Canvas File name

how can i save image captured and shown on canvas? i can save uploaded picture using this

<uploader file-name="image" v-show="isPhotoTaken" id="photoTaken"/>

but can't save the captured image on webcam.

<canvas v-show="isPhotoTaken" id="photoTaken" ref="canvas" :width="450" :height="337.5"> </canvas>

is there a way on changing file name on canvas?