XC-77 (EIA), XC-77CE (CCIR)

Monochrome machine vision video camera modules.

2. Main features

Internal/External synchronization

Except the internal sync (provided by internal electronics), the camera can accept external sync information as well. Three types of sync signals are possible:

HD/VD (horizontal drive/vertical drive) signals

The camera determines whether to operate in interlaced or noninterlaced modes from the phase relation between HD and VD (see Scanning system).

VBS (composite video signal)

The camera is synchronized by supplying a composite video signal (for example from another image sensor).

SYNC (composite sync signal)

Synchronization is performed by means of composite sync input signal.

The unit switches automatically between all sync types mentioned above. If no sync signal is input, it operates with internal sync and 2:1 interlace mode.

Restart Reset function

The Restart Reset function enables to start new image integration at any time (specified by external trigger pulse). While HD signal must be supplied all the time, V reset pulses are generated from the trigger signal. Meaningful video signal (being stored after the trigger) is output since the second (in the field integration mode) or the third (in the frame integration mode) field.

The other kind of the restart reset function (which requires further internal setting in the camera) assures the slow speed shutter operation. The image data, integrated since the first reset input signal, is taken out as video signal after the second reset. This is used for capturing dark objects.

Scanning system (interlaced/noninterlaced)

The camera can operate either in interlaced or noninterlaced mode (depending on phase relation between HD and VD pulses).

Interlace mode

Full frame image is split into two fields: odd (lines 1-3-5...) and even (2-4-6...). It enables higher image resolution, but two steps (2 · 1/60 = 1/30 sec for EIA or 2 · 1/50 = 1/25 sec for CCIR) are necessary to read out full frame data. Period of VD signal is V = (A + 1/2)H in this mode, A is an integer.

Noninterlace mode

The camera reads just the odd lines (1-3-5...). That's why full frame data is output every 1/60 or 1/50 sec, however the resolution is half when compared to the interlace mode. Period of VD signal is V = (A)H, A is an integer.

Integration modes

The charge accumulated in the CCD can be presented as output on two different ways.

Field integration mode

The data of any line in the output is a result of mixture of two adjacent lines - in the odd field charge from lines 1 and 2 is mixed and output as line 1, data from lines 3 and 4 becomes line number 3 in output and so on (in the even field lines 2 and 3 are mixed and read out as line 2). This method minimizes motion blur when shooting a moving target. The disadvantage lies in lower vertical resolution.

Frame integration mode

The data for every output line is read out from a single line in the CCD chip. This results in a higher vertical resolution, however when shooting fast moving objects the two fields (odd and even) of an image are shifted each other and the image quality is degraded.

Note: The differences between field and frame integration were explained for the case of an interlaced image scanning. The situation is similar for noninterlaced images.

Square pixels

The XC-77CE (not XC-77) employs a square pixel CCD (cell size 11×11 µm). The square pixels are needed in image processing systems and accurate measuring tasks, because the aspect ratio (the ratio width/height of an image) doesn't require adjustment. Picture elements are equally arrayed in both directions, and allow easy addressing. In case of rectangular pixels one have to maintain the aspect ratio when measuring objects, because the dimensions of stored frame aren't equal to true dimensions; resolutions along x and y axis aren't the same.

Output

Video signal (1.0 Vp-p/75 ohm), generated by the camera electronics, can be output to one of two available connectors - either to a BNC connector or to a special 12-pin multiconnector. Using this 12-pin connector, internal sync signals of the camera (pixel clock, HD and field index/VD) can be output as well.

The third connector of the camera allows to connect and automatically adjust an auto iris lens.

3. Comprehensive specifications

Note: The following table tries to describe all known features and parameters of the camera. When a times mark (×) is filled in a cell, it means that the camera doesn't employ accordant feature or specifying such parameter doesn't make any sense for this camera type.

4. Complementary and related products

Best suited framegrabbers for use with XC-77/77CE

Leutron Vision offers complete, well-known line of framegrabbers, PicPort^®. The best suited for work with XC-77/77CE are:

PicPort^®-Mono and its variants

Framegrabber for monochrome acquisition (CCIR/EIA/nonstandard), with five sync modes and asynchronous acquisition.

PicPort^®-Stereo and its variants

Fully compatible board with PicPort^®-Mono, but with second digitizing channel allowing simultaneous acquisition from two synchronized cameras or from.

Correspondent cables

Please choose all the necessary cables for connecting the camera to a framegrabber.

Camera accessories

Leutron Vision also provides a range of lenses and illumination products, as well as other camera accessories.

Related cameras

LV-75/75CE

Higher model. Various shutter modes, restart reset capability, improved sensitivity.

5. Ordering information

This camera type is already not available to order.