However, this process is visible only when the file to be transmitted is large in size, such as the 5MB video in this example. The software performs this process automatically as you send the file to one of your friends. For example, in the case of a 5MB video file, the image/video compression software running behind the preparing mode in WhatsApp software makes the video smaller by up to 1MB, thus saving the memory space for transmission to take place. The main job of the image/video compression algorithm is to reduce the size of the file to be transmitted. 1: Compression process in mobile using WhatsApp software: (a) Application in preparing mode, (b) Application in sending mode So here we will restrict ourselves to discussing the typical image/video compression algorithm that runs behind the preparing mode. The sending mode basically deals with transmission of data stream onto the communication channel. The application performs compression in two steps: (a) preparing mode and (b) sending mode. 1 shows screenshots of the author’s mobile as it compresses the video using WhatsApp software. This article dwells on the image/video compression concept that is being used by nearly all the Internet-based messaging applications.įig. All of us make extensive use of these applications without knowing what actually goes behind the scene in transmitting high-quality images and text.

These applications let users send and receive text messages and videos. Over the last few years, messaging apps like WhatsApp, Viber and Skype have become increasingly popular. It works for both coloured and grayscale images. Presented here is a MATLAB-based program for image compression using discrete cosine transform technique.

Image compression software open source