In this paper, talk about how to change the contrast and brightness of the picture, in fact, the image pixel values ​ linear change only, the contrast corresponds to the coefficient of linear change, the brightness corresponding constant. Reference to own tutiol its code opencv development environment: the ubuntu12.04+opencv2.4.2+Qt4.8.2+QtCreator2.5 experimental feature: click Open image button in the computer to open a picture and display it. Drag the Contrast slider to change the value of the contrast, you can see the contrast value of the process of change in the slider below the left picture corresponds to the effect of its contrast change. Drag the Brightness slider to change the brightness value, the slider below to see the changes in the brightness values ​ ​ in the left picture corresponds to its effect in the brightness changes. Click the Close button to exit the program.

change_value
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