User manual

ARECONT VISION USER MANUAL 53

Arecont Vision 425 E Colorado St, 7

Floor Glendale, CA 91205 8/1/2012

www.arecontvision.com

HTTP Request Format for Receiving Individual JPEG Frames

NOTE: A complete set of http requests described in this document is supported for firmware versions 61430 and above.

If you have an Arecont Vision camera with a lower firmware version contact your distributor for a firmware upgrade.

An individual image can be requested from Arecont Vision cameras by using the following HTTP request

format:

http://ip_address/image?res=resolution_value&x0=X0&y0=Y0&x1=X1&y1=Y1&quality=quality_value&

doublescan=doublescan_value&id=value

where

 Res can have value of either “half” or “full” and specifies whether camera should decimate the image

by a factor of 2 in each direction or display the full resolution.

 X0, Y0, X1, Y1 are the left, top, right and bottom coordinates of the requested image window,

respectively. These values cannot exceed the size of the image sensor array for the specific camera

and should be divisible by 16 if “Res=full” and 32 if “Res=half”. These parameters allow for a

particular image to be cropped to a selected size.

 Quality is the compressed JPEG image quality with a range from 1 to 20.

 Doublescan

allows the user to specify whether the camera should delay the image output until a new

image is available (doublescan = 0) or the image request should be serviced by outputting the

content of the image buffer that was already once output (useful for picture-in-picture display).

 ID is an optional field that is ignored by the camera but may be set by the user to a random value to

force some browsers to display a new image. Some browsers may display a cached image if a

previous URL is reused without modifying the ID field.



The following example illustrates the request to camera with IP address 192.168.0.36 for a new full resolution

1600x1200 image with compression quality 12:

http://192.168.0.36/image?res=full&x0=0&y0=0&x1=1600&y1=1200&quality=12&doublescan=0

The user also has the option of specifying default image parameters via parameter “set” requests and then

obtaining the image by using a simple request without additional parameters: http://ip_address/img.jpg