*4.2. Experiment of Improved Bi-Histogram Equalization*

To illustrate the effectiveness of the proposed IBHE method in segmenting image, the breakpoint by Kim, Y.T. [17] was used to make comparison. The results are shown in Figure 8.

**Figure 8.** Segmentation results with different breakpoints: (**a**) test image; (**b**) breakpoint by the method in [17]; and (**c**) breakpoint by the proposed Improved Bi-Histogram Equalization (IBHE).

As shown in the red square of Figure 8b,c, the segmentation effect is basically the same, while, in the yellow as well as green squares, the segmentation is more accurate by the proposed IBHE method than by the method in [17] according to the test image.
