事情是这样的，我准备在android上调用百度的ai接口，使用volley一直穿不上图片，用其他post方法也不对。哪位有经验的大佬帮我看看啊：

String accessToken = result.getString("access_token");
// 拿到accesstoken再进行下一步操作
DebugHelper.LogMessage(accessToken, "拿到了accesstoken");
comeInApiUrl = comeInApiUrl + "?access_token=" + accessToken;
// 把image base64编码post上去
DebugHelper.LogMessage(comeInApiUrl, "final api url");
// 开始post数据上去
imgBase64String = Base64.encodeToString(picture, Base64.DEFAULT);
// postImageThread.start();

RequestQueue requestQueue = Volley.newRequestQueue(CameraActivity.this);
JSONObject params = new JSONObject();
// test= bitmaptoString(BitmapFactory.decodeResource(getResources(), R.drawable.img_2));
params.put("image", imgBase64String);
params.put("with_face", 1);
JsonObjectRequest jsonObjectRequest = new JsonObjectRequest(Request.Method.POST, comeInApiUrl,params,
new Response.Listener() {
@Override
public void onResponse(JSONObject response) {
DebugHelper.LogMessage(response.toString(), "返回结果");

msg.what = 0;
callAPIHandler.sendMessage(msg);

}
},
new Response.ErrorListener() {
@Override
public void onErrorResponse(VolleyError error) {
msg.what = 4;
callAPIHandler.sendMessage(msg);

}
}
){
@Override
protected Map getParams() {
HashMap params = new HashMap();
params.put("image", imgBase64String);
return params;
}
};
requestQueue.add(jsonObjectRequest);
我想说一下，这里一直是返回：

{"log_id":5174076073577850587,"error_code":216101,"error_msg":"param image not exist"}

我表示很蛋疼啊，哪位大佬帮我看看？？