Abstract
In a picture coding, DCT (Discrete Cosine Transform) processing has an advantage in efficiency. However, degradations called block artifact and mosquito noise are appeared in reconstructed pictures. We realize the quantitative estimation method that determines the mosquito blocks. In this method, the ratio of spatial activity is taken between the mosquito block and neighbor flat block. We test the proposed method by using reconstructed pictures which are coded by different quantization scale. We recognize that the results are almost reasonable on subjective picture quality.
