrical relations.Twenty five percent of color piece and gray-scale area were acquired through the geometrical relations.The dynamic range,white balance and level of detail were measured by using segmented 24 gray area.Digital color quality measured through calculating fine segmented color patches 264.The images of horizontal and vertical raster were standard test chart.The color registration measured by the physical width of the MTFand line.Basing on the reticle image,the color of coincidence was evaluated by coincidence of rows and columns.Basing on the image of all-white card,the image plane to coincidence degree was measured by Calculating the brightness uniformity of four sampling areaThe software system that measured the quality of the digital camera was developed,using the C++programming language In Visual C++6.0.This software system realized evaluating of the quality of the digital camera automatically,which was by using six aspects were the dynamic range,white balance,sharpness,color difference of digital color,the color of coincidence and the image plane to coincidence degree.