Inviting Lecturer of California State University for Guest Lecture

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Prof. Geoff
Prof. Geoff Dougherty, a lecturer of California State University. (Photo:

UNAIR NEWS – Some fields of study, such as medical physics, have an association with an image output. In order to support such image processing capabilities, S1 Technobiomedic Faculty of Science and Technology (FST) Universitas Airlangga  (UNAIR) held a series of guest lectures on Medical Image with Prof. Geoff Dougherty, lecturer of California State University, in Room 205, Postgraduate Building, Campus B UNAIR on Tuesday, April 3.

“Thank you for taking part in this guest lecture. The workshop will be held for five meetings. So, everyone attending is expected to follow the whole series, “said Dr. Suryani Dyah Astuti, M. Si., Lecturer of S1 Technobiomedic UNAIR in the opening of the guest lecture.

Prof. Geoff is known as a professional engineer, especially in the field of medical images.Prior to his dedication at California State University, he had taught at Kuwait University. Furthermore, Prof. Geoff also wrote a book called Digital Image Processing for Medical Applications. All guest lecture participants can access the e-book for free.

In that first meeting, Prof. Geoff explained the difference between analog and digital data including how to convert analog data to digital. Analog objects such as Monalisa painting experience continuous color changes. Meanwhile, the digital one changes suddenly in the form of pixels with code range 0-225 from black to white.

Then, the exposure was continued with the introduction of ImageJ application along with its components. Each participant, was encouraged to bring a laptop and install the ImageJ application so that it can practice the science directly.

“The ImageJ application is developed by the Java programming language . It is easy to use to give quantitative results on images such as area, color, length, and object angle. There are many plugins with various features such as brightness, texture, and color, “explained Professor Geoff.

Prof. Geoff Dougherty during presentation in a guest lecture at Room 205, Postgraduate Building, Campus B UNAIR on Tuesday, April 3. (Photo: Siti Nur Umami)

Prof. Geoff patiently guided the participants to operate the ImageJ from changing the image from RGB- color to 8 bit  so the image became gray and changing the brightness level of the image to analyze the area of ​​each particle. According to him, when there is lack of brightness, the image will experience false contours.

“In this application, there is also a simple image processing feature. For example, crop to cut the parts that want to be analyzed, “he said.

At the end of the session, Suryani appealed to the participants to attend the next meeting because this series of guest lectures were very important and the material has continuity. (*)


Author: Siti Nur Umami

Editor: Feri Fenoria

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