CAJ | 학술논문

提出一种无失真图像逐步传输法,该方法改进了Chang等人的早期PIT方法.原方法由于没有考虑到各图像区域的意义,解码初期的图像质量不够理想.为此,提出以"优先位图"表示区域的复杂度,利用这种优先位图可在传输的初期就将图像的重要特征发送给接收方.实验结果表明,该方法在峰值信噪比和视觉质量两方面均优子过去的无失真图像逐步传输方法.
제출일충무실진도상축보전수법,해방법개진료Chang등인적조기PIT방법.원방법유우몰유고필도각도상구역적의의,해마초기적도상질량불구이상.위차,제출이"우선위도"표시구역적복잡도,이용저충우선위도가재전수적초기취장도상적중요특정발송급접수방.실험결과표명,해방법재봉치신조비화시각질량량방면균우자과거적무실진도상축보전수방법.
In this paper,we describe a progressive-image-transmission(PIT)scheme based on block-based PIT for lossless images.It is inspired by a previous PIT method presented by Chang et al.Because the original method does not take the significance of each block into consideration,the quality in early stages of decoding is not desirable. To improve it,we propose an enhanced scheme in which a prior bitmap was used to indicate the complexity of each block.Based on the prior bitmap,significant information of an image can be transmitted to receiver(s)in early stages of transmission.Experimental results show that the proposed scheme can achieve better results both in PSNR values and in visual quality than other former lossless PIT schemes.