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Give Me Your Digits!: Image Acquisition

Module by: Samuel Kim, Joel Khan, Yung-Seok Kevin Choi. E-mail the authors

Summary: Experimental setup for acquiring images.

Give Me Your Digits!: Image Acquisition

Camera Setup

A Canon XSI Digital SLR was mounted onto a tripod as shown below. A desk lamp was used for additional lighting. More specifically an 18-55mm zoom lens was used at the 18mm (fully zoomed out), the onboard flash was used on manual settings. Handwriting was standardized to half an inch in height with a pilot ballpoint pen to help simplify the subsequent image processing procedure.

Figure 1: Camera setup
Figure 1 (graphics1.jpg)

One Time Manual Cropping

The algorithm used requires one line of handwritten digits at a time thus once the image was captured using the camera it was loaded into matlab using the uigetfile –(fancy gui to get filepath and filename) and Imread- (use filepath/filename to load in actual image into matlab workspace) commands. To finish off this step use the imcrop() command to manually crop one line of digits from the image with final product below. Note: this is the only time that there is manually cropping of the image from here on we complete the process algorithmically. Please see improvements on how we could of taken out all manual cropping entirely.

Figure 2: Photographed and manually cropped image of digits.
Figure 2 (original.jpg)

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Definition of a lens

Lenses

A lens is a custom view of the content in the repository. You can think of it as a fancy kind of list that will let you see content through the eyes of organizations and people you trust.

What is in a lens?

Lens makers point to materials (modules and collections), creating a guide that includes their own comments and descriptive tags about the content.

Who can create a lens?

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What are tags? tag icon

Tags are descriptors added by lens makers to help label content, attaching a vocabulary that is meaningful in the context of the lens.

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| A lens I own (?)

Definition of a lens

Lenses

A lens is a custom view of the content in the repository. You can think of it as a fancy kind of list that will let you see content through the eyes of organizations and people you trust.

What is in a lens?

Lens makers point to materials (modules and collections), creating a guide that includes their own comments and descriptive tags about the content.

Who can create a lens?

Any individual member, a community, or a respected organization.

What are tags? tag icon

Tags are descriptors added by lens makers to help label content, attaching a vocabulary that is meaningful in the context of the lens.

| External bookmarks