  Due to the confined focal length of optical sensors, focusing all objects in
a scene with a single sensor is a difficult task. To handle such a situation,
image fusion methods are used in multi-focus environment. Discrete Cosine
Transform (DCT) is a widely used image compression transform, image fusion in
DCT domain is an efficient method. This paper presents a low complexity
approach for multi-focus image fusion and its VLSI implementation using DCT.
The proposed method is evaluated using reference/non-reference fusion measure
criteria and the obtained results asserts it's effectiveness. The maximum
synthesized frequency on FPGA is found to be 221 MHz and consumes 42% of FPGA
resources. The proposed method consumes very less power and can process 4K
resolution images at the rate of 60 frames per second which makes the hardware
suitable for handheld portable devices such as camera module and wireless image
sensors.
