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No specific pedagogical methods are dedicated to explain the specificity of CMOS Active Pixel Sensor (APS) technologies. Nevertheless, this technology of image sensing is wide-spread in today's life and needs a good understanding on behalf of our students in microelectronics. This paper proposes a toolkit implemented with MATLAB. This toolkit can help the student to find out the architecture of an active pixel sensor imager. With such approach, student is able to easily control, visualize and understand how an image is elaborated.