Research On Image Processing In Embedded Browser

With the progress of Information Technology and Internet, embedded system has been widely used in electrical and electronic products and communication fields. Embedded browser is the most important application now, and then it may so much as be the only directly supported application in embedded system. As one of client software based-on HTTP protocol, embedded browser not only deals with text, but parses all kinds of images. So image processing is a basic function of embedded browser now.In contrast to the text, there are more data in images and the data are often compressed. So there is longer latency in compressing, transmitting and parsing the data of images. For improving interaction , a specific technique of image processing is designed and implemented in self-developed embedded browser, JLBrowser. The key technologies of embedded browser images processing are images transmission, images parsing, images storage and images rearrangement. The parallel transmitting mechanism of multithreads is used to improve the transmission efficiency. Generally, browser should receive the full data of large size image for many times, and the data of image files are stored according to the structure. In order to overlap transmission latency and resolute latency, the images are parsed by segments. Although the full data of one image file still don't arrive, parsing can also be started . According to the characteristic of embedded system, some memory is used to save the original image and the parsed image data. Then the image latency is reduced. Image rearrangement is used to display the outline of page as soon as possible. If image tags without valid size are met, HTML paring module will put a default image size into the page, rather than wait until the complete of image processing. After valid size is gotten, the rearrangement of image objects in related page is triggered.